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Method for acquiring pixel prediction value in intraframe prediction

A technology for intra-frame prediction and pixel prediction, which is used in image communication, television, electrical components, etc., and can solve problems such as the influence of the accuracy of prediction results, and achieve the effect of improving accuracy.

Active Publication Date: 2011-12-14
HONG KONG APPLIED SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the predicted direction deviates from the directions determined by the above nine angles, a direction will be selected for prediction based on the proximity to the directions determined by the above nine angles, and the accuracy of the prediction results will be affected

Method used

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  • Method for acquiring pixel prediction value in intraframe prediction
  • Method for acquiring pixel prediction value in intraframe prediction
  • Method for acquiring pixel prediction value in intraframe prediction

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0037] In this specific embodiment, a method for obtaining a pixel prediction value in intra prediction includes the following steps:

[0038] 1) Determine the current block to be intra-frame predicted, and the size of the current block selected in this embodiment is 4 pixels×4 pixels.

[0039] 2) Determine the adjacent blocks of the current block.

[0040] 3) Determine the pixel prediction value of each pixel in the current block according to the condition of the adjacent block in step 2).

[0041] When the position of the current block is different, its adjacent blocks are also different. Such as image 3 As shown, C represents the current block. In the first case, the current block C is located at the intersection of the first row and the first column, then the adjacent blocks of the current block C do not exist. In the second case, the current block C has only adjacent left blocks. In the third case, the current block C only has adjacent upper blocks and upper right b...

specific Embodiment approach 2

[0061] In this specific embodiment, a method for obtaining a pixel prediction value in intra prediction includes the following steps:

[0062] 1) Determine the current block to be intra-frame predicted.

[0063] 2) Determine an edge passing area in the current block, the edge passing area divides the current block into a first area, a second area and a third area, the third area corresponds to the edge passing area, the first area and the second area Corresponding to the regions on both sides of the third region respectively. Such as Figure 8 As shown, R3 in the figure represents the third region, R1 represents the first region, and R2 represents the second region.

[0064] Preferably, refer to Figure 8, determine the region R3 as follows. Establish a coordinate system with the center of the current block as the origin; determine a center line, which is characterized by the following two parameters: the distance parameter ρ, which represents the vertical distance from th...

specific Embodiment approach 3

[0085] The difference between this specific embodiment and the second embodiment is that in this specific embodiment, the pixel prediction corresponding to the three regions does not use the 9 prediction modes in the prior art for prediction, but uses the acquisition method in the first specific embodiment. The method of pixel prediction value predicts the three regions respectively.

[0086] In this specific embodiment, a method for obtaining a pixel prediction value in intra prediction includes the following steps:

[0087] 1) Determine the current block to be intra-frame predicted.

[0088] 2) Determine an edge passing area in the current block, the edge passing area divides the current block into a first area, a second area and a third area, the third area corresponds to the edge passing area, the first area and the second area Corresponding to the regions on both sides of the third region respectively. Such as Figure 8 As shown, R3 in the figure represents the third r...

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Abstract

The invention discloses a method for acquiring pixel prediction value in intraframe prediction, the method comprises leading a straight line in any direction along between 0 and 180 degrees; performing the intraframe prediction in a plurality of any directions on a current block by combining adjacent pixels determined by the straight line; finally, selecting the pixel prediction value in the direction corresponding to the minimum rate distortion expense combining the rate distortion expense as the final determined pixel prediction value. Because of the prediction direction in the prediction course is the any direction between 0 and 180 degrees, by controlling the precision, the precision is smaller, the selected prediction direction amount is larger, accordingly, the probability of most accurate prediction direction in the intraframe prediction is larger, the probability of the pixel prediction value closest to the true block which is determined at last is larger, thereby improving the accuracy of the prediction.

Description

technical field [0001] The present invention relates to intra-frame prediction, in particular to a method for obtaining pixel prediction values ​​in intra-frame prediction. Background technique [0002] In the current H.264 video coding standard, the prediction of the pixel value uses the available pixels in the adjacent blocks of the current block to perform intra-frame prediction. From these adjacent row and adjacent column pixels, different directional intra prediction modes or DC prediction modes can be selected. The H.264 standard includes 9 intra-frame prediction modes based on blocks / sub-blocks with specifications of 4 pixels×4 pixels or 8 pixels×8 pixels, and 4 types of intra-frame prediction with macroblocks with specifications of 16 pixels×16 pixels model. [0003] Figure 1a Pixels A-M available in a sub-block of size 4 pixels by 4 pixels and its adjacent blocks are shown. Adjacent blocks include left block, upper block, upper right block and upper left block, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N19/105H04N19/147H04N19/593
Inventor 邹峰区子廉杨雯刘雨
Owner HONG KONG APPLIED SCI & TECH RES INST