| 摘要 |
PURPOSE:To improve picture quality, to simplify a generation circuit, and to provide an arbitrary deformation ratio by performing a sum of products arithmetic operation by reflecting the decimal part of a deformation ratio and that of a coordinate value. CONSTITUTION:A coordinate transformation circuit 8 in a processing means 2 sends the integer part (X', Y') of inversely transformed coordinate P (X, Y) and the deformation ratio, for example, the integer part r' of reduction ratio (r) (rational number including a decimal) to a memory access circuit 9, and also, the coordinate transformation circuit 8 sends the decimal part (X'', Y'') of the inversely transformed coordinate P (X, Y) and the reduction ratio (r) to a coefficient generation circuit 10. The memory access circuit 9 generates (2r'X2r') neighboring grid coordinates Pi (i=1, 2, 3,...) having a point P as the center, and accesses original image memory 3. An arithmetic circuit 11 performs the sum of products arithmetic operation SIGMACiXSi by neighboring block data Si from the original image memory 3 and by a coefficient Ci from the coefficient formation circuit 10, and calculates a transform picture element values that is conversion data at the coordinate P (X, Y). |
