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Spatial prediction based intra coding

A spatial prediction and coding technology, applied in the field of image coding

Inactive Publication Date: 2005-08-24
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0115] The above approach has one major drawback - memory is required to keep the ordering of the prediction modes for block C given the prediction modes of blocks U and L

Method used

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Experimental program
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Embodiment Construction

[0129] One embodiment of the invention exploits the property that it is possible to obtain an ordered list of prediction modes for one combination of prediction modes of neighboring blocks as a function of another combination of prediction modes. For illustration purposes, as shown in Fig. 3, the prediction modes of two neighboring blocks U and L are used to infer the prediction of the current block C. Note that the combination of prediction modes in FIG. 4a can be obtained by diagonally flipping the prediction modes as shown in FIG. 4b. Therefore, when using the mode combination in Fig. 4a, the nth most probable prediction mode for block C should be the same as the "diagonally flipped", nth most probable prediction mode of the mode combination in Fig. 4b. Thus, if said neighboring blocks U and L have modes "vertical" and "vertical", then the prediction mode of the current block C is most likely "vertical" (Fig. 4b). So when the blocks are flipped or mirrored relative to the ...

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Abstract

A method (100) and device (90) for coding a digital image using intra-mode block prediction, wherein a list of prediction modes for each combination of prediction modes of the neighboring (U, L) blocks is obtained. The modes assigned to each combination of prediction modes may be divided into two groups. The first group includes n (where n is smaller than the overall number of available modes) most probable prediction modes and the second group includes the remaining modes. The modes in the first group are ordered according to their probability. This order may be specified as a list of modes ordered from most probable to the least probable mode. The modes belonging to the second group may be ordered in some predetermined manner, which may be specified depending on the information already available to the decoder (60).

Description

technical field [0001] The present invention relates generally to image coding, and in particular to coding blocks of image frames. Background technique [0002] A digital image such as a video image, a TV image, a still image, or an image generated with a video recorder or a computer is composed of pixels arranged in horizontal and vertical rows. The number of pixels in a single image is typically in the tens of thousands. Each pixel typically contains luminance and chrominance information. Without compression, the amount of information transferred from the image encoder to the image decoder is so large that real-time image transmission is not possible. In order to reduce the amount of information transmitted, many different compression methods have been developed, such as JPEG, MPEG and the H.263 standard. In a typical video encoder, the frames of the original video sequence are divided into rectangular regions or blocks, which are encoded in Intra-mode (I mode) or Inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H03M7/36H04N1/41H04N7/26H04N19/593
CPCH04N19/00375H04N19/00278H04N19/00763H04N19/00042H04N19/00024H04N19/00551H04N19/00369H04N19/197H04N19/105H04N19/176H04N19/196H04N19/593H04N19/11H04N19/463H04N1/41H04N1/46G06V10/20
Inventor M·卡策维茨
Owner NOKIA TECHNOLOGLES OY