Picture coding apparatus and picture coding method

Details Picture coding apparatus and picture coding method Picture coding apparatus and picture coding method

2006-12-19

2006-12-19

Wu, Jingge (Department: 2624)

Image analysis

Image compression or coding

Interframe coding

C382S239000, C382S246000, C382S250000, C375S240200, C375S240160, C375S240220

Reexamination Certificate

active

07151856

ABSTRACT:
A frame group target bits number calculating unit (31) reads the total number of bits on frame group basis allocatable to residual frames from a storing unit (36), updates subtracting the number of generated bits used to code a preceding frame, and transmits to a next frame target bits number calculating unit (32). The next frame target bits number calculating unit (32) calculates the target number of bits to be allocated to a next frame based on the received total number of bits and the number of residual frames with considering a frame rate value, Rf. An average frame bits number calculating unit (33) calculates the average number of bits allocated to preceding frames. A calculating unit (34) multiplies the calculated average number of bits by a predetermined coefficient, compares the resulting value with above target number of bits, selects the greater number and transmits it to a quantization step calculating unit (35).

REFERENCES:
patent: 6748020 (2004-06-01), Eifrig et al.
patent: 2002/0122598 (2002-09-01), Ribas-Corbera et al.
patent: 2003/0063806 (2003-04-01), Kim et al.
patent: 2000-308047 (2000-11-01), None
patent: 2001-025015 (2001-01-01), None

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