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

Active Publication Date: 2010-09-01
NIPPON TELEGRAPH & TELEPHONE CORP
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Problems solved by technology

[0022] Therefore, according to the existing intra prediction, there is a problem that the increase of the residual signal cannot be avoided, and the compression efficiency deteriorates.
[0023] Therefore, in the existing intra prediction, when applied to an image whose value of the original signal varies spatially, that is, an image containing many layers (such an image is common), there is an increase in the resid

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  • Image encoding device and decoding device, image encoding method and decoding method, program for the devices and the methods, and recording medium recording program
  • Image encoding device and decoding device, image encoding method and decoding method, program for the devices and the methods, and recording medium recording program
  • Image encoding device and decoding device, image encoding method and decoding method, program for the devices and the methods, and recording medium recording program

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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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Abstract

A method for encoding an image using an intra-screen prediction comprises a step of selecting, from a plurality of gradient candidates, a gradient of pixel values indicated by an image signal to be predicted. Based on the gradient, a gradient is given according to the distance from a predicted reference pixel to generate a prediction signal. Based on the prediction signal, intra-screen encoding is performed on the image signal to be predicted and the information indicating the magnitude of the selected gradient is encoded. Alternatively, based on the already encoded image signal, a gradient of the pixel values indicated by the image signal to be predicted is estimated. Based on this gradient, a gradient is then given according to the distance from the predicted reference pixel to generate a prediction signal and based on this prediction signal, intra-screen encoding is performed on the image signal to be predicted.

Description

technical field [0001] The present invention relates to an image encoding device and its method for encoding an image using intraframe prediction, an image decoding device for decoding encoded data encoded by the image encoding technique and its method, for realizing the image encoding device An image encoding program and a computer-readable recording medium recording the program, an image decoding program for realizing the image decoding device, and a computer-readable recording medium recording the program. [0002] This application claims priority based on Japanese Patent Application Japanese Patent Application No. 2007-267614 for which it applied on October 15, 2007, and uses the content here. Background technique [0003] Intra predictive coding in which prediction is performed within the same frame cannot achieve as high a compression efficiency as inter predictive coding in which prediction is performed between different frames, so an intra predictive coding method wi...

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Application Information

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IPC IPC(8): H04N7/32H04N1/41H04N19/105H04N19/134H04N19/137H04N19/147H04N19/176H04N19/19H04N19/196H04N19/46H04N19/50H04N19/593H04N19/70
CPCH04N19/00545H04N19/00781H04N19/00303H04N19/00763H04N19/00042H04N19/00175H04N19/00139H04N19/00351H04N19/11H04N19/136H04N19/147H04N19/182H04N19/19H04N19/46H04N19/593H04N19/61
Inventor 松尾翔平高村诚之上仓一人八岛由幸
Owner NIPPON TELEGRAPH & TELEPHONE CORP
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