Patent ID: 6084636
Filing Date: 2000-07-04
Classification: H04N

Abstract:
A method for encoding a video signal including a quantization-dependent signal and a quantization-independent signal, comprising the steps of:(a) quantizing the quantization-dependent signal base on a fixed quantization parameter to thereby generate first quantized data;(b) statistically coding the first quantized data and the quantization-independent signal to thereby provide first data and second data, respectively;(c) storing the amount of the first data and the amount of the second data;(d) determining a target amount of encoded bits for each of predetermined units of the video signal based on a predetermined target bit rate and the stored amounts of the first and the second data;(e) deciding one or more quantization parameters for each unit based on the target amount of encoded bits;(f) quantizing the quantization-dependent data based on the decided quantization parameters to thereby generate second quantized data; and(g) statistically coding the second quantized data and the quantization-independent signal to thereby generate third data and fourth data, respectively, as the encoded data of the video signal,wherein the quantization parameters are adaptively decided in response to the difference between the target amount of encoded bits and the amount of the encoded data.