PICTURE CODING DEVICE, PICTURE CODING METHOD, AND PICTURE CODING PROGRAM, AND TRANSMISSION DEVICE, TRANSMISSION METHOD, AND TRANSMISSION PROGRAM

摘要

PROBLEM TO BE SOLVED: To reduce the amount of code of a quantization parameter and improve the encoding efficiency.SOLUTION: There is provided a picture encoding device that encodes a picture and encodes a difference quantization parameter in a unit of a quantization coding block which is obtained by dividing the picture and is a management unit of a quantization parameter. A quantization parameter calculator 110 calculates a quantization parameter of the quantization coding block to be encoded. A prediction quantization parameter derivation unit 114 derives a prediction quantization parameter using the quantization parameters of a plurality of quantization coding blocks which precede the quantization coding block to be encoded in order of the encoding. A difference quantization parameter generator 111 derives a difference quantization parameter of the quantization coding block to be encoded, using a difference between the quantization parameter of the quantization coding block to be encoded and the prediction quantization parameter. A first bitstream generator 112 encodes the difference quantization parameter of the quantization coding block to be encoded.SELECTED DRAWING: Figure 1