Method and apparatus for encoding and decoding color images
First Claim
Patent Images
1. An image encoding apparatus comprising:
- a) input means for inputting color image data representing a color image;
b) first detection means for detecting an edge portion in the color image;
c) second detection means for detecting a portion having a specific color;
d) discrimination means for discriminating the edge portion having the specific color based on the detection result of said first and second detection means;
e) first encoding means for encoding the edge portion of the specific color discriminated by said discrimination means by using a first encoding method; and
f) second encoding means for encoding the color image data of at least a portion of the color image other than the edge portion of the specific color by using a second encoding method different from the first encoding method.
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Abstract
This invention relates to an image processing apparatus having a function of encoding or decoding image data and discloses a technique for extracting an image feature, especially a thin image portion of a specific color of an image, and for encoding the thin image portion with high efficiency to minimize degradation of image quality by selecting an appropriate encoding method.
88 Citations
31 Claims
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1. An image encoding apparatus comprising:
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a) input means for inputting color image data representing a color image; b) first detection means for detecting an edge portion in the color image; c) second detection means for detecting a portion having a specific color; d) discrimination means for discriminating the edge portion having the specific color based on the detection result of said first and second detection means; e) first encoding means for encoding the edge portion of the specific color discriminated by said discrimination means by using a first encoding method; and f) second encoding means for encoding the color image data of at least a portion of the color image other than the edge portion of the specific color by using a second encoding method different from the first encoding method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image processing apparatus comprising:
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a) emphasizing means for emphasizing an edge of input image data; b) detection means for detecting a line image portion of a specific color of the input image data; c) encoding means for encoding the line image portion of the specific color detected by said detection means and a remaining image portion except for the line image portion of the specific color in accordance with different encoding methods; d) extraction means for extracting an achromatic portion around the line image portion of the specific color; and e) substitution means for substituting an image of an original portion corresponding to a pattern obtained by said extracting means with an average value of color components around the line image portion of the specific color.
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12. An image processing apparatus comprising:
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a) emphasizing means for emphasizing an edge of input color image data representing a color image; b) first detection means for detecting an edge portion in the color image based on the input image data of the edge emphasized by said emphasizing means; c) second detection means for detecting a portion having a specific color; d) discrimination means for discriminating the edge portion having the specific color based on the detection result of said first and second detection means; e) first encoding means for encoding the edge portion of the specific color discriminated by said discrimination means by using a first encoding method; and f) second encoding means for encoding the color image data of at least a portion of the color image other than the edge portion of the specific color by using a second encoding method different from the first encoding method. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An image processing apparatus comprising:
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a) input means for inputting color image data representing a color image; b) first detecting means for detecting an edge portion in the color image; c) second detection means for detecting a portion having a specific color; d) discrimination means for discriminating the edge portion having the specific color based on the detection result of said first and second detection means; e) enlarging means for enlarging the edge portion of the specific color discriminated by said discrimination means; f) first encoding means for encoding the edge portion of the specific color enlarged by said enlarging means by using a first encoding method; and g) second encoding means for encoding the color image data of at least a portion of the color image other than the edge portion of the specific color enlarged by said enlarging means by using a second encoding method different from the first encoding method. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An image encoding apparatus comprising:
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a) input means for inputting color image data representing a color image; b) first detection means for detecting an edge portion in the color image; c) second detection means for detecting a portion having a plurality of specific colors; d) discrimination means for discriminating the edge portion having the plurality of specific colors based on the detection result of said first and second detection means; e) first encoding means for encoding the edge portion of the plurality of specific colors discriminated by said discrimination means by using a first encoding method; and f) second encoding means for encoding the color image data of at least a portion of the color image other than the edge portion of the plurality of specific colors by using a second encoding method different from the first encoding method. - View Dependent Claims (27, 28)
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29. An image processing apparatus comprising:
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first extracting means for extracting a line image portion having a predetermined color from a color image represented by input color image data; second extracting means for extracting an image portion around the line image portion having a color substantially similar to the predetermined color; and processing means for changing the input image date in the image portion extracted by said second extracting means. - View Dependent Claims (30, 31)
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Specification