Image encoding device and decoding device, image encoding method and decoding method, program for the devices and the methods, and recording medium recording program
An image coding and image decoding technology, applied in image communication, television, electrical components, etc., can solve the problems of increased residual signal, unavoidable residual signal increase, and deterioration of compression efficiency, and achieve the effect of improving compression efficiency
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[0123] In the present invention, instead of directly using the signal value of the reference pixel as a prediction signal, a slope is added, whereby intra prediction with less prediction error can be realized.
[0124] That is, as figure 1 As shown, it is assumed that the encoding target block includes a gradation. In this case, in the present invention, as figure 1 As shown in the lower level of , by adding a certain slope to the prediction signal, a prediction signal close to the original signal is generated, whereby the residual signal can be reduced, and the efficiency of intra prediction can be improved.
[0125] In the existing intra prediction, such as figure 1 As shown above, since the value of the reference pixel is directly applied to the prediction pixels in all the prediction directions, when the original signal has spatially varying levels, the increase in prediction error cannot be avoided.
[0126] On the other hand, in the present invention, by adding a s...
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