Method and device for intra-frame mode prediction based on two-dimensional Hadamard transformation
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A technology of intra-frame mode and prediction method, which is applied in the field of video processing and can solve the problems of large hardware implementation area and high power consumption
Active Publication Date: 2013-04-03
TSINGHUA UNIV +1
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A huge number of 32×32, 16×16, 8×8 two-dimensional DCT / IDCT transformations bring a large number of multiplications, making the hardware implementation area large and power consumption high
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Embodiment 1
[0061] The present invention proposes a method for intra-frame mode prediction based on two-dimensional Hadamard transform, the flow chart of the method is as follows figure 1 As shown, the method includes:
[0062] S1. The optimal candidate mode in the preset frame and the optimal encoding cost corresponding to the optimal candidate mode;
[0063] S2. Select the candidate mode M corresponding to the prediction block k , computed in the candidate mode M k The following prediction results, where k=1, 2, 3...n, n is an integer, M k is the kth candidate mode of the prediction block;
[0064] For a prediction block PU, HEVC gives 35 candidate prediction modes. In intra mode prediction, the candidate mode M k Choose from these candidate prediction modes.
[0065] PU candidate mode M k After determination, according to the predictive value method provided by HEVC, the pixel values of the coded PU near the coded PU are used as reference data to perform interpolation to obtai...
Embodiment 2
[0108] The present invention also proposes a device for intra-frame mode prediction based on two-dimensional Hadamard transform, the device comprising:
[0109] A preset module 201, configured to preset the optimal candidate mode in the frame and the optimal encoding cost corresponding to the optimal candidate mode;
[0110] A selection module 202, configured to select a candidate mode M corresponding to the prediction block k , where, k=1, 2, 3...n, M k is the kth candidate mode of the prediction block;
[0111] Calculation module 203, for calculating the candidate mode M k The forecast results under;
[0112] The calculation module 203 is further configured to calculate the residual matrix of the original image corresponding to the prediction result and the prediction block;
[0113] A transformation module 204, configured to perform two-dimensional transformation on the residual matrix;
[0114] A quantization module 205, configured to quantize the transformation resul...
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Abstract
The invention provides a method and a device for intra-frame mode prediction based on two-dimensional Hadamard transformation. The method includes: S1, presetting an optimal coding cost Jbest; S2, selecting a candidate mode Mk corresponding to a prediction block, and computing a predication result under the candidate mode Mk; S3, computing a residual matrix of an original image corresponding to the predication result and the predication block, performing two-dimensional transformation for the residual matrix and quantifying a transformation result; S4, computing the distortion degree and the distortion rate under the candidate mode Mk after quantification, and computing the coding cost Jk under the candidate mode Mk; S5, comparing the Jk with the Jbest, if the Jk< the Jbest, the Jbest= the Jk, and the Mk serves as the optimal candidate mode, and if the Jk>=the Jbest, the Jbest and the optimal candidate mode corresponding to the Jbest are unchanged; and S6, repeating the steps from S2 to S5 until candidate modes of the predication block are traversed, so that the final optimal coding cost and the optimal candidate mode corresponding to the optimal coding cost are obtained. By the method, power consumption expenses and hardware area are reduced.
Description
technical field [0001] The present invention relates to the technical field of video processing, in particular to an intra-frame mode prediction method and device based on two-dimensional Hadamard transform. Background technique [0002] With the popularization of high-definition and ultra-high-definition video applications, users have higher and higher requirements for video compression performance due to the limitation of communication channel bandwidth and storage capacity. In order to obtain a higher compression ratio, the video codec standard makers choose lossy coding, and its goal is to obtain a larger compression ratio with a small loss of video quality. Against the above background, High Efficiency Video Coding (HEVC) came into being. Moving Pictures Experts Group (MPEG, Moving Pictures Experts Group / Motion Pictures Experts Group) and International Telecommunication Union Telecommunication Standardization Organization (ITU-T, ITU-T for ITU Telecommunication Standar...
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