COMPRESSING CIRCUIT OF PICTURE DATA

摘要

PURPOSE:To set a split picture to be compressed at an optional size and at the same time to decrease the processing time, by compressing a split picture obtained by cutting out a linear picture into a square form at each intersection of grating lines and a picture which is turned rectangularly to said split picture with a switch between both pictures. CONSTITUTION:A video signal S is obtained for each split picture obtained by cutting out a linear picture for every intersection of grating lines and into a square form of every plural picture elements and then reading the split picture after a raster scan. While a video signal S' is obtained by rotating rectangularly the split picture obtained from a video buffer 6 on the plane of the split picture. A switch circuit 2 supplies these two signals S and S' with a switch to a compressing circuit 3. The circuit 3 compresses the data of plural dots on each scanning line of the raster scan into data of plural dots arrayed in the subscanning direction. A compressing circuit 4 compresses the data of plural dots into data of 2 dots in response to the value of each prescribed region in the subscanning region. The compressed data is delivered via a buffer 5.