A Method for Controlling Quality Sweet Spots in Video Communications
A technology for video communication and quality, applied in the fields of digital video signal modification, image communication, selective content distribution, etc., can solve the problems of lack of unified planning of coding resources and inability to obtain balanced effects.
Active Publication Date: 2018-04-20
宁波菊风系统软件有限公司
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These common practices often lack a unified planning of coding resources, and sometimes cannot get the best balance effect
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[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0049] This embodiment is aimed at the video communication of H.264 encoding, finds the method of video communication quality sweet spot, the method for other video coded video communication quality sweet spot is the same, selects parameter value to be different;
[0050] First, a temporal and spatial quality model function CEV is proposed:
[0051] CEV=SMOS α *TMOS
[0052] Among them, SMOS is the spatial quality score function, TMOS is the time quality score function, α is the weight of the spatial quality score function, α=1.8;
[0053] The spatial quality score function is:
[0054] where m 1 = 1.5001, m 2 =6.9038,m 3 =-0.0097, m 4 = 1.1195; R base =352*288; R indicates the encoding frame resolution, Br indicates the code rate given by the available bandwidth of the network, and F indicates the encoding frame rate;
[0055] The te...
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The invention relates to a method for controlling a video communication quality sweet spot. The method is characterized by comprising the following steps: establishing a quality model function CEV:CEV=f{R, F, Br} of time and space, wherein R represents coded frame resolution, Br represents a code rate given by a network available bandwidth, F represents a coded frame rate, and f is the quality model function; deriving the quality model function CEV of time and space to obtain appropriate code rates Br corresponding to different coded frame resolutions F and coded frame rates F, and generating a video coding configuration table relevant to R, F and Br; and inquiring the video coding configuration table according to a resolution required by a receiving end, and inquiring a corresponding target coded frame rate under the situation of the code rate given by a practical network available bandwidth in order to obtain the video communication quality sweet point. Through adoption of the method, the quality sweet point can be found in a global scope, and best video subjective quality experience can be obtained under the given code rate.
Description
technical field [0001] The present invention relates to a method of controlling video communication quality sweet spots. Background technique [0002] In real-time video communication, the available bandwidth of the network often changes, and the sender adjusts the encoding compression rate according to the available bandwidth to dynamically adapt to network changes. However, at a given bit rate, how does the sender allocate time and space resources for encoding to achieve the best subjective quality? That is, at a specific encoding rate (bit rate: the size of the encoded output per unit time), how to find the quality sweet spot (quality sweet spot: refers to setting a reasonable resolution and frame rate under a given bit rate and screen size) to get the best video subjective quality experience)? The usual practice is to adjust the coding quantization parameter (hereinafter referred to as QP value) to control the code rate. For example, the QP value range of H.264 is 1 to...
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IPC IPC(8): H04N19/146H04N21/2662
CPCH04N21/2662
Inventor 钱晓炯董泽张仝辉周芳冰
Owner 宁波菊风系统软件有限公司