Patent ID: 8948251
Filing Date: 2015-02-03
Classification: H04N

Abstract:
1. Decoding apparatus for decoding an encoded stream, comprising: receiving means for receiving (a) the encoded stream which includes a current quantization scale calculated upon production of each data block of the encoded stream, and (b) history quantization scales utilized in more than two past encoding or decoding processes for each data block of the encoded stream; decoding means for decoding the received encoded stream utilizing the received current quantization scale to produce image data; and output means for outputting the history quantization scales, the current quantization scale and the image data produced by said decoding means for each data block so that, when the image data produced by said decoding means is re-encoded by a succeeding encoder, a largest quantization scale is selected by the succeeding encoder from the received history and current quantization scales as a utilization scale for re-encoding the image data, wherein the history and current quantization scales are included in the encoded stream, and said receiving means acquires the history and current quantization scales from the encoded stream.