Rate control bit allocation method based on saliency

A technology of bit allocation and bit rate control, applied in the field of image processing, can solve the problems of ignoring the relationship between image content, people's attention shift, and the quality of non-interested areas, and achieve the effect of ensuring quality and ensuring quality

Active Publication Date: 2017-01-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Although this method can reflect its final coded bits to a certain extent, it ignores the relationship between image contents, and cannot guarantee the quality of the areas that people generally care about in the image is protected when the bandwidth is limited.
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  • Rate control bit allocation method based on saliency
  • Rate control bit allocation method based on saliency
  • Rate control bit allocation method based on saliency

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] The following embodiments apply the method of the present invention to the rate control method of the latest HEVC encoding framework, and the specific operation process is as follows figure 1 Shown:

[0033] ① Read the current coded frame and calculate the saliency map of the current frame;

[0034] ② According to the saliency map of the current frame, calculate the saliency value of each LCU, and the saliency value is the weighted average of the saliency values ​​in the corresponding LCU;...

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Abstract

The invention provides a rate control bit allocation method based on saliency. The method comprises the following steps: computing each frame of image, so as to obtain a saliency map of each frame of image; computing the saliency weighted average of each maximum coded unit according to the saliency map of each frame of image; performing target bit allocation on each coded unit according to the ratio of the weighted average of each maximum coded unit to a saliency map of an uncoded unit; acquiring a lagrangian multiplier based on saliency through the introduction of approximate saliency distortion of an original image and a reconstructed image; adjusting subsequent frame-level bit allocation, so as to realize a rate control function. The method takes the fact that saliency maps guide the bit allocation of a current frame and distortion situation based on saliency before and after coding into account, thereby achieving guiding effect on the frame-level rate control of a subsequent frame, and capable of realizing rate control based on saliency in a maximum coded unit level and image level.

Description

technical field [0001] The invention relates to a method in the technical field of image processing, in particular to a significance-based code rate control bit allocation method. Background technique [0002] Video compression has made great progress in the past few decades. From the early H.261 to today's H.264 and HEVC, the video coding technology has evolved from generation to generation, and the coding structure of the hybrid coding framework has been roughly established. The evolution of various module technologies has greatly improved the performance of video encoding. The latest HEVC has achieved the requirement of 50% performance improvement compared with the previous generation encoder H.264. [0003] In the field of real-time communication, such as video conferencing, video streaming consumes a large amount of bandwidth. When the bandwidth itself is limited, the quality of the video will be seriously affected. To solve the problem of limited bandwidth, precise bi...

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Application Information

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IPC IPC(8): H04N19/167H04N19/115H04N19/147
CPCH04N19/115H04N19/147H04N19/167
Inventor 宋利白立勋解蓉
Owner SHANGHAI JIAO TONG UNIV
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