JPS5625870A - Picture prediction and recovery method - Google Patents

Abstract

PURPOSE:To enable high density processing independently of video element density, by determining the distribution of the concentration level when the picture information of low video element density is reproduced as the picture of high video element density, so that the areas of the same level can be adjacent and the average level can be decided equally to the level at sampling. CONSTITUTION:The sampling video element signal read in with the scanner is sequentially fed to the shift registers 1-3, and the concentration level information in the specific area can temporarily be stored. Each content of the registers 1-3 is fed to the comparator 4, the maximum level is detected and the result is fed to the operation unit 5. Further, each content of the registers 1-3 and the designation signal from the system controller 6 are fed to the operation unit 5. Further, depending on the rate of change of the screen density, the difference of area between each sampling video element and small video element for the black level in the specific area is calculated, the area difference and the predetermined threshold level are compared to discriminate the difference, and the average level is made equal to the level at sampling and input to the buffer memory 7.