Z-VALUE COORDINATE TRANSFORMATION CIRCUIT,申请号JP19950294750-传众专利搜索

Z-VALUE COORDINATE TRANSFORMATION CIRCUIT

申请公布号：JPH09115003(A)

申请号：JP19950294750

申请日期：1995.10.18

申请公布日期：1997.05.02

申请人：

TAITO CORP

发明人：KUBOTA SHUJI

分类号：G09G5/39;G06T15/40;G09G5/36;(IPC1-7):G06T15/40

主分类号：G09G5/39

摘要：PROBLEM TO BE SOLVED: To reduce the amount of data to be stored in a Z buffer RAM without practically lowering the accuracy of depth while considering characters when a main body observes a perspective image. SOLUTION: A Z-value coordinate transformation circuit is connected to a frame buffer control circuit 8 at a polygon control circuit 4. This Z-value coordinate transforming circuit is composed of a shift circuit 2 as a 1st transformation means, Z buffer RAM 1 and shift circuit 3 as a 2nd transforming means. At the shift circuit 2, a Z value is transformed into a non-linear coordinate system, which is expressed and non-linearly divided so as to enlarge the dimension of the coordinate intervals in depth information with the increase of depth, and stored in the Z buffer RAM 1. In the case of write into a frame buffer, the Z value read out of the Z buffer RAM is converted to have an original bit width and a polygon is written into the frame buffer by the frame buffer control circuit 8.