Patent ID: 6700933
Filing Date: 2004-03-02
Classification: H04N

Abstract:
A method for coding video data according to layered coding techniques in which the video data is represented as multi-layered frames, each frame having multiple layers ranging from a base layer of low quality to enhancement layers of increasingly higher quality, the method comprising:encoding a first bitstream representing a base layer; encoding a second bitstream representing one or more low quality enhancement layers, the encoding comprising: motion compensating an original image using the base layer as a reference to form a low quality predicted image, transforming the low quality predicted image to form low quality predicted coefficients, quantizing the low quality predicted coefficients to form quantized coefficients, dequantizing the quantized coefficients to form dequantized coefficients, deriving low quality residues as a difference between the low quality predicted coefficients and the dequantized coefficients, bit plane coding the low quality residues to form coded low quality residues, and compressing the coded low quality residues using variable length coding; and encoding a third bitstream representing one or more high quality enhancement layers based in part on values predicted from the base layer and the low quality enhancement layer.