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    • 98. 发明专利
    • COLOR INFORMATION CONVERTING DEVICE
    • JPH09330398A
    • 1997-12-22
    • JP14711196
    • 1996-06-10
    • NIPPON TELEGRAPH & TELEPHONE
    • HAMANO TERUOKAJII TAKESHISASAKI TSUTOMUSONEHARA NOBORU
    • H04N1/46G06T1/00G06T5/00G09G5/00G09G5/36
    • PROBLEM TO BE SOLVED: To enable the retrieval and output of image information containing color information out of a distributed data base system even from facsimile equipment by successively converting the color information of respective picture elements in the image information to monochromatic image information having luminance information preserving the distance relation among the respective pieces of color information inside a color space. SOLUTION: The color information of respective picture elements in the image information is successively inputted from an image information input means 1. A coordinate transforming means 2 transforms the inputted color information to a discrete coordinate system having coordinate axes expressing luminance components and stores the coordinate values of transformed color information in a color coordinate information storage means 31. On the other hand, a Peano scan processing means 32 scans all the grid points of the discrete coordinate system along a three-dimensional Peano curve with the origin of the discrete coordinate system as a starting point to an ending point on the coordinate axes expressing the luminance components and outputs the information of distance from the starting point to the ending point at the time when the coordinate values of grid points are coincident with the coordinate axes stored in the color coordinate information storage means 31. A luminance value converting means 4 performs arithmetic for multiplying the distance information for a constant and outputs the result to a luminance value output means 5.