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Image set level code rate control algorithm

A technology of bit rate control and image collection, applied in the field of image coding, can solve the problems of high transmission cost and storage cost

Active Publication Date: 2022-05-10
FUDAN UNIV
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Problems solved by technology

[0005]R, represents the encoding rate, which is the length of the code stream output by the encoder. The larger it is, the larger the file size of the code stream is, and the corresponding transmission cost and storage cost higher and vice versa

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  • Image set level code rate control algorithm

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[0032] Still take the output target PSNR as an example to introduce how to improve the implementation. In the actual process, if the output target is BPP, it is the same, just replace the mentioned PSNR with BPP. The specific method includes two steps, determining the encoding QP range. Search for the rate-distortion optimization parameter λ. After the rate-distortion optimization parameter λ is determined, the coding QP value corresponding to each picture is also determined.

[0033] (1) Determine the coding QP range:

[0034] (1) Initialize the coding quantization parameter QP to any valid value, such as 0 to 51 in HM, and 30 can be selected as the initial value. In the first encoding process, the initialized QP is used as an encoding parameter of each picture, so that the average PSNR and BPP of this set of pictures can be obtained when QP=30.

[0035] (2) Encode all pictures with the selected QP to obtain the encoding result of each picture, and calculate the average o...

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Abstract

The invention belongs to the technical field of image coding, and particularly relates to an image set level code rate control algorithm. By using the Lagrange function, a constrained code rate control problem is changed into an unconstrained problem, so that stepless adjustment output of dynamic BPP (bit per pixel) or PSNR (peak signal-to-noise ratio) is realized. Compared with the fixed BPP or PSNR value output by each picture, the method can obtain about 2% of BD-Rate gain.

Description

technical field [0001] The invention belongs to the technical field of image coding, and in particular relates to a code rate control algorithm suitable for image collection level. Background technique [0002] Bit rate control occupies a very important position in the encoder. From a subjective quality point of view, using rate control strategies can allocate more bit rates to areas that are more interesting to the human eye. From the perspective of objective quality, it can also allocate the code rate to the entire picture or a collection of pictures more reasonably under the same code rate conditions. The present invention will introduce a code rate control method in the picture collection domain that improves the objective quality. [0003] parameter definition [0004] D, represents coding distortion, which is a measure of the difference between the reconstruction result of the encoder / decoder and the original input video / image, and is often measured by PSNR (peak si...

Claims

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Application Information

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IPC IPC(8): H04N19/124H04N19/19
CPCH04N19/124H04N19/19
Inventor 范益波刘超
Owner FUDAN UNIV
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