| 摘要 |
A0308/7004 9040K PEK/spK PATCH BOUNDARY DETECTOR CIRCUIT FOR A VIDEO SPECIAL EFFECTS SYSTEM A two-stage accumulating register circuit sequentially evaluates a boundary equation of the form AX+BY+C for each pixel in a raster-scan video special effects display, where A, B and C are coefficients of the boundary and X and Y are the pixel and line values of each pixel in the display. Each register stage is synchronized with the special effects system clocks to generate the completed output at the required pixel rate. One register stage generates the term AX and the other register stage generates the term BY+C. A plurality of N register circuits are fabricated on one integrated circuit in order to form a detector circuit which can detect whether a pixel lies within an N-sided patch on the display.
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