A code rate model updating method and device
A model update and bit rate technology, applied in the field of video coding, can solve the problems of inaccurate bit rate model update and low bit rate control accuracy, and achieve the effect of improving accuracy and accurate updating.
Active Publication Date: 2019-05-10
深圳市沉浸视觉科技有限公司
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[0004] In view of this, the object of the present invention is to provide a code rate model update method and device to solve the problem in the prior art that the code rate model update is not accurate enough, resulting in reduced accuracy of code rate control
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[0034] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments of this specification, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0035] figure 1 It is a schematic flowchart of a code rate model updating method provided by an embodiment of the present invention. The method specifically may include the following steps:
[0036] Step S101, use the control parameter set to encode a control unit according to the determined encoding mode, obtain the transformation block obtained by...
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The invention provides a code rate model updating method and device, and the method comprises the steps: the coding of a control unit is carried out through employing a control parameter set, the transformation block of each block in a corresponding coding mode is obtained, and the coding bit number of the control unit is determined; One or more virtual control parameter sets nearby the control parameter set are determined, transform blocks are quantized through the virtual control parameter set, and all the virtual quantized blocks corresponding to each virtual control parameter set form a virtual quantized block set; Entropy coding is carried out on the virtual quantized blocks respectively, or an approximation algorithm is used for estimating the virtual quantized blocks respectively, and a virtual coding bit number corresponding to each virtual quantized block set is obtained; And the code rate model is updated by using the control parameter set, the virtual control parameter set,the coding bit number and the virtual coding bit number. According to the technical scheme, the code rate model can be updated more accurately, and the code rate control accuracy is improved.
Description
technical field [0001] This description relates to the technical field of video coding, and in particular to a method and device for updating a code rate model. Background technique [0002] Rate control is an important technology in the field of video coding, and its purpose is to adjust some control parameters related to coding. By adjusting the control parameters, when coding the control unit as a coding unit, the code rate of the generated code stream can reach or approach the preset code rate. In most code rate control algorithms, a certain code rate model is set, and the relationship between the number of coded bits of the control unit and the control parameters is obtained according to the code rate model, so as to use this relationship to meet the predetermined code rate requirements. Due to the great difference between different video sequences, a fixed code rate model cannot fit all video sequences well. To avoid this problem, the code rate model is usually update...
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IPC IPC(8): H04N19/124H04N19/13H04N19/176H04N19/184H04N19/70
Inventor 王振宇韩冰杰李旭峰
Owner 深圳市沉浸视觉科技有限公司