JP2006121568A - Image processor and image processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processor and an image processing method for improving the picture quality of a progressive image after IP conversion. <P>SOLUTION: This image processor 1 is provided with: moving section detecting means 2a, 2b and 2c for detecting the moving sections of pixels; an MPEG2-MPÐML detecting means 3 for performing MPEG2-MPÐML detection for a line where the data of an interlace video signal do not exist and a line where only half of the information quantity of a vertical direction unique to the MPEG2-MPÐML system exists; and an interpolation processing means 4 for operating interpolation processing while referring to the image data of a luminance signal Y according to the detection result of the moving section detecting means at the time of interpolating chroma signals Cr and Cb. The signal of the MPEG2-MPÐML system is converted into a progressive video signal based on the interpolation data prepared from the detection result of the MPEG2-MPÐML detecting means 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes liquid crystal, PDP (Plasma Display Panel), PALC (Plasma Addressed Liquid Crystal) display panel, organic EL (Electro Luminescence), CRT (Cathode Ray Tube), etc .; When displaying a progressive scan compatible television receiver (hereinafter referred to as a TV) or a MPEG2-MP @ ML format signal such as a DVD on a monitor, this method is detected and the chroma signal is processed in luminance. The present invention relates to an image processing apparatus and an image processing method including an IP conversion circuit that changes an interpolation method according to image information of a signal.

  In recent years, the flooding of the source of the MPEG2 (Moving Picture Experts Group) -MP @ ML (Main Profile at Main Level) system signal has progressed in the progressive scan of TV, DVD (Digital Versatile Disc), digital broadcasting, and the like.

FIG. 5 is an explanatory diagram showing an example of an ITU-R601 format and an MPEG2-MP @ ML format.
In FIG. 5, the horizontal axis represents the number of pixels in the horizontal direction, and the vertical axis represents the number of scanning lines.
When converting the format from an analog signal to a digital signal, the sampling frequency of the luminance signal Y is 13.5 MHz, and the sampling frequencies of the two types of chroma signals Cb and Cr are half of 6.75 MHz.
The ITU-R601 format shown in FIG. 5 is called a 4: 2: 2 format by taking a proportional value of the information amount.

However, since the 4: 2: 2 format has a large amount of data and requires a large capacity of a recording medium such as a DVD and a transmission band, the recognition rate of changes in chroma signals is lower than the recognition rate of changes in luminance signals. In consideration of the characteristics of human eyes, the MPEG2-MP @ ML format defines the 4: 2: 0 format as shown in FIG.
In this method, Cb and Cr of the chroma signal in the vertical direction are captured, the chroma signal Cb is captured on the first line, and the chroma signal Cr is captured on the next line. As a result, Y (luminance signal): Cb (chroma) Signal): Cr (chroma signal) ratio is 4: 2: 0 on the first line and 4: 0: 2 on the second line, which is generally expressed as 4: 2: 0 format.

FIG. 6 is an explanatory diagram showing the output of a normal MPEG2 encoder.
On the other hand, an MPEG2 decoder chip mounted on a DVD player or digital broadcast STB (Set Top Box) writes the missing chroma signals Cb and Cr twice in the vertical direction as shown in FIG. ) Is generally used for output.

  Conventionally, an image in which motion part detection is performed, interpolation pixel calculation is performed on a line where no interlace video signal data exists, and interpolation data is generated, and the interlace video signal is converted into a progressive video signal based on the interpolation data. A processing apparatus is disclosed in Patent Document 1.

The image processing apparatus disclosed in Patent Document 1 calculates a data difference between fields based on current field data and a plurality of field delay data, and a portion larger than a preset threshold value for each data difference value And a logical sum of the obtained flag data is used for the motion part detection.
JP 2002-185933 A

FIG. 7 is an explanatory diagram showing an output of a normal MPEG2 encoder, and FIG. 8 is an explanatory diagram showing an output subjected to IP conversion by a conventional technique.
When the output is subjected to IP conversion processing in the still image area, as shown in FIGS. 7 and 8, the chroma signal Cb is line-inverted in the vertical direction, and a video signal different from the original image is displayed and the image quality deteriorates. Cause.

FIG. 9 is an explanatory diagram showing an output IP-converted by a conventional technique.
On the other hand, using the fact that the human eye is less sensitive to the chroma signal Cb than the luminance signal Y, as shown in FIG. 9, the interpolation method of the chroma signal Cb may be interpolated and output. However, since the diagonal line jaggy and the video components in the time axis direction are different, flicker occurs, which causes image quality deterioration.

  Therefore, the present invention has been made in view of the above problems, and when IP conversion is performed on a signal recorded in the MPEG2-MP @ ML format, the interpolation image quality of the chroma signal can be improved, and MPEG2-MP @ ML Image processing apparatus and image processing method capable of reducing annoying image degradation of chroma signals when IP signals are converted to IP signals, performing display faithful to original images, and improving the quality of progressive images after IP conversion The purpose is to provide.

In order to solve the above problems, the present invention has the following configuration.
An image processing apparatus according to the present invention includes a motion part detecting unit that detects a motion part of a corresponding pixel, and is an image processing apparatus that performs processing for converting an MPEG2-MP @ ML format signal into a progressive video signal. MPEG2-MP @ ML detection means for detecting MPEG2-MP @ ML for a line where no data exists and a line having only half the amount of vertical information unique to the MPEG2-MP @ ML method, and interpolation of two types of chroma signals And interpolating processing means for performing interpolation processing while referring to the image data of the luminance signal according to the detection result of the motion part detecting means, and performing interpolation pixel calculation according to the detection result of the MPEG2-MP @ ML detecting means. Interpolation method is changed, interpolation data is created, and the MPEG2-MP based on the created interpolation data It employs the structure and converting the signals ML scheme progressive video signal.

  According to the present invention described above, it is possible to perform IP conversion of an MPEG2-MP @ ML format signal faithfully to an original image and without image quality degradation by the motion part detection means and the MPEG2-MP @ ML detection means.

  In the image processing apparatus of the present invention, the interpolation processing means calculates at least one of the difference data between even fields or between odd fields, and uses the calculated difference data for the motion portion detection.

  According to the present invention described above, by using not only the difference data between even fields but also the difference data between odd fields, the detection sensitivity can be increased even for a small range of movement between the scanning lines. it can.

  In the image processing apparatus of the present invention, the interpolation processing means performs video determination of the two types of chroma signals, and the MPEG2-MP @ ML detection means detects MP @ ML of the 4: 2: 0 signal of the MPEG2 signal. And a first interpolation processing change means for changing the interpolation processing according to the detection result of the MPEG2-MP @ ML detection means.

  According to the present invention described above, the interpolation process can be changed according to the detection result of the MPEG2-MP @ ML detection means.

  In the image processing apparatus of the present invention, the interpolation processing means changes the detection threshold of the MPEG2-MP @ ML detection means for performing the MPEG2-MP @ ML detection according to the type of signal source.

  According to the present invention described above, the detection threshold of the MPEG2-MP @ ML detection means for performing MPEG2-MP @ ML detection can be changed depending on the type of signal source.

  The image processing apparatus of the present invention includes a second interpolation processing change unit that changes the interpolation processing according to the information of the reference data when the two types of chroma signals are interpolated by the information of the image data of the luminance signal. Yes.

  According to the present invention described above, when the two types of chroma signals are interpolated by the information of the image data of the luminance signal, the interpolation process can be changed according to the information of the reference data.

  In the image processing apparatus of the present invention, the second interpolation process changing unit changes the threshold value of the interpolation process according to the information of the reference data.

  According to the present invention described above, the threshold value for the interpolation process can be changed according to the information of the reference data.

  In the image processing apparatus of the present invention, the two types of chroma signals have independent threshold values.

  According to the present invention described above, two types of chroma signals can have independent threshold values.

  An image processing method of the present invention includes a motion part detection process for detecting a motion part of a corresponding pixel, and an image processing method for performing a process of converting an MPEG2-MP @ ML format signal into a progressive video signal. MPEG2-MP @ ML detection processing that performs MPEG2-MP @ ML detection for lines that do not have data and lines that have only half the amount of vertical information unique to the MPEG2-MP @ ML method, and interpolates two types of chroma signals An interpolation process for performing an interpolation process while referring to the image data of the luminance signal in accordance with the detection result of the motion part detection means, and interpolating the interpolation pixel calculation based on the detection result of the MPEG2-MP @ ML detection means. The method is changed, interpolation data is created, and the MPEG2-MP @ M based on the created interpolation data It is characterized in that for converting a signal scheme progressive video signal.

  According to the present invention described above, it is possible to perform IP conversion that is faithful to an original image and has no image quality deterioration by using a motion part detection process and an MPEG2-MP @ ML detection process for an MPEG2-MP @ ML signal.

  As described above, according to the present invention, when the signal recorded in the MPEG2-MP @ ML system is IP-converted, the interpolation image quality of the chroma signal can be improved, and the signal of the MPEG2-MP @ ML system can be improved. An image processing apparatus and an image processing method capable of reducing an annoying image degradation of a chroma signal when IP is converted to IP, displaying an original image faithfully, and improving the quality of a progressive image after IP conversion Can do.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  The image processing apparatus 1 of the present invention includes a Y (luminance signal) motion part detection means 2a, Cr (chroma signal) motion part detection means 2b, and Cb (chroma signal), which are motion part detection means for detecting a motion part of the corresponding pixel. The moving part detecting means 2c is provided to perform processing for converting an MPEG2-MP @ ML format signal into a progressive video signal.

  The image processing apparatus 1 according to the present invention performs MPEG2-MP @ ML detection for MPEG2-MP @ ML detection on a line in which no interlaced video signal data exists and a line having only half the amount of vertical information peculiar to the MPEG2-MP @ ML method. When the @ML detection means 3 and the two types of chroma signals Cr and Cb are interpolated, the luminance signal Y of the Y motion portion detection means 2a, the Cr motion portion detection means 2b, and the Cb motion portion detection means 2c is detected. And interpolation processing means 4 that performs interpolation processing while referring to image data, and changes the interpolation method of interpolation pixel calculation according to the detection result of MPEG2-MP @ ML detection means 3, creates interpolation data, and creates the created interpolation data Based on the above, the MPEG2-MP @ ML format signal is converted into a progressive video signal.

  In the image processing apparatus 1 of the present invention, the interpolation processing means 4 calculates at least one of the difference data between even fields or between odd fields, and uses the calculated difference data for motion part detection.

  In the image processing apparatus 1 of the present invention, the interpolation processing unit 4 performs video determination of two types of chroma signals Cr and Cb, and the MPEG2-MP @ ML detection unit 3 performs MP2 of the 4: 2: 0 signal of the MPEG2 signal. A first interpolation process changing unit is provided for performing @ML detection and changing the interpolation process according to the detection result of the MPEG2-MP @ ML detection unit 3.

  In the image processing apparatus 1 of the present invention, the interpolation processing means 4 changes the detection threshold of the MPEG2-MP @ ML detection means 3 that performs MPEG2-MP @ ML detection according to the type of signal source.

  The image processing apparatus 1 according to the present invention, when interpolating the two types of chroma signals Cr and Cb based on the information of the image data of the luminance signal Y, second interpolation processing change means for changing the interpolation processing according to the information of the reference data. It has.

  In the image processing apparatus 1 according to the present invention, the second interpolation processing change unit changes the threshold value of the interpolation processing according to the information of the reference data.

  In the image processing apparatus 1 of the present invention, the two types of chroma signals Cr and Cb have independent threshold values.

  The image processing method of the present invention includes a Y (luminance signal) motion part detection process, a Cr (chroma signal) motion part detection process, and a Cb (chroma signal) motion part detection which are motion part detection processes for detecting a motion part of a corresponding pixel. Including a process, a process of converting an MPEG2-MP @ ML format signal into a progressive video signal is performed.

  According to the image processing method of the present invention, MPEG2-MP @ ML detection is performed on a line where no interlaced video signal data exists and a line whose information amount in the vertical direction, which is peculiar to the MPEG2-MP @ ML method, is only half. When the ML detection process and the two types of chroma signals Cr and Cb are interpolated, the image data of the luminance signal Y is referred to according to the detection results of the Y motion part detection process, the Cr motion part detection process, and the Cb motion part detection process. Interpolation processing for performing interpolation processing while changing the interpolation method of the interpolation pixel calculation according to the detection result of the MPEG2-MP @ ML detection processing, creating interpolation data, and MPEG2-MP @ ML based on the created interpolation data The system signal is converted to a progressive video signal.

FIG. 1 is a block diagram illustrating a circuit configuration of an image processing apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the image processing apparatus 1 includes a Y (luminance signal) motion part detecting means 2a for detecting a motion part of the luminance signal Y input from the input terminal Iy, and a chroma input from the input terminal Icr. A Cr (chroma signal) motion part detection means 2b for detecting a motion part of the signal Cr; a Cb (chroma signal) motion part detection means 2c for detecting a motion part of the chroma signal Cb input from the input terminal Icb; The IP conversion circuit 5a that performs IP conversion of the luminance signal Y, the IP conversion circuit 5b that performs IP conversion of the chroma signal Cr, the IP conversion circuit 5c that performs IP conversion of the chroma signal Cb, and the luminance signal Y are delayed in units of fields. A field memory 6a which is a Y (luminance signal) delay means to be performed, and a field memory which is a Cr (chroma signal) delay means which delays the chroma signal Cr in a field unit. And Li 6b, and is configured chroma signals Cb and the field memories 6c is a Cb (chroma signal) delay means for delaying a field basis, from MPEG2-MP @ ML detector 3 for performing MPEG2-MP @ ML detection.

  The interpolation processing means 4 of the image processing apparatus 1 includes field memories 6a, 6b, 6c and IP conversion circuits 5a, 5b, 5c.

  The Y (luminance signal) motion part detection means 2a, the Cr (chroma signal) motion part detection means 2b, and the Cb (chroma signal) motion part detection means 2c detect the motion part of the corresponding pixel, and the MPEG2-MP @ ML detection means 3 MPEG2-MP @ ML detection is performed on a line in which no interlace video signal data exists and a line having only half the amount of information in the vertical direction, which is peculiar to the MPEG2-MP @ ML method. An image for changing the interpolation method of the IP conversion circuits 5b and 5c serving as the interpolation pixel calculation means according to the result, creating interpolation data, and converting an MPEG2-MP @ ML system signal into a progressive video signal based on the created interpolation data When the chroma signal Cr, Cb is interpolated in the processing device 1, the interpolation processing means 4 is replaced with the Y motion part detecting means 2 Performs interpolation processing while referring to the image data of the luminance signal Y by Cr moving portion detecting means 2b, the result of the moving portion detecting Cb moving portion detecting means 2c.

FIG. 2 is a block diagram showing a detailed circuit configuration for explaining the image processing apparatus according to the embodiment of the present invention.
An embodiment of the image processing apparatus according to the present invention will be described below with reference to FIG.
The chroma signal Cr and chroma signal Cb are referred to as chroma signal C in FIG.

The chroma signal C input from the input terminal Ic is input to the MPEG2-MP @ ML detection means 3.
The MPEG2-MP @ ML detection means 3 compares the odd lines and the even lines in the same field, and acquires the difference number information.
When the acquired difference number information is equal to or less than an arbitrary threshold value, the MPEG2-MP @ ML detection unit 3 determines that the input signal belongs to the corresponding format, and sends it to the IP conversion circuits 5b and 5c that perform IP conversion of the chroma signal C. The control signal 100 is transmitted.

Further, the chroma signal C is input to the chroma signal motion portion detection means 2b and c.
The chroma signal motion part detection means 2b, c for detecting the motion part of the chroma signal C is arbitrarily compared with the field video signal delayed by any field by the field memories 6b, c that delay the chroma signal C in the field unit. If the threshold value is equal to or less than the threshold value, the chroma signal motion portion detection means 2b, c determines that the corresponding signal portion is a still image region, and transmits the control signal 101 to the IP conversion circuits 5b, c that perform IP conversion of the chroma signal C. Let

On the other hand, for the luminance signal Y input from the input terminal Iy, the luminance signal Y is similarly input to the Y (luminance signal) motion part detecting means 2a.
The Y motion part detecting means 2a for detecting the motion part of the luminance signal Y is compared with a field video signal delayed by an arbitrary field by a field memory 6a that delays the luminance signal Y in a field unit, and is below an arbitrary threshold value. The Y movement portion detection means 2a determines that the corresponding signal portion is a still image region, and transmits the control signal 102 to the IP conversion circuits 5b and 5c that perform IP conversion of the chroma signal C.

FIG. 3 is an explanatory diagram showing an output processed by the image processing apparatus according to the embodiment of the present invention.
The IP conversion circuits 5b and 5c that perform the IP conversion of the chroma signal C are determined as the MPEG2-MP @ ML signal by the control signal 100, and the control signal 102 and the chroma signal motion, which are the detection results of the Y motion portion detection means 2a. When both control signals 101, which are detection results of the partial detection means 2b and c, make a still image determination, the IP conversion circuits 5b and 5c discard even lines for each field as shown in FIG. The chroma signal Cr discards odd lines and creates a pixel based on an arbitrary coefficient based on the peripheral pixel line and the luminance signal Y of the corresponding pixel for each pixel of the corresponding line.

FIG. 4 is an explanatory diagram showing the final output processed by the image processing apparatus according to the embodiment of the present invention.
IP conversion is performed from the even and odd fields subjected to the above processing, and a progressive output of the chroma signal Cb as shown in FIG. 4 is obtained.
The progressive output of the obtained chroma signal Cb can obtain the same output result as the original picture image shown in FIG.

1 is a block diagram showing a circuit configuration of an image processing apparatus according to an embodiment of the present invention. 1 is a block diagram showing a detailed circuit configuration for explaining an image processing apparatus according to an embodiment of the present invention. Explanatory drawing which shows the output processed with the image processing apparatus which concerns on the Example of this invention. Explanatory drawing which shows the final output processed with the image processing apparatus which concerns on the Example of this invention. Explanatory drawing which shows an example of the format of ITU-R601 format and MPEG2-MP @ ML system. Explanatory drawing which shows the output of a normal MPEG2 encoder. Explanatory drawing which shows the output of a normal MPEG2 encoder. Explanatory drawing which shows the output IP-converted by the prior art. Explanatory drawing which shows the output IP-converted by the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image processing apparatus 2a Luminance signal motion part detection means 2b Chroma signal motion part detection means 2c Chroma signal motion part detection means 2b, c Chroma signal motion part detection means 3 MPEG2-MP @ ML detection means 4 Interpolation processing means 5a IP conversion circuit 5b IP conversion circuit (interpolation pixel calculation means)
5c IP conversion circuit (interpolation pixel calculation means)
5b, c IP conversion circuit 6a Field memory (luminance signal delay means)
6b Field memory (chroma signal delay means)
6c Field memory (chroma signal delay means)
6b, c Field memory Y Luminance signal C Chroma signal Cb Chroma signal Cr Chroma signal Iy Input terminal Ic Input terminal Icb Input terminal Icr Input terminal 100 Control signal 101 Control signal 102 Control signal

Claims (8)

In an image processing apparatus that includes a motion part detection unit that detects a motion part of a corresponding pixel, and performs a process of converting an MPEG2-MP @ ML format signal into a progressive video signal.
MPEG2-MP @ ML detection means for detecting MPEG2-MP @ ML for a line in which no interlace video signal data exists and a line having only half the amount of vertical information peculiar to the MPEG2-MP @ ML system, and two types Interpolation processing means for performing interpolation processing while referring to the image data of the luminance signal according to the detection result of the motion part detection means when interpolating the chroma signal, and depending on the detection result of the MPEG2-MP @ ML detection means An image processing apparatus characterized by changing an interpolation method of interpolation pixel calculation, creating interpolation data, and converting the MPEG2-MP @ ML format signal into a progressive video signal based on the created interpolation data.   The image processing apparatus according to claim 1, wherein the interpolation processing means calculates at least one of difference data between even fields and odd fields, and uses the calculated difference data for the motion portion detection.   The interpolation processing means performs video determination of the two types of chroma signals, the MPEG2-MP @ ML detection means performs MP @ ML detection of the 4: 2: 0 signal of the MPEG2 signal, and the MPEG2- The image processing apparatus according to claim 1, further comprising a first interpolation process changing unit that changes the interpolation process according to a detection result of the MP @ ML detection unit.   The image processing apparatus according to claim 3, wherein the interpolation processing unit changes a detection threshold of the MPEG2-MP @ ML detection unit that performs the MPEG2-MP @ ML detection according to a type of a signal source.   2. The image according to claim 1, further comprising: a second interpolation processing change unit configured to change the interpolation processing according to the information of the reference data when the two types of chroma signals are interpolated based on the information of the luminance signal image data. Processing equipment.   The image processing apparatus according to claim 5, wherein the second interpolation process changing unit changes a threshold of the interpolation process according to information of the reference data.   The image processing apparatus according to claim 1, wherein the two types of chroma signals have independent threshold values. In an image processing method including a motion part detection process for detecting a motion part of a corresponding pixel, and performing a process of converting an MPEG2-MP @ ML format signal into a progressive video signal,
MPEG2-MP @ ML detection processing for detecting MPEG2-MP @ ML for a line in which no interlaced video signal data exists and a line having only half the amount of vertical information unique to the MPEG2-MP @ ML method; An interpolation process for interpolating the chroma signal while referring to the image data of the luminance signal according to the detection result of the motion part detection process, and interpolating according to the detection result of the MPEG2-MP @ ML detection process. An image processing method comprising: changing an interpolation method for pixel calculation, creating interpolation data, and converting the MPEG2-MP @ ML format signal into a progressive video signal based on the created interpolation data.

Images