Gray scale transformation circuit

摘要

A gray scale transformation circuit has a picture memory for storing a set of video data. Each video data represents the gray level of a picture element of IC module picture image. The transformation circuit comprises a register for holding video data read out from the picture memory and a transformation memory including memory locations in which transformation data are preset. The memory locations have addresses as a regular gray scale for the video data. The transformation data preset in the transformation memory is a function of the regular gray scale. One of the memory locations of the transformation memory is selected by the content of the register. Transformation data is read out from the selected memory location to be transferred to an image processing unit.