CN106973292A - A kind of 3D HEVC inter prediction fast schema selection methods based on coloured image texture features - Google Patents

Abstract

The present invention relates to a 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics, which belongs to the field of video coding. The method includes analyzing the texture characteristics of coding units; judging the texture characteristics of coding units; and deciding whether to skip symmetrical segmentation according to the judging result and asymmetric split prediction modes. A fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics of the present invention can reduce the computational overhead of an encoder, and reduce the encoding time while keeping the encoding performance unchanged.

Description

A fast mode selection for 3D-HEVC inter-frame prediction based on color image texture characteristics choose method

technical field

The present invention relates to the field of video coding and decoding, in particular to a fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics suitable for stereoscopic video coding.

Background technique

In recent years, with the continuous development of multimedia technology, people have gradually begun to be dissatisfied with the sensory experience brought by flat video. Therefore, 3D video has gradually entered people's lives. The 3D video industry is developing very rapidly, and the coding standards of 3D video are constantly being updated and upgraded. In order to encode stereoscopic video more efficiently, the stereoscopic video coding standard 3D-HEVC based on HEVC (High Efficiency Video Coding) was proposed and developed in 2012. The 3D-HEVC video coding standard greatly reduces the redundancy of stereoscopic video by utilizing the correlation of time, space and components. Similar to traditional 2D video coding standards, 3D-HEVC also adopts flexible block size settings and various prediction modes that can be used. Each coding tree unit (Coding Tree Unit, CTU) is iteratively divided through a depth-first quadtree division method, so as to select the best division method. By traversing all prediction modes, the best prediction mode is obtained. Although the 3D-HEVC standard has a good coding effect, the excellent coding effect comes at the cost of huge computational complexity. This huge computational complexity seriously affects the real-time application of stereoscopic video coding technology. Therefore, in view of the high computational complexity of 3D-HEVC, it is important to study fast coding methods to reduce the computational overhead while maintaining the coding effect. meaning and value.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics suitable for stereoscopic video coding. The method has high computational complexity for the 3D-HEVC standard On the premise of keeping the encoding performance unchanged, the computational overhead of the encoder is effectively reduced.

The technical solution adopted by the present invention to solve its technical problems is:

A fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics, including:

receive input video;

Analyzing coding unit texture characteristics;

judging the texture characteristics of the coding unit;

Whether to skip the symmetric partition and the asymmetric partition prediction mode is determined according to the judgment result.

The analyzing the texture characteristics of the coding unit includes:

Extracting the pixel value of the pixel located on the main diagonal of the coding unit in the coding unit;

The texture characteristic of the coding unit is analyzed according to the pixel value of the pixel located on the main diagonal line.

The judging the texture characteristics of the coding unit includes:

Detect whether the pixels at the main diagonal position have obvious jumps. If the pixels at the main diagonal position have obvious jumps, the texture characteristics of the coding unit are judged as flat; if the pixels at the main diagonal positions do not have obvious jumps, the texture characteristics of the coding unit It was judged to be uneven. Specifically, through experiments and analysis, it is generally found that if there is no obvious jump in the pixel value of the main diagonal (that is, the pixel value does not change significantly), then the texture of the coding unit is often relatively flat, which means In this case, the checks for symmetric and asymmetric split modes can be skipped.

The method for detecting whether there is a significant jump in the main diagonal position pixel includes:

Given a preset threshold, calculate the difference between every two adjacent main diagonal pixels in turn;

If the difference between two adjacent main diagonal pixels is greater than the preset threshold, it is determined that the main diagonal pixels have obvious jumps.

The determining whether to skip the symmetric partition and the asymmetric partition prediction mode according to the judgment result includes:

If the texture property of the coding unit is flat, skip the check of the symmetric partition and the asymmetric partition mode when encoding the coding unit;

If the texture property of the coding unit is not flat, the coding unit is coded according to a standard 3D-HEVC coding method.

The present invention has following beneficial effect:

1. The solution is simple and feasible. It only needs to check the main diagonal pixel value of the coding unit before coding, without introducing too much additional computational complexity;

2. Make full use of the correlation between prediction mode and image texture. There is a certain correlation between the prediction mode and the image texture, and some prediction modes only have a better coding effect for the image block with a specific texture. This scheme makes full use of this correlation.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics of the present invention is not limited to the embodiments.

Description of drawings

Fig. 1 is a schematic flow sheet of the inventive method;

FIG. 2 is a pixel value diagram of pixels located on the main diagonal of the coding unit extracted from the coding unit according to the present invention.

detailed description

Referring to Fig. 1, in order to solve the problem of high computational complexity of the 3D-HEVC standard in the prior art, the present invention provides a fast mode selection method for 3D-HEVC inter-frame prediction based on color image texture characteristics, including:

Step 1, extracting the pixel values of the main diagonal pixels in a coding unit;

Specifically, the pixel value of the pixel located at the main diagonal position of the coding unit in the coding unit is extracted, as shown in Figure 2; in Figure 2, the black box represents the current coding unit, and the pixel located at the diagonal position of the box That is, the main diagonal position pixel;

Step 2, detect whether there is a significant jump in the pixel value of the main diagonal line, if there is a significant jump, go to step 3, otherwise go to step 4;

Specifically, the method for detecting whether there is an obvious jump in the pixel value of the main diagonal is:

Given a preset threshold (the threshold in this embodiment is set to 10), the difference between every two adjacent main diagonal pixels is calculated in turn, and if there is a difference greater than this threshold, the main diagonal is considered Pixels have noticeable jumps.

Step 3, encoding the coding unit according to a standard 3D-HEVC encoding method;

Step 4, skipping the checking of symmetric segmentation and asymmetric segmentation mode when encoding the coding unit;

Step 5, encode the next coding unit.

The above-mentioned embodiments are only used to illustrate the present invention, and are not used as limitations to the present invention. As long as it is based on the technical essence of the present invention, changes, modifications, etc. to the above-mentioned embodiments will fall within the scope of the claims of the present invention .

Claims (5)

1. A 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics, characterized in that, comprising: receive input video; Analyzing coding unit texture characteristics; judging the texture characteristics of the coding unit; Whether to skip the symmetric partition and the asymmetric partition prediction mode is determined according to the judgment result. 2. The 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics according to claim 1, wherein the analysis of coding unit texture characteristics comprises: Extracting the pixel value of the pixel located on the main diagonal of the coding unit in the coding unit; The texture characteristic of the coding unit is analyzed according to the pixel value of the pixel located on the main diagonal line. 3. The 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics according to claim 2, wherein said judging the texture characteristics of a coding unit comprises: Detect whether the pixels at the main diagonal position have obvious jumps. If the pixels at the main diagonal position have obvious jumps, the texture characteristics of the coding unit are judged as flat; if the pixels at the main diagonal positions do not have obvious jumps, the texture characteristics of the coding unit It was judged to be uneven. 4. The 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics according to claim 3, wherein the method for detecting whether the main diagonal position pixel has a significant jump comprises: Given a preset threshold, calculate the difference between every two adjacent main diagonal pixels in turn; If the difference between two adjacent main diagonal pixels is greater than the preset threshold, it is determined that the main diagonal pixels have obvious jumps. 5. The 3D-HEVC inter-frame prediction fast mode selection method based on color image texture characteristics according to claim 3 or 4, wherein the decision whether to skip the symmetric segmentation and asymmetric segmentation prediction modes according to the judgment result includes : If the texture property of the coding unit is flat, skip the check of the symmetric partition and the asymmetric partition mode when encoding the coding unit; If the texture property of the coding unit is not flat, the coding unit is coded according to a standard 3D-HEVC coding method.