| 摘要 |
PURPOSE:To obtain an image of high picture quality by correcting a deviation between the edge of a practical image and plotted points even if the calculated result of a real number is rounded to an integer value at the time of plotting a graphic. CONSTITUTION:An error correcting means 20 for finding out an error DELTAx generated at the time of rounding the calculated result of a starting point XS for the horizontal scanning of the left side of a polygon to the value of an integer point for raster display and correcting a brightness value and a depth value obtained by the linear interpolation calculation of horizontal coordinates only by an error value is added to the three-dimensional graphic processor 10. Since the brightness value and the depth value obtained by the linear interpolation calculation of the horizontal coordinates are corrected only by the error value, the values of plotted grating points can be obtained. Thereby, the calculated results of respective graphics on the boundary between the two graphics almost coincide with each other, plotting on the boundary is made continuous and natural and the image of high picture quality can be obtained. |
