| 摘要 |
PURPOSE:To obtain a center projected output picture easily and effectively by calculating a three-dimensional projected coordinate address through three- dimensional projected conversion by means of data on the height of a coordinate address calculated through two-dimensional reverse-projected conversion. CONSTITUTION:A two-dimensional reverse-projected conversion calculating circuit 4 calculates a coordinate address of an input picture corresponding to that in a altitude of zero of a center-projected picture to be converted and outputted by means of two-dimensional reverse-projected conversion. By utilizing altitude data in the corresponding coordinate address on the input picture, a three-dimensional projected convertion circuit 5 calculates a three-dimensional projected conversion output coordinate address of the center-projected picture by means of three-dimensional projected conversion. An end point address of an output picture memory 3 is specified in a coordinate address of the obtained three-dimensional projected conversion output, and input picture data of an input picture memory 1 is written on the specified address. |
