JP2006352451A - Image processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processor capable of efficiently processing an image by enlarging the column direction width of image data to be input to a compression processing part. <P>SOLUTION: The column direction width of the image data to be input to the compression processing part 108 is made to be the integral multiple of an MCU. A JPEG core 202 in the compression processing part 108 applies JPEG compression to the image data by each input compression unit. An encoding counter 203 counts the encoding amount of the compression image data at every row, which is obtained by performing compression by each compression unit. A rearranging part 204 rearranges the compression image data which are obtained by performing compression by each compression unit so as to store the rearranged data in areas different from areas where the image data by compression unit are stored in a storage device 105. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image processing apparatus, and more particularly to an image processing apparatus capable of performing compression processing of image data.

  In the image processing apparatus, as a technique for reducing the data transfer amount of the bus and the memory capacity, a technique that enables pipeline processing of a plurality of image processes including an enlargement / reduction process is proposed in Patent Document 1. Yes. In the technique disclosed in Patent Document 1, an image processing apparatus is configured so that a plurality of image processing units and subsequent compression processing units are directly connected via a buffer. Interpolation pixel data necessary for image processing and data having column direction data for MCU (Minimum Coded Unit) which is the minimum unit necessary for compression processing are input together. Here, the MCU is data composed of, for example, data of 8 pixels × 8 pixels or 16 pixels × 16 pixels.

In Patent Document 1, it is not necessary to transfer processing data to a storage device such as an SDRAM in the processing from the image processing unit to the compression processing unit, so that the data transfer amount of the bus can be reduced.
JP 2000-311241 A

  In the method of Patent Document 1, the width in the column direction of data input to the compression processing unit after image processing is necessarily limited to one MCU. Here, the number of interpolation pixels tends to increase due to the recent advancement of image processing technology. On the other hand, since the number of interpolated pixels does not depend on the data width after processing, increasing the width in the column direction of input data when performing compression processing leads to higher efficiency of image processing.

  The present invention has been made in view of the above circumstances, and provides an image processing apparatus capable of performing more efficient image processing by increasing the column-direction width of image data that can be input to a compression processing unit. Objective.

  In order to achieve the above object, an image processing apparatus according to a first aspect of the present invention includes a plurality of serially connected image processing units for performing spatial image processing on supplied image data. The image data processed by the image processing unit is arranged in units of blocks corresponding to the length of the scanning line so that the number of input pixels in the column direction is N times the minimum unit of compression processing. An image compression unit that sequentially inputs one block line and sequentially compresses the input block unit image data to obtain block unit compressed image data for one block line, and is obtained by the image compression unit. A storage unit having a storage area in which compressed image data in units of one block line is written, and a block of one block line written in the storage area of the storage unit. The compressed image data of the unit is sequentially read out, the arrangement order of the data is changed, and the compressed image data of the block unit for one block line whose arrangement order is changed is converted into the compressed image before the arrangement order of the storage unit is changed. A rearrangement unit that sequentially writes data in a storage area different from the storage area in which data is written is provided.

  According to the first aspect, the column direction width of the image data that can be input to the compression processing unit can be increased, and accordingly, the column direction width of the image data that can be input to the image processing unit can also be increased. . In addition, by increasing the column direction width of image data that can be input to the compression processing unit, compression processing is performed in an order that is not suitable for later reproduction, but this may be rearranged in an order that is suitable for later reproduction. it can.

  ADVANTAGE OF THE INVENTION According to this invention, the image processing apparatus which can perform more efficient image processing can be provided by enlarging the column direction width | variety of the image data which can be input into a compression process part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram showing a main configuration of an image processing apparatus according to the first embodiment of the present invention. The image processing apparatus illustrated in FIG. 1 includes an imaging unit 101, a preprocessing unit 102, a DMA 103, a bus 104, a storage device 105, a DMA 106, an image processing unit 107, a compression processing unit 108, and a DMA 109. It is configured. In addition, the image processing unit 107 can perform a plurality of different image processing including spatial image processing such as enlargement / reduction processing (in FIG. 1, the image processing unit A 107a and the image processing unit 107). Part B107b) is connected directly.

  In FIG. 1, an image signal obtained by being imaged by the imaging unit 101 is subjected to predetermined analog processing and digital processing in a preprocessing unit 102. The image data generated by these processes is transferred to the bus 104 via the DMA 103 and written in the storage device 105 configured by SDRAM or the like.

  The image data written in the storage device 105 is input to the image processing unit 107 via the DMA 106. Here, in the first embodiment, the number of input pixels in the column direction is an integer multiple of the minimum unit data (MCU) necessary for the subsequent compression processing (for example, four times here) from the storage device 105 to the image processing unit 107. ) And image data composed of interpolated pixel data for interpolating the pixel data to be deleted in the image processing unit 107 (for such image data, this is referred to as image data for one block line). Entered. In order to input such image data for one block line, the image data stored in the storage device 105 is obtained by adding the interpolation pixel data to the data width four times the MCU in the column direction pixel by pixel. The image data is read by reading the width and repeating this reading for the length of the scanning line in the row direction. By inputting the image data for each unit read in this way to the image processing unit 107, the interpolated pixel data portion is deleted by image processing in the image processing unit A 107a and the image processing unit B 107b, and finally. Only image data for each unit, in which the number of input pixels in the column direction is four times the MCU, is input to the compression processing unit 108. The compression processing unit 108 performs compression processing on the input image data, and then writes the compressed image data obtained thereby to the storage device 105 via the DMA 109.

  Note that the image processing in the image processing unit 107 does not necessarily need to be performed entirely, and can be bypassed so as not to perform unnecessary image processing. In the example of FIG. 1, the processing in the image processing unit B 107b can be bypassed.

  FIG. 2 is a diagram illustrating a configuration of the compression processing unit 108 which is a main part of the image processing apparatus according to the first embodiment of the present invention. 2 includes a JPEG core I / F unit 201, a JPEG core 202, a code counter 203, and a rearrangement unit 204.

  The JPEG core I / F unit 201 is provided with four buffers (BUF-A to BUF-D), and the image data input to the JPEG core I / F unit 201 is the buffers BUF-A to BUF. Stored sequentially in -D. Here, each of the buffers BUF-A to BUF-D has a capacity sufficient to store the image data input to the JPEG core I / F unit 201 by one compression unit. This one compression unit refers to non-compressed image data having the number of pixels in the column direction of 1 MCU and the number of pixels in the row direction being an integer multiple of 1 MCU. A restart marker is added to the end portion of the image data in one compression unit during JPEG compression. Here, the restart marker is data for indicating a delimiter of compression processing. That is, if the restart marker interval is 2, that is, if a restart marker is added every 2 MCUs during compression, one compression unit is image data for 2 MCUs as shown in FIG. If a restart marker is added every 4 MCUs during compression, one compression unit is image data for 4 MCUs as shown in FIG.

  Hereinafter, description will be continued by numbering the compression units in the image data input to the JPEG core I / F unit 201 as shown in FIG. 4, the compression units 1-1, 1-2, 1-3, and 1-4 at the upper left end are input to the JPEG core I / F unit 201 in parallel as shown in FIG. . Here, if the image data consisting of the compression unit image data 1-1, 1-2, 1-3, and 1-4 is referred to as block unit image data, the block unit image data is arranged in the row direction. Data is input for each pixel in the direction indicated by the arrow in FIG. 5, the first 1 MCU image data in the column direction is stored in the buffer BUF-A, and the next 1 MCU image data is stored in the buffer BUF-B. The data is stored in the buffer BUF-C and the buffer BUF-D, and this input operation is repeated until the number of pixels in the row direction reaches the number of pixels in one compression unit. These four compression units are separately stored in the buffers BUF-A to BUF-D as shown in FIG. When image data for one compression unit is stored in each of the buffers BUF-A to BUF-D, first, image data for one compression unit is input from the buffer BUF-A to the JPEG core 202, and thereafter the buffer BUF-B. , Buffer BUF-C, buffer BUF-D and image data for one compression unit are sequentially input to the JPEG core 202. When image data for one compression unit is output from each of the buffers BUF-A to BUF-D, the next four compression units 2-1, 2-2, 2-3, 2-4 are parallelized to the JPEG core I. / F unit 201 is input. Thereafter, similarly, four compression units are input in parallel to the JPEG core I / F unit 201, and four compression units are stored in four buffers and input to the JPEG core 202 as soon as possible. As a result, image data for each compression unit is input to the JPEG core 202 in the order shown in FIG.

  The JPEG core 202 performs JPEG compression processing every time image data for one compression unit is input. Each time image data for one compression unit is compressed, a restart marker is added to generate compressed image data. Here, the restart markers are numbered with 8 modulo. That is, each time compressed image data for one compression unit is generated, restart markers numbered in the order of FFD0, FFD1, FFD2, FFD3, FFD4, FFD5, FFD6, FFD7, FFD0, FFD1,. Added.

  Here, the compressed image data input to the JPEG core 202 and compressed in the order shown in FIG. 7 is written in the storage device 105 in the order shown in FIG. By the way, in the case of decompressing compressed image data in a general image reproducing apparatus, the compressed image data is read out in the row direction. Therefore, even if the compressed image data stored in the order of FIG. 7 is decompressed, the original image shown in FIG. The image cannot be decompressed in the order of images. Therefore, the compressed image data is rearranged using the subsequent code counter 203 and rearrangement unit 204, and then stored in the storage device 105.

  In FIG. 2, the compressed image data generated by the JPEG core 202 is input to the code counter 203. Here, as shown in FIG. 8, the code counter 203 includes a code counter controller 203a and four code counters A to D. The code amount of the compressed image data output from the buffers BUF-A to BUF-D of the JPEG core I / F unit 201 and compressed by the JPEG core 202 in the order shown in FIG. At the same time, a restart marker (portion indicated by RST in the figure) in the compressed image data input by the code counter controller 203a is detected. When the restart counter is detected in the code counter controller 203a, the code amount of the compressed image data for one compression unit is counted. Therefore, the code counter controller 203a issues a counter switching instruction. In response to this, the counter is switched, and then the code amount is counted by the code counter B. Similarly, every time a restart marker is detected, the sign counter controller 203a issues a counter switching instruction.

  The compressed image data for one block line whose code amount is counted by the code counter 203 is written to the storage device 105 via the DMA 109. Thereafter, the rearrangement unit 204 reads compressed image data for one block line from the storage device 105 and rearranges the compressed image data.

  FIG. 9A is a diagram illustrating an internal configuration of the rearrangement unit 204. The rearrangement unit 204 includes a compressed image data reading unit 204a, a restart marker detection unit 204b, a restart marker rewriting unit 204c, a selection unit 204d, and a compressed image data writing unit 204e.

  The compressed image data reading unit 204 a reads compressed image data from the storage device 105 each time compressed image data for one block line is written to the storage device 105. The read compressed image data is input to the restart marker detection unit 204b. The restart marker detection unit 204b detects the restart marker in the compressed image data input from the compressed image data reading unit 204a and counts the number of restart markers.

The restart marker rewriting unit 204c rewrites the marker number of the restart marker detected by the restart marker detection unit 204b. The marker number at the time of rewriting is
Marker number = ((number of compression units in row direction × current compression unit position in row direction) + current compression unit position in column direction)% 8 (Formula 1)
It is determined based on the following formula. Here, the number of compression units in the row direction in (Equation 1) indicates the number of compression units arranged in the row direction. In the example of FIG. The current row direction compression unit position indicates the row direction position (that is, what column) of the compressed image data for each compression unit to be rewritten by the restart marker. For example, the position of the compressed image data obtained by compressing the compression unit 1-1 (hereinafter referred to as compressed image data 1-1. The same applies to other compressed image data) (row, column) = (0, 0), the position of the compressed image data 1-2 in the row direction is 1. Also, the row direction position of the compressed image data 2-1 is zero. Furthermore, the current column direction compression unit position indicates the column direction position (that is, what number line) of the compressed image data for each unit to be rewritten by the restart marker. The position in the column direction of the compressed image data 1-2 is 0. The position in the column direction of the compressed image data 2-1 is 1. In addition, “% 8” in (Expression 1) means that 8 modulo operations are performed.

  For example, when the number of compression units in the row direction is 10 and the restart marker to be rewritten is the compressed image data 1-2, the marker number of the restart marker after rewriting is marker number = ((10 × 1) +0. )% 8 = 2. That is, by performing the rewriting, the marker number of the compressed image data 1-2 in which the original marker number is FFD1 becomes FFD2.

  In the selection unit 204d, either the compressed image data read by the compressed image data reading unit 204a or the restart marker rewritten by the restart marker rewriting unit 204c is selectively output to the compressed image data writing unit 204e. . That is, the selection unit 204d outputs the compressed image data read by the compressed image data reading unit 204a until the restart marker detection unit 204b detects a restart marker, and the restart marker detection unit 204b restarts the restart image. When the marker is detected, the restart marker rewritten by the restart marker rewriting unit 204c is output. As a result, a restart marker whose marker number has been rewritten by the restart marker rewriting unit 204c is added to the end of the compressed image data for each compression unit.

  In the compressed image data writing unit 204e, the compressed image data for each compression unit in which the restart marker is rewritten is written as the compressed image data before the rearrangement of the storage device 105 as shown in FIG. 9A. It is written in a storage area different from the storage area. At this time, the compressed image data writing unit 204e generates a write destination address of the compressed image data based on the code amount counted by the code counter 203.

  FIG. 10 is a diagram showing the concept of generating the write destination address of the compressed image data at the time of such rearrangement. First, the write destination address of the compressed image data 1-1 is the start address of the other storage area. The address to which the compressed image data 1-2 to be input next is written is generated by adding the code amount counted by the code counter A to the head address of the other storage area. The address to which the compressed image data 1-3 to be input next is written is generated by adding the code amount counted by the code counter C to the address to which the compressed image data 1-2 is written. The write destination address of the compressed image data 1-4 to be input next is generated by adding the code amount counted by the code counter D to the write destination address of the compressed image data 1-3.

  The next input compressed image data 2-1 is compressed image data input from the BUF-A system. For this reason, the compressed image data 2-1 is continuously written in the restart marker of the compressed image data 1-1. The next compressed image data 2-2 is the restart marker of the compressed image data 1-2, the compressed image data 2-3 is the restart marker of the compressed image data 1-3, and the compressed image data 2-4 is the compressed image data. It is continuously written to the restart marker of 1-4, and the subsequent compressed image data is similarly written.

  By performing such rearrangement of the compressed image data, in the storage device 105, the BUF-B continues to the restart marker of the compressed image data h-1, which is the last compressed image data of the BUF-A system. Compressed image data 1-2, which is the first compressed image data of the system, is stored, and the BUF-C continues to the restart marker of the compressed image data h-2, which is the last compressed image data of the BUF-B system. Compressed image data 1-3, which is the first compressed image data of the system, is stored, and the BUF-D is consecutively connected to the restart marker of the compressed image data h-3, which is the last compressed image data of the BUF-C system. The compressed image data 1-4, which is the first compressed image data of the system, is stored.

  In the example of FIG. 9A, the compressed image data for each compression unit subjected to the rearrangement is stored in the storage device 105. However, as shown in FIG. May be recorded on another external medium 110. For example, a memory card or a hard disk is used as the external medium 110.

  Such a process is repeated until restart markers for one block line are counted in the restart marker detection unit 204b. When the restart marker for one block line is counted, a restart stop instruction is given from the restart marker detection unit 204b to the compressed image data reading unit 204a, and the reading in the compressed image data reading unit 204a is temporarily terminated. .

  Thereafter, the processing moves to the next block line, and such processing is repeated until the end of all the block lines, that is, until the processing for one frame is completed.

  Next, the effect of 1st Embodiment is demonstrated with reference to Fig.11 (a) and FIG.11 (b). As described above, in the image processing unit A 107a and the image processing unit B 107b, the interpolation pixel data portion is deleted by image processing. In general image processing, interpolation is performed as shown in FIGS. 11A and 11B when image data for one block line is read from the storage device 105 so that the portion to be cut can be reduced as much as possible. Pixel data is read so as to overlap. If such reading is performed, only the upper and lower ends of the image data stored in the storage device 105 are finally cut as interpolation pixel data. The interpolated pixel data deleted at this time does not depend on the width of the processed image data. Actually, the left end and the right end in the image data are also removed, but these influences are negligible.

  Here, when the number of input pixels in the column direction that can be input to the image processing unit 107 with a single input is small, as shown in FIG. The number of times the image data for the block line is input also increases. In this case, the amount of interpolation pixel data that must be read redundantly increases, the total amount of data input to the image processing unit 107 increases, and image processing efficiency decreases.

  On the other hand, in the first embodiment, by allowing image data of a plurality of compression units to be input to the compression processing unit 108, one block line input to the image processing unit 107 as shown in FIG. The width in the column direction of the image data can be increased. As a result, it is possible to reduce the amount of interpolation pixel data that must be read redundantly, reduce the total amount of input data, and improve the efficiency of image processing.

  In addition, by inputting image data of a plurality of compression units to the compression processing unit 108, image data in the correct arrangement order cannot be restored at the time of decompression at the time of image reproduction. The first embodiment Then, by rearranging the compressed image data obtained for each compression unit during the compression process, the image data in the correct arrangement order is restored at the time of decompression.

[Second Embodiment]
FIG. 12 is a diagram showing the configuration of the compression processing unit in the image processing apparatus according to the second embodiment of the present invention. 12 differs from FIG. 2 in that the code counter 203 is omitted. Along with this, the contents of the sorting process in the sorting unit 204 are different. The other points are the same as in the first embodiment.

  Hereinafter, the rearrangement in the rearrangement unit 204 will be described. In the second embodiment, since there is no code counter 203 and the code amount for each buffer cannot be counted, in the compressed image data reading unit 204a, one block line of compressed image data for each compression unit stored in the storage device 105 is stored. Is read N times (here, 4 times). Then, the compressed image data for one block line is sequentially read out, and the restart marker detecting unit 204b detects the restart marker of the compressed image data in each compression unit. The restart marker detection unit 204b performs an operation of detecting only compressed image data of a compression unit corresponding to image data of a K (1 ≦ K ≦ N) th compression unit from the top of each block. In response to the detection result, the compressed image data writing unit 204e writes only the compressed image data of the compression unit corresponding to the image data of the Kth compression unit from the top to another area of the storage device 105 or the external medium 110. To do. Here, K is increased by 1 for each reading. That is, in addition to the operation in the first embodiment, the restart marker detection unit 204b performs an operation of detecting only the compressed image data of the compression unit corresponding to the image data of the Kth compression unit from the top of each block. . The operations of the restart marker rewriting unit 204c and the selection unit 204d are the same as those in the first embodiment.

  FIG. 13 is a diagram for specifically explaining the rearrangement of the second embodiment. As shown in FIG. 13, in the first reading (K = 1), the image data of the compression unit to be read is 1-1, so that it is detected by the restart marker detecting unit 204b and stored by the compressed image data writing unit 204e. It is written in another area of the device 105 or the external medium 110. The compressed image data 1-2, 1-3, 1-4 of the compression unit that is subsequently read out is not detected and is not written. The compressed image data 2-1 of the compression unit to be read next is detected and written. Similarly, writing up to compressed image data 3-1,..., H-1 in a compression unit is performed. In this way, compressed image data 1-1, 2-1, 3-1, ..., (h-1) corresponding to the first compression unit from the top of the compressed image data for one block line read out in this way. −1, h−1 (that is, the compressed image data of the buffer BUF-A system) is written in another area of the storage device 105 or the external medium 110, and in the other area of the storage device 105 or the external medium 110, the compression unit data. The compressed image data 1-1, 2-1, ..., (h-1) -1, h-1 are arranged in one column in the first row.

In the second reading, the compressed image data 1-2, 2-2, 3-2,..., (H-1) corresponding to the second compression unit from the top of the compressed image data for one block line that has been read. ) -2, h-2 (that is, compressed image data of the system of the buffer BUF-B) is written in another area of the storage device 105 or the external medium 110, and in another area of the storage device 105 or the external medium 110, a compression unit is written. , (H-1) -2, h-2 are arranged in one column in the second row. In the third reading, compressed image data 1-3, 2-3, 3-3,..., (H-1) corresponding to the third compression unit from the top of the compressed image data for one block line that has been read. ) -3, h-3 (that is, the compressed image data of the buffer BUF-C system) is written to another area of the storage device 105 or the external medium 110, and the compression unit is stored in another area of the storage device 105 or the external medium 110. , (H-1) -3, h-3 are arranged in one column in the third row. In the fourth reading, compressed image data 1-4, 2-4, 3-4,... (H-1) corresponding to the fourth compression unit from the top of the compressed image data for one block line that has been read. ) -4, h-4 (that is, the compressed image data of the buffer BUF-D system) is written in another area of the storage device 105 or the external medium 110, and in another area of the storage device 105 or the external medium 110, a compression unit is written. , (H-1) -4, h-4 are arranged in one column in the fourth row.
By performing the above operation, data rearrangement for one block line is completed.

  In the second embodiment as described above, rearrangement can be performed without the code counter 203 counting the code amount.

  Although the present invention has been described based on the above embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention. For example, in each of the above embodiments, the number of input pixels in the column direction of the image data input from the storage device 105 to the image processing unit 107 is described as four times that of the MCU, but this number may be changed. Further, the processing speed may be increased by a so-called butterfly configuration in which each of BUF-A to BUF-D includes two buffers, that is, an input side buffer and an output side buffer.

  Further, the above-described embodiments include various stages of the invention, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

1 is a diagram illustrating a main configuration of an image processing apparatus according to a first embodiment of the present invention. It is the figure shown about the structure of the compression process part which is the principal part of the image processing apparatus which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating a compression unit. It is the figure shown about the image data divided | segmented for every compression unit. It is a figure shown about the input order when the image data of a compression unit is input into an image process part. It is a figure which shows a mode when the image data of a compression unit are stored in buffer BUF-A-BUF-D. It is a figure shown about the input order when the image data for every compression unit is input into a JPEG core. It is a figure for demonstrating a code | symbol counter. It is a figure for demonstrating a rearrangement part. It is a figure shown about the way of thinking of rearrangement in a 1st embodiment. It is a figure for demonstrating the effect of 1st Embodiment. It is the figure shown about the structure of the compression process part which is the principal part of the image processing apparatus which concerns on the 2nd Embodiment of this invention. It is a figure shown about the view of rearrangement in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Imaging part (CCD), 102 ... Pre-processing part, 103, 106, 109 ... DMA, 104 ... Bus, 105 ... Storage device, 107 ... Image processing part, 108 ... Compression processing part, 110 ... External media, 201 ... JPEG core I / F unit, 202... JPEG core, 203... Sign counter, 204.

Claims (8)

A plurality of serially connected image processing units for performing spatial image processing on the supplied image data;
The image data processed by the image processing unit is arranged in units of blocks corresponding to the length of the scanning line so that the number of input pixels in the column direction is N times the minimum unit of compression processing. An image compression unit that sequentially inputs one block line and obtains compressed image data in block units for one block line by sequentially compressing the input block unit image data;
A storage unit having a storage area in which compressed image data for each block line obtained by the image compression unit is written;
The block-unit compressed image data for one block line written in the storage area of the storage unit is sequentially read out, the data arrangement order is changed, and the block-unit compressed image for one block line with the arrangement order changed. A rearrangement unit that sequentially writes data in a storage area different from the storage area in which the compressed image data before the rearrangement of the storage unit is changed;
An image processing apparatus comprising: The block unit image data includes N units of compression unit image data consisting of image data corresponding to the number of pixels that is M times the minimum unit of the compression process in the column direction and M units of the minimum unit of the compression process in the column direction. It is an array of pieces,
The compression processing unit includes a single or a plurality of buffers for storing the block-unit image data,
When obtaining the compressed image data in units of blocks for the one block line, the compression processing unit obtains image data composed of one pixel in the row direction and N pixels as the minimum unit of the compression processing in the column direction. Sequential storage in the buffer is repeated in the row direction, and N pieces of compression unit image data for each block unit are stored in the buffer, and N pieces of compression unit image data for each stored block unit are stored. Each time compression processing is performed sequentially from the image data of the first compression unit in the column direction, and the compression processing of the image data of one compression unit is completed, the image data of the compression unit is added to the compressed image data. The compressed marker data for each block unit is obtained by adding a restart marker indicating that the compression processing has been completed, and the compressed image data of the obtained compression unit for each block unit is obtained. The image processing apparatus according to claim 1, characterized in that writes into the sequential one block line the storage unit the data.   The rearrangement unit changes the arrangement order of the data for all the block lines constituting the frame, and changes the arrangement order of the compressed image data of each block line in which the arrangement order is changed. When sequentially writing to a storage area different from the storage area in which the compressed image data before writing is written, each write destination address of the compressed image data in the compression unit is generated, and the arrangement is performed at the generated address. The image processing apparatus according to claim 2, wherein the compressed image data for each compression unit whose order has been changed is sequentially written. Of the compressed image data in the compression unit for each block obtained in the compression processing unit, corresponds to the image data in the K (1 ≦ K ≦ N) th compression unit from the top of the compression unit image data in each block. Further comprising N code counters for counting the code amount of only compressed image data for each compression unit for all blocks,
The reordering unit uses the address of the compressed image data of the first compression unit from the top in the first block as the start address of the other storage area, and the second and subsequent compression units from the top in the first block. A code counter that counts the code amount of all blocks of the compressed image data for each one compression unit to the write destination address of the compressed image data of the compression unit that is one higher than the write destination address of the compressed image data The address of the compressed image data in each compression unit in the second and subsequent blocks is written to the address of the compressed image data in the corresponding compression unit in the previous block. By generating the data so as to be continuous with the start marker, each of the compressed image data in the compression unit is written. The image processing apparatus according to claim 3, characterized in that to produce only the previous address.   The rearrangement unit changes the arrangement order of the data for all the block lines constituting the frame, and changes the arrangement order of the compressed image data of each block line in which the arrangement order is changed. When sequentially writing to a storage area different from the storage area where the compressed image data before writing is written, the compressed image data of the compression unit for one block line before changing the arrangement order is read and the read By detecting the restart marker of the compressed image data in the compression unit for one block line, the image data in the K (1 ≦ K ≦ N) th compression unit from the top among the compression unit image data for each block. Compressed image data for each corresponding compression unit is stored in another storage area of the storage unit, and the compression for one block line is performed while increasing the value of K by one. The image processing apparatus according to claim 2, characterized in that to change the order of the data by repeating N times the input and storage of compressed image data for each of the units of the image data.   The rearrangement unit sequentially stores the compressed image data of each block line whose arrangement order has been changed in a storage area different from the storage area in which the compressed image data before the arrangement order is changed is written in the storage unit. 3. The image processing apparatus according to claim 2, wherein a restart marker is rewritten for each piece of compressed image data in the compression unit when writing.   The other storage area is a storage area provided in the storage unit separately from a storage area in which compressed image data before changing the arrangement order of the data is written. 6. The image processing apparatus according to any one of 6.   The image processing apparatus according to claim 1, wherein the another storage area is a storage area in a storage device provided separately from the storage unit.

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