Color image region management system and color image region management method and color image region retrieval method
First Claim
1. A color image region management system comprising:
- color class determination means for determining, for each picture element of image data in which color data of each picture element is expressed by a trichromatic system, to which color class the color of the picture element belongs of a plurality of color classes divided on the basis of a perceptual color system, andcolor index memory means for constructing tree structure data reaching from leaf nodes to a root node, each leaf node including at least one picture element, and calculating, for each node in said tree structure data and for each color class in regards to the picture elements included in the node, a frequency of picture elements which have a color belonging to the color class, and storing in said each node the calculated frequency of picture elements as a color index for each color class.
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Abstract
A color image region management system suitable for retrieving a region having a specified color. Color class is determined for each picture element of image data in which the color data of each picture element is expressed by a trichromatic system. In the trichromatic system, it is determined to which color class the color of the picture element belongs of a plurality of color classes divided on the basis of a perceptual color system. There is a color index memory for constructing tree structure data reaching a root node with blocks each including at least one picture element as a leaf node, and calculating, for each node in the tree structure data and for each color class in regards to the picture elements included in the node, the frequency of picture elements having a color belonging to the color class. The calculated frequency of the picture elements is stored as a color index for each color class.
38 Citations
13 Claims
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1. A color image region management system comprising:
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color class determination means for determining, for each picture element of image data in which color data of each picture element is expressed by a trichromatic system, to which color class the color of the picture element belongs of a plurality of color classes divided on the basis of a perceptual color system, and color index memory means for constructing tree structure data reaching from leaf nodes to a root node, each leaf node including at least one picture element, and calculating, for each node in said tree structure data and for each color class in regards to the picture elements included in the node, a frequency of picture elements which have a color belonging to the color class, and storing in said each node the calculated frequency of picture elements as a color index for each color class. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A color image region management method comprising the steps of:
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converting color data of each picture element of image data from a trichromatic system to a perceptual color system, dividing a color space based on the perceptual color system into a plurality of color classes, determining which color class of said plurality of color classes the color of a picture element belongs to, and constructing tree structure data reaching from leaf nodes to a root node, each leaf node including at least one picture element, and for each node in said tree structure data and for each color class in regards to the picture elements included in the node, calculating a frequency of picture elements which have a color belonging to the color class, and storing in said each node the calculated frequency as a color index for each color class. - View Dependent Claims (12, 13)
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11. A color image region management system comprising:
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an image input device for fetching an original image as image data expressed by a trichromatic system, storage means for storing the image data expressed by the trichromatic system which is output from said image input device, color class determination means for determining, for each picture element of the image data in which color data of each picture element is expressed by the trichromatic system, to which color class the color of the picture element belongs of a plurality of color classes divided on the basis of a perceptual color system, and color index memory means for constructing tree structure data reaching from leaf nodes to a root node, each leaf node including at least one picture element, and for each node in said tree structure data and for each color class in regards to the picture elements included in the node, calculating a frequency of picture elements which have a color belonging to the color class, and storing in said each node the frequency as a color index for each color class.
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Specification