JP2633566B2 - Image processing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing method, and more particularly to an image processing method for performing shape error correction when a figure given contour information is painted and developed.

2. Description of the Related Art Conventionally, when contour image data is developed into a dot pattern and drawn, coordinate values of the contour given by real values are converted into coordinates corresponding to, for example, addresses of a memory for developing the dot pattern. The value is simply converted to a value, and the inside of the outline is painted.

[Problems to be Solved by the Invention] For this reason, in a case where the outline is entirely filled with black (filled), if the outline is simply filled with dots, the outline of the original figure is obtained. Disappears, and the features of the original figure are lost. In addition, as shown in Fig. 11, blank areas where figures are closely connected
In 80 and 81, when the scale became small, the blank portions 80 and 81 disappeared, and the figures were collapsed.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional example, and has as its object to provide an image processing method that prevents the collapse of an area where a blank portion of image data is small and makes use of features of an outline.

[Means for Solving the Problems] To achieve the above object, an image processing method according to the present invention comprises the steps of: inputting contour data of graphic information; and detecting a contour pattern of the graphic information based on the contour data. Is created, a filling pattern is created by filling the inside of the outline pattern, a thinning pattern is created by thinning the filling pattern, and an exclusive OR of the thinning pattern obtained by thinning the filling pattern and the outline pattern is calculated. obtain.

According to the image processing method of the present invention described above, contour data of graphic information is input, a contour pattern of graphic information is created based on the contour data, and the contour pattern is filled. Create a filled pattern. Further, a thin pattern obtained by thinning the fill pattern is created, and an exclusive OR of the thin pattern and the contour data is obtained.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Description of Graphic Processing Apparatus (FIG. 1)] FIG. 1 is a block diagram showing a schematic configuration of a graphic processing apparatus according to the embodiment.

In the figure, reference numeral 1 denotes an MPU (microprocessor unit) such as a microprocessor for controlling the entire apparatus in accordance with a control program in the ROM 7 shown in the flowchart of FIG. Reference numerals 2 and 3 denote floppy disk devices and hard disk devices for storing document data, image data, and the like, respectively, which are connected to the system bus 10 via the disk interface unit 6. Reference numerals 4 and 5 denote image memories each having substantially the same memory capacity. Pattern data is developed into dot images in the form of dots, and the image data is transferred to the video memory 11 for display on a CRT. 15 through 14 printer
Can be output to

7 is the RO that stores the control program and data of MPU1
M and 8 are RAMs used as a work area of the MPU 1 and temporarily storing character data and other various data input from the system bus 10. Reference numeral 11 denotes a video memory (VRAM) for storing bit map data for display output to the CRT 12, which receives and stores the image data from the image memory 4 or 5 as it is, and
It can be displayed on T12.

13 is Bit Manipulation Unit (BMU)
It operates bit data of the image memories 4 and 5 and the video memory 11 and has a DMA transfer function between the memories. A printer 14 prints out a dot image based on the dot data sent via the printer interface unit 15.
Printing can be performed based on image data from the RAM 5 or the RAM 8 and the video memory (VRAM) 11. Reference numeral 16 denotes a keyboard for inputting various data and instruction data.

[Contour Correction Processing (FIGS. 2 to 6)] FIG. 2 is a flowchart of the contour correction processing of the embodiment.

First, an outline is drawn in the image memory 4 in step S1. This may be created based on coordinate values input from the keyboard 16 or the like, or may be created based on image data input from the disk 2 or 3. In step S2, the thickness of the outline is set to CRT12 or
In the image memory 5, data having a thickness corresponding to one dot of the output dot is created. This is shown in the contour pattern in FIG.

Next, in step S3, the inside of the outline of the image memory 4 is painted out to obtain the pattern data shown in FIG.
In step S4, a thinning process is performed on the fill pattern in the image memory 4 shown in FIG. This reduces the pattern by one dot along the outer edge of the fill pattern (the result is shown in FIG. 5).

Next, in step S5, an exclusive OR of the narrow pattern shown in FIG. 5 and the contour pattern shown in FIG. 3 is obtained to obtain pattern data shown in FIG. By doing so, the features of the contour shown in FIG. 3 are better represented in the pattern of FIG. 5 than in the filled pattern of FIG.

[Explanation of Second Embodiment (FIGS. 7 to 10)] In the first embodiment, the drawing direction of the contour line in FIG.
However, when α ≦ Ψ <α + 180 ° (α is 0 ° here), an outline is formed by the dot pattern of FIG. 7, and when the drawing direction of the outline is α + 180 ° ≦ ゜ <α + 360 °, By drawing an outline using the dot pattern shown in FIG. 8, the pattern shown in FIG. 9 is obtained.

Then, a pattern shown in FIG. 10 is obtained by taking an exclusive OR of this contour pattern and the narrow pattern in FIG.

In this case as well, the features of the contour lines shown in FIG. 3 are well represented as in the case of FIG. 6, and the same effects as in the above-described embodiment can be obtained.

The switching or selection of the contour pattern may be appropriately selected according to the resolution of the output device, the size of the output dot, and the like.

In the above-described embodiment, a halftone pattern having a black-and-white ratio of 1: 1 has been described as an example of hatching corresponding to the drawing direction of the contour line. However, the present invention is not limited to this. It may be set as appropriate depending on the thickness of the point.

As described above, according to the present embodiment, when the inside of the outline of an arbitrary figure is filled, the characteristic of the outline can be left and the visual figure can be prevented from being crushed.

[Effects of the Invention] As described above, according to the present invention, when the inside of a contour of a figure is filled, the features of the contour can be left and the collapse of the figure filled with the inside of the contour can be prevented. There is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a graphic processing apparatus of the present embodiment, FIG. 2 is a flowchart of an outline correction process of the embodiment, FIG. 3 is a diagram showing an example of an outline pattern to be corrected, FIG. 4 is a view showing an example of a figure in which the outline shown in FIG. 3 is filled, FIG. 5 is a view showing an example of a figure obtained by thinning the figure of FIG. 4, and FIG. 6 is a view of FIG. FIG. 7 is a diagram showing an example of a figure obtained by performing an exclusive OR of the contour pattern and the fill pattern in FIG. 4, FIGS. 7 and 8 are diagrams showing an example of a correction pattern of the contour pattern, and FIG. FIG. 10 is a diagram showing an example of an outline pattern converted according to the second embodiment. FIG. 10 is a diagram showing a pattern obtained by taking an exclusive OR of the outline pattern of FIG. 9 and the fill pattern of FIG. 11 (A) and 11 (B) are diagrams showing an example of a fill pattern of a conventional example. . In the figure, 1 ... MPU, 2 ... Floppy disk, 3 ...
Hard disk, 4, 5 ... Image memory, 6 ... Disk interface unit, 7 ... ROM, 8 ... RAM, 10
… System bus, 11… VRAM, 12… CRT, 13… Bit management unit, 14… Printer, 15
.., A printer interface unit, and 16 a keyboard.

Claims (3)

(57) [Claims] 1. An outline data of graphic information is input, an outline pattern of the graphic information is created based on the outline data, a fill pattern in which the outline pattern is filled is created, and the fill is performed. An image processing method comprising: creating a thin pattern obtained by narrowing a pattern; and obtaining an exclusive OR of the thinned pattern obtained by narrowing the fill pattern and the contour data. 2. The image processing method according to claim 1, wherein the narrow pattern is created by removing the contour pattern from the fill pattern. 3. When the exclusive OR is obtained, the contour pattern is further converted in accordance with the drawing direction of the contour pattern, and the exclusive contour of the converted contour pattern and the fill pattern is exclusive. The image processing method according to claim 1, wherein a logical sum is obtained.