Patent ID: 6816550
Filing Date: 2004-11-09
Classification: H04N

Abstract:
An image signal coding apparatus comprising:bit stream generation circuitry for coding an image signal to generate a bit stream of coded image data; difference detection circuitry calculating a number of bits of coded image data for each predetermined processing unit section of the bit stream from said bit stream generation circuitry and obtaining a difference between the calculated number of bits and a predetermined reference number of bits; insertion circuitry generating a difference code indicating the difference detected by said difference detection circuitry and a stuff start code indicating an inserting position of said difference code, and outputting the bit stream to a bit stream memory after inserting the difference code and the stuff code into the processing unit section of the bit stream; output circuitry extracting said stuff start code and said difference code from the bit stream read out from said bit stream memory and inserting stuff bits by a number indicated by said difference code into a corresponding processing unit section, starting at a position indicated by said stuff start code, to generate and output a multiplexed bit stream; addition circuitry adding an amount of data bits written in said bit stream memory and an amount of data bits indicated by said difference code; and subtraction circuitry subtracting an amount of stuff bits inserted by said output circuitry from an output value of said addition circuitry, when the difference code is extracted by said output circuitry, to generate information indicating an amount of virtual storage data of said bit stream memory.