Image prediction/encoding device, image prediction/encoding method, image prediction/encoding program, image prediction/decoding device, image prediction/decoding method, and image prediction decoding

Abstract

It is possible to provide an image prediction / encoding device, an image prediction / encoding method, an image prediction / encoding program, an image prediction / decoding device, an image prediction / decoding method, and an image prediction / decoding program which can select a plurality of candidate prediction signals without increasing an information amount. A weighting device (234) and an adder (235)perform a process (averaging, for example) of pixel signals extracted by a prediction adjacent region acquisition device (232) by using a predetermined synthesis method so as to generate a comparative signal for an adjacent pixel signal for each of combinations. A comparison / selection device (236) selects a combination having a high correlation between a comparison signal generated by the weighting device (234) and an adjacent pixel signal acquired by an object adjacent region acquisition unit (233). A prediction region acquisition unit (204), a weighting unit (205), and an adder (206) generate a candidate prediction signal and process it by using the predetermined synthesis method so as to generate a prediction signal.

Description

Technical field [0001] The present invention relates to an image predictive encoding device, an image predictive encoding method, an image predictive encoding program, an image predictive decoding device, an image predictive decoding method, and an image predictive decoding program, in particular to an image predictive encoding device that uses an image synthesis method to perform predictive encoding and decoding, Image predictive encoding method, image predictive encoding program, image predictive decoding device, image predictive decoding method, and image predictive decoding program. Background technique [0002] In order to efficiently transmit and accumulate still image and moving image data, compression coding technology is used. In the case of moving images, MPEG-1 to 4 or ITU (International Telecommunication Union) H.261 to H.264 are widely used. [0003] In these encoding methods, encoding / decoding processing is performed after dividing an image to be encoded into a plura...

AI Technical Summary

Problems solved by technology

[0011] In the prior art, the prediction signal of each pixel is generated by duplicating the reproduced pixel value containing distortion caused by coding (such as quantization noise), so the prediction signal also contains coding distortion

In this way, the prediction signal mixed with coding distortion becomes the main cause of the decrease in coding efficiency, such as the increase in the coding amount of the residual signal and the deterioration of the reproduction image quality.

[0012] The influence of coding distortion can be suppressed by smoothing the prediction signal, but additional information indicating a plurality of candidate prediction signals to be smoothed is required, and the amount of information increases.

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