Picture information coding method

Abstract

Abstract PURPOSE:To make coding the information including the halftone, by grasping the video element for the part from each video element information consecutive sequentially through multivalue sampling of picture dissolving into video element unit and executing the optimum coding according to the video quality. CONSTITUTION:The video signal read in the video element unit at the scanner is made to N-value quantization at the quantizing unit 1, and this quantized signal is fed to the delay circuit 2 for one video element's share and the differential unit 3. The difference between the concentration level of delayed video element with this differential unit 3 and that of the noticed video element is detected and the difference is fed to the coding table 4 and the output of the quantizing unit 1 is directly fed to the table 4. At this table 4, the concentration level of the first video element of the unit block from the quantizing unit 1 is coded with the combination of binary code from a given rule, and when the concentration level value of the video element consecutive is minumum or maximum level, run length coding is made, and when the concentration level is at halftone level, the differential coding is made and the result is fed to RAM5 of the reception side II.

Inventors

• 👤 Koichi Ejiri

Bibliographic Details