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1. 发明专利

JPH0799586A COLOR CONVERSION DEVICE 失效
公开(公告)号：JPH0799586A
公开(公告)日：1995-04-11
申请号：JP23006493
申请日：1993-09-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMORI KATSUHIRO , YAMADA OSAMU , MOTOMURA HIDETO , IIKAWA RIKA , FUMOTO TERUO , KODERA HIROAKI
IPC分类号： G03F3/08 , H04N1/46 , H04N1/60
摘要： PURPOSE:To provide a small sized and simple color conversion device in which color conversion can be achieved so as to be convenient for interactive color collection on a display device and so as not to disturb a picture. CONSTITUTION:A lightness color difference signal YCrCb is inputted to a picture element input part 101, a triangular prism division selection part 103 selects a triangular prism being an interpolation block and generates a Prsmsel signal. An address of a color conversion table part 104 in data is written in advance with the signal and a signal on lines 111 and 6 lattice point outputs are obtained. The lattice point outputs, the Prsmsel signal and a signal on a line 112 are inputted to a triangular prism type interpolation arithmetic part 105, from which an interpolation output 113 is generated. A conversion RAM is selected for each picture element or a rectangular area decided in advance by a color conversion table RAM switching signal 115 inputted externally and by an area processing part 107.

2. 发明专利

JPH06268854A COLOR CORRECTION DEVICE 失效
公开(公告)号：JPH06268854A
公开(公告)日：1994-09-22
申请号：JP5189593
申请日：1993-03-12
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： IIKAWA RIKA , YAMADA OSAMU , KANAMORI KATSUHIRO , FUMOTO TERUO
IPC分类号： H04N1/60 , H04N1/40 , H04N1/46
摘要： PURPOSE:To approximate an optional input color space defining an input picture into a desired output color space with high accuracy in the processing system executing picture conversion between input and output. CONSTITUTION:A color picture is read by a scanner system 12 to generate an input color signal 13, and a matrix conversion circuit 15 is used for rough adjustment to obtain a conversion subject to matrix conversion. Moreover, in order to correct high degree nonlinearity by a high degree nonlinearity correction circuit 17, linear arithmetic operation using input output relevant values of a representative color point set to a color space is executed.

3. 发明专利

JPH0799587A METHOD AND DEVICE FOR CONVERTING COLOR 失效
公开(公告)号：JPH0799587A
公开(公告)日：1995-04-11
申请号：JP23620593
申请日：1993-09-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMORI KATSUHIRO , YAMADA OSAMU , KIMURA HIDETO , IIKAWA RIKA , FUMOTO TERUO , KODERA HIROAKI
IPC分类号： H04N1/60 , H04N1/46
摘要： PURPOSE:To reduce the error of a black color production and to decrease the capacity of a color conversion table memory by setting a color space formed along a diagonal axis direction of a space of an input color signal so as to be included by an oblique solid group so as to interpolate an output corresponding to an input color with an output of each apex. CONSTITUTION:A picture element input section 101 separates picture input signal R, G, B into high-order bits RH, GH, BH and lower-order bits RL, GL, BL. A comparator part 103 compares the RL, BL and the BL, GL and an adder part 115 adds the comparison results C1, C2 to the RH, BH and the sum is inputted to a memory address generating part 102, in which addresses in a color conversion table memory 107 are generated. A weight generating part 104 outputs differences RL-GL and BL-GL and the GL. An oblique triangular prism interpolation arithmetic part 110 divides a 3 primary color input space such as RGB or CMY into unit solid areas and sets the input color space entire area to be included by an oblique triangular prism by estimating the oblique triangular prism made of apexes forming an upper bottom and a lower bottom side on each unit solid adjacent each other along the diagonal axis direction of the input space and an output corresponding to an optional input color is interpolated by using an output of each apex of the triangular prism.

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