JPS6454578A - Image arithmetic unit - Google Patents

Abstract

PURPOSE:To execute the operation at high speed, since every operation can be executed by only reading out a data with a single image converter, by preparing in advance a result of operation to all combinations of plural image data, as a data table. CONSTITUTION:At the time of operation of an image data, the image data is inputted as an address input to an image converter 17 from image memories 13, 14. In this case, for instance, by using high-order 2 bits of an address input data so that the kind of the operation can be known, the result of operation corresponding thereto can be read out of the data table. The read out result of operation is written in an image memory 15, and if necessary, the arithmetic processing is performed again. In this case, since the data table is read out at high speed, the operation of two image data can be executed by one cycle. Accordingly, all the processings can be executed by the timing of a bus clock, and a timing controller can be eliminated.