Method of and apparatus for generating reduced image
First Claim
1. An apparatus for generating a reduced image based on original image data representing an original image having linework including plural pixels, the original image data including pixel data for each pixel in said original image, each said pixel data expressed in one of plural color codes, the apparatus comprising:
- an image memory for storing original image data representing said original image, said original image being divided into a plurality of regions each having a predetermined shape;
a priority memory for storing an order of priority of said color codes;
extraction means for extracting only one representative pixel data from plural pixel data within each region of a predetermined shape in said original image according to said order of priority, wherein said extraction means includes judging means for judging whether said color code of each of said plural pixel data is stored in said priority memory and representative pixel data selection means for selecting said only one representative pixel data having a color code with a highest priority according to said order of priority when at least one said color code is stored in said priority memory; and
reduced image generation means for receiving said extracted only one representative pixel data and displaying a reduced image without omission of lines in the linework based upon said extracted only one representative pixel data for each region in said original image,said representative pixel data selection means of said extraction means further comprising;
means for selecting pixel data at a predetermined pixel position in each region as said representative pixel data when said color code is not stored in said priority memory.
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Abstract
Representative pixel data is extracted for each predetermined region in an original image according to priority of color codes representing colors. The representative pixel data constitute a reduced image. The reduced image is a clear and complete reproduction of the original image without line omissions and distortion of a desired linework. M pieces of pixel data on each scanning line are successively read until the pixel data reaches a maximum value Xmax in a main scanning direction. One pixel data having a color code with the highest priority is selected from the read pixel data according to a priority code table TBL. If the color code is not in the priority table, pixel data at a predetermined position in the region of the read pixel data is selected. The results of selection for two adjacent scanning lines are compared based on the priority code table TBL, and final representative pixel data is selected.
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Citations
15 Claims
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1. An apparatus for generating a reduced image based on original image data representing an original image having linework including plural pixels, the original image data including pixel data for each pixel in said original image, each said pixel data expressed in one of plural color codes, the apparatus comprising:
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an image memory for storing original image data representing said original image, said original image being divided into a plurality of regions each having a predetermined shape; a priority memory for storing an order of priority of said color codes; extraction means for extracting only one representative pixel data from plural pixel data within each region of a predetermined shape in said original image according to said order of priority, wherein said extraction means includes judging means for judging whether said color code of each of said plural pixel data is stored in said priority memory and representative pixel data selection means for selecting said only one representative pixel data having a color code with a highest priority according to said order of priority when at least one said color code is stored in said priority memory; and reduced image generation means for receiving said extracted only one representative pixel data and displaying a reduced image without omission of lines in the linework based upon said extracted only one representative pixel data for each region in said original image, said representative pixel data selection means of said extraction means further comprising; means for selecting pixel data at a predetermined pixel position in each region as said representative pixel data when said color code is not stored in said priority memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of generating a reduced image based on original image data representing an original image having linework including plural pixels, the original image data including pixel data for each pixel in said original image, each said pixel data expressed in one of plural color codes, the method comprising the steps of:
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storing the original image data representing said original image, said original image being divided into a plurality of regions each having a predetermined shape and (a) determining an order of priority of said color codes; (b) extracting only one representative pixel data having a color code with a highest priority according to said order of priority from plural pixel data within each region of a predetermined shape in said original image according to said order of priority, wherein step (b) includes the steps of; (b-1) judging whether said color code of each of said plural pixel data is stored in a priority memory; and (b-2) selecting said only one representative pixel data according to said order of priority when at least one said color code is stored in said priority memory; (c) displaying a reduced image without omission of lines in the linework based upon said extracted only one representative pixel data for each region in said original image; said step (b-2) further including selecting pixel data at a predetermined pixel position in each region as said representative pixel data when said color code is not stored in said priority memory. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification