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Interframe predication quick mode selecting method for high-performance video coding

A video coding and inter-frame prediction technology, applied in the field of video coding, can solve the problems of high complexity at the coding end, inability to apply real-time requirements, and applications that cannot meet the strict real-time requirements of mobile devices, so as to ensure coding compression performance, low-complexity effects

Active Publication Date: 2015-05-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods can save a certain amount of time, they still cannot meet the needs of applications with strict real-time requirements such as mobile devices.
[0007] To sum up, the mode selection method of the HEVC standard in the prior art has high complexity at the encoding end and cannot be applied to applications with strong real-time requirements.

Method used

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  • Interframe predication quick mode selecting method for high-performance video coding
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  • Interframe predication quick mode selecting method for high-performance video coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] image 3 It is a flow chart of a fast mode selection method for inter-frame prediction of high-performance video coding provided by Embodiment 1 of the present invention. Such as image 3 As shown, it mainly includes the following steps:

[0022] Step 31 , check the SKIP mode and the Inter2Nx2N mode for each coding unit CU in the video frame.

[0023] In order to facilitate subsequent mode verification, the current 2Nx2N block can usually be further divided in advance. For example, the current CU unit can be divided into 4 small parts (such as figure 1 The division shown is divided into 4 subunits), which is beneficial to combine these four small parts to form the type of PU, such as 2NxN and Nx2N.

[0024] Step 32. Determine whether at least one of the following conditions is met: the error between the reconstructed pixel and the original pixel value of the CU unit does not exceed a threshold, the distribution of the error between the reconstructed pixel and the or...

Embodiment 2

[0068] According to the method described in Embodiment 1, compared with the existing HEVC standard, it can be seen from the comparison results that the solution of Embodiment 1 of the present invention can save a lot of time while ensuring that the PSNR (Peak Signal-to-Noise Ratio) drops within an acceptable range. time, thereby improving coding efficiency. The comparison results are shown in Table 1:

[0069]

[0070] The scheme of table 1 embodiment one and the comparative result of prior art

[0071] Among them, ΔB represents the percentage of code rate increase, ΔP represents the reduction of PSNR, and ΔT represents time saving; the test condition RA main is the main test condition of random access (RA) in the public test conditions set by the HEVC standard, The conditions are: the data of the video frame is 8-bit precision, that is, the value of each pixel is 0 to 255; 8 frames of video content are used as a group of encoded images, that is, every 8 frames are encoded...

Embodiment 3

[0075] According to the method described in the first embodiment, compared with the fast algorithm adopted by the existing HEVC, it can be seen from the comparison results that the solution in the first embodiment of the present invention can ensure that the PSNR decline is negligible and save a lot of time, thereby improving the coding efficiency . The comparison results are shown in Table 2:

[0076]

[0077] The scheme of table 2 embodiment one and the comparison result of prior art

[0078] Wherein, the test conditions and symbols are the same as those in Example 2. The prior art schemes used in this comparison are scheme 1) and scheme 2) which are improved on the original scheme mentioned in the background art.

[0079] From the comparison results shown in Table 2, it can be seen that the solution in Example 1 is far superior to the solution in the prior art. For example, in the results of the average resolution size, it can be guaranteed that the encoding bit rate ...

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Abstract

The invention discloses an interframe predication quick mode selecting method for high-performance video coding. The method comprises the steps of conducting SKIP mode and Inter2Nx2N mode verification on each coding unit (CU) in video frames, judging whether the SKIP mode is a current optimized mode or not if the error of the rebuilt pixel and the original pixel value of each CU unit does not surpass a threshold, or the error of the rebuilt pixel and the original pixel value is distributed in a preset range or predicted residuals do not surpass preset numerical value, judging the SKIP mode as the optimized mode of the current CU if SKIP mode is the current optimized mode, otherwise, judging whether the the current CU is a smallest coding unit (SCU) or not, conducting four quad tree based segmentation on the current CU if the current CU is not an SCU, and conducting mode verification on sub-units one by one. The method effectively reduces coding complexity of a coding side so as to be adapted to mobile equipment and much video application high in real-time requirement.

Description

technical field [0001] The invention relates to the technical field of video coding, in particular to a fast mode selection method for inter-frame prediction of high-performance video coding. Background technique [0002] In order to facilitate the application of video coding, many international and domestic organizations are committed to developing video coding standards. For example, the main international video coding standards include H.261 and H. .263. And MPEG-1 and MPEG-4 developed by ISO / IEC (International Organization for Standardization / International Electrotechnical Commission). And H.262 and H.264 jointly formulated by the two organizations. In order to meet the growing demands of video applications, especially the demands of high-definition video compression, ITU-T and ISO / IEC are currently jointly formulating the next-generation video coding standard—HEVC standard. [0003] The purpose of video compression is to remove various redundancies in the video seque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/103H04N19/96H04N19/557
Inventor 李厚强张金雷
Owner UNIV OF SCI & TECH OF CHINA
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