Image predictive coding device, image predictive coding method, image predictive coding program, image predictive decoding device, image predictive decoding method and image predictive decoding program

Abstract

When generating an intra-frame prediction signal by means of an extrapolation method as used in the prior art, there are problems in that the prediction accuracy declines in relation to pixels which are situated distantly from the boundaries of an object block, and an image signal having a complex pattern cannot be predicted efficiently. A block divider 102 divides an input image into a plurality of regions. A prediction signal generator 103 generates a prediction signal for the pixel signal contained in an object region, which is the object of processing, among the plurality of regions, and generates a prediction signal by using a texture synthesis method for forming a texture signal for the object region. A subtracter 105 determines a residual signal between the pixel signal of the object region and the prediction signal, and a transformer 106 and a quantizer 107 encode the residual signal to generate a compressed 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 for predictive encoding and decoding using a texture synthesis method, 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. Background technique [0002] Compression coding technology is used to efficiently transmit and store still images and moving images. In the case of moving images, MPEG-1 to 4 or ITU (International Telecommunication Union: International Telecommunication Union) H.261 to H.264 systems are widely used. [0003] In these encoding methods, an encoding / decoding process is performed after div...

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Problems solved by technology

However, in bidirectional prediction, two motion vectors need to be coded in order to generate two prediction signals on the reproduction side. Therefore, when the number of averaged signals is increased to improve the smoothing effect of the prediction signal, the motion vector to be coded will also increase the number of

[0014] In addition, when an intra-screen prediction signal is generated by using the method of generating a prediction signal based on extrapolation adopted in the prior art, there is a problem that the prediction accuracy for pixels far from the boundary of the target block decreases.

and, Figure 18 The shown method of stretching pixel values ​​in a geometric direction has the problem of not being able to efficiently predict image signals with complex texture signals (patterns)

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