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1. 发明专利

DE3677013D1 未知
公开(公告)号：DE3677013D1
公开(公告)日：1991-02-21
申请号：DE3677013
申请日：1986-03-24
申请人： APRICOT SIGMEX LTD
发明人： JALES JAMES , ELGOOD CHRISTOPHER
IPC分类号： G09G5/02 , G09G1/28
摘要： PCT No. PCT/GB86/00171 Sec. 371 Date Nov. 20, 1986 Sec. 102(e) Date Nov. 20, 1986 PCT Filed Mar. 24, 1986 PCT Pub. No. WO86/05911 PCT Pub. Date Oct. 9, 1986.Computer graphics requiring three dimensional representation needs very fine color shading which is not possible with only 8 planes (bits) per pixel. In order to provide improved color shading with acceptable resolution a video raster signal, with n (e.g. 8) planes per pixel and based on a resolution of x pixels per line and y lines, can be selectively processed (M1, M2, M3)3) to provide mn (e.g. 16 or 24) planes per macro-pixel where m is an integer greater than 1 and m=m1.m2 where m1 is the dimension in pixels of each macro-pixel along the scan lines and m2 is the dimension of each macro-pixel transverse to the scan lines (in terms of lines of normal raster). In one arrangement the 16 planes normally used to drive 3 color guns (red, green and blue) for an odd-even pixel pair are used for providing non-intersecting sets of 5 planes for each of the guns. In another arrangement the 8 planes for odd and even pixels (i.e. 16 planes available) are used for the red and green guns respectively in one scan line of each pair of scan lines and in the other scan line of the pairs 8 of the 16 planes are used for the blue gun, each of the guns being operated for 50% of the pixel scanning time.

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