Patent ID: 6259739
Filing Date: 2001-07-10
Classification: H04N

Abstract:
A moving picture variable bit rate coding apparatus receiving digitized moving pictures, and subjecting the pictures to a coding processing according to a variable bit rate method, in a real time processing in response to the input of the picture, to generate bit streams, said coding apparatus comprising:a blocking means for dividing each picture included in the input moving picture into blocks to generate blocked data;a picture conversion means for subjecting the blocked data to conversion processing to generate a conversion coefficient;a quantization means for performing quantization processing to the conversion coefficient using a quantification scale to generate a quantized conversion coefficient;a bit stream generating means for generating bit stream from the quantized conversion coefficient; anda code quantity control means for setting a function for control, using a generated code quantity which is a quantity of bit stream generated in a unit time and an average quantization scale obtained as a value indicating an average of the quantization scales per unit time, and, by arithmetic operation using the set function, obtaining a quantization scale to be used for the quantization processing and then outputting the quantization scale to the quantization means.