JPS6138981A - Pattern multiplication - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to enlarging a pattern formed by a set of dots,
This relates to a method of reducing and outputting.

[Prior Art] Conventionally, methods for enlarging and reducing patterns such as character fonts and images include the thinning and insertion method, the SPC method, the 9-division method, and the projection method. ``A missing J appeared, only one of the two parallel tree lines disappeared, and when enlarged, the diagonal line became step-like, creating an unnatural appearance.

[Objective] The present invention provides a pattern scaling method that can obtain a high-quality enlarged or reduced pattern by reducing "missing parts" when reducing the pattern, and reducing unnaturalness of diagonal areas by smoothing when enlarging the pattern. It provides:

[Example] Figure 1 shows that the total pixels of the original font (16 pixels in the figure) where LXL is one pixel and the total pixels after conversion (9 pixels in the figure) where L'×L' is one pixel are approximately equal. The center of the original pixel when it is reduced by 374 times both vertically and horizontally to have the same area
2 is a diagram showing the positional relationship between the center of the converted pixel (indicated by an x mark) and the center of the converted pixel (indicated by an x mark). Also, the solid line is the boundary of the original pixel, and the broken line is the boundary of the converted pixel. When a black pixel is represented by a black circle ゛・゛ and a white pixel is represented by a white circle "O°', in this embodiment, surrounding any converted pixel P are L, M, N, and these original pixels are L, M, If the state of the original pixels outside the rectangle formed by If the pixel exists outside the contour, the corresponding converted pixel is set as a black pixel, and if it exists outside the contour, the corresponding converted pixel is set as a white pixel. 44 patterns are set.Furthermore, if it does not correspond to any of the above patterns, set 1 as shown in Figure 5.
Similar treatment is performed for the two patterns. Here, the patterns shown in FIGS. 3(g) to (X) are considered to be orthogonal portions and are not smoothed. In the case of kanji, since orthogonal portions and diagonal portions coexist, smoothing only the diagonal portions is effective in preventing deterioration of character quality. Moreover, the ability to smooth contour lines having a plurality of inclinations has a great effect on preventing deterioration of character quality.

FIG. 6 shows the area division, where area 45 is area 7.
and 21, and 11 and 12, and 46 is the boundary between 18 and 3.
2. The boundary between 22 and 33, 47 is 29 and 43. 33 and 44
boundary, 48 is 40 and 10.44 and 11 boundary, and 4
9 is the boundary between 11 and 22, 33 and 44. The logical expressions for each region are determined so as to satisfy the relationships shown in FIGS. 3, 4, and 5. On the boundary, the values in adjacent areas are logically summed.

The process of determining the black and white values of the converted pixel according to which of the patterns shown in FIGS. 3 to 5 the surrounding original pixels of the converted pixel correspond to as described above is performed for all converted pixels, thereby completing the enlargement and reduction processing. .

An example in which the above processing is actually realized by a circuit is shown in FIGS. 7 and 8. When a character code is specified using the keyboard Vl, the scaling section v
The font data in a 7-heta matrix is moved, and after being enlarged and reduced, it is output from the printer V6. The above control is performed using a program stored in ROMV3, RAMV4, and microprocessor v5. The enlarging/reducing section v7 is shown in FIG. character generator v2
Parallel data of fonts from interface section V
Convert to serial data using IO.

The line buffer section Vll holds data for 4 lines and extracts data of 16 original pixels surrounding the converted pixel. The pattern determining section V12 determines which of the patterns shown in FIGS. 3, 4, and 5 corresponds to the pattern signal S4, and outputs the pattern signal S4. The data determination unit V13 determines the black and white value of the converted pixel by a logical operation of the pattern signal S4 and the gray area signal indicating which area the converted pixel belongs to shown in FIG. A table of area signals corresponding to the magnification ratio is stored in the control unit V15.
This is read out in synchronization with the data determining section V13. The interface unit V14 converts the serial data into parallel data and outputs it to the data bus v9.

FIG. 9 shows a control flowchart of the above embodiment.

In step S1, it is first determined whether or not the received instruction is a variable magnification instruction, and if it is a variable magnification instruction, the variable magnification is stored in RAMV4 in step S2. Next, in step S3, the character code sent with the scaling command is CG, V2.
Access CG.

The font data read from V2 is sent to the enlargement/reduction section v7. The variable magnification stored in RAMV4 in step S5 is read out, and the table in the control unit V15 is accessed according to the variable magnification. In step S6, data for 4 lines is held in the line buffer Vll, and 16 pixel data from this is extracted and sent to the pattern determination section V12.
The type of pattern is determined by comparing it with previously stored patterns as shown in FIGS. 3 to 5, and a pattern signal indicating the type of pattern is sent out. The data determining unit V13 determines whether the converted pixel should be white or black based on the sent pattern signal and the area signal sent from the control unit V15 (step S8). In step S9, it is determined whether or not all converted pixels have been determined to be black or white. If not all have been determined, the process returns to step S5. If all have been determined, the converted pixels are output to the printer 6 and printed (not shown). Store in buffer and print.

When performing the above-mentioned conversion process, it is also possible to divide the surrounding W of the converted pixel, a plane surrounded by one pixel, into partial bonds, and set a logical operation formula based on the black and white values of the surrounding original pixels for each area. It will be done. In the above method, if the area in which each converted pixel exists and the black-and-white values of surrounding original pixels are given, the black-and-white values of the converted pixel are determined by logical operations corresponding to the area, and scaling can be performed.

[Effect] If you perform scaling such as scaling using the method described above, you will hardly see any missing J when scaling down.Also, when enlarging, areas where black pixels are orthogonal will be enlarged while remaining orthogonal, and diagonal lines will appear. This has the effect of eliminating unnaturalness by enlarging the part as a smooth diagonal line.In particular, it is possible to obtain high-quality enlarged/reduced characters for Kanji fonts.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the positional relationship between original pixels and converted pixels, FIG. 2 is a diagram showing an example of a smoothing pattern, and FIGS. 3, 4, and 5 are diagrams showing smoothing patterns. Fig. 6 is a diagram showing the outline of a smoothing pattern on the same drawing, Fig. 7 is a diagram showing an embodiment of a pattern magnification device to which the present invention is applied, and Fig. 8 is an enlarged view of Fig. 7. FIG. 9 is a control flowchart of the above embodiment, showing the reduction section in more detail. Here, ■1...Keyboard input device, V2...Character generator, v3...ROM, V4...
RAM, V5...Microprocessor, v6...Printer, v7...Enlargement/reduction section, v8...Address bus, v9...Data bus, VIO...Interface section, Vll...Line buffer section, v12...pattern judgment section, V13...data confirmation section, V14...
-Interface section, V15...control section. 1 in Fig. 2 7/ ・Q Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] The converted pixel is determined by checking the pattern of the original pixels around the converted pixel so that the total pixels of the original font represented by a dot matrix and the total pixels after conversion occupy approximately the same area, and comparing it with the memorized pattern. A pattern scaling method characterized by determining .