Method and apparatus for operational frame-layer rate control in video encoder
A technology of a video encoder and a control device, which is applied in the field of bit rate control of a video encoder, and can solve problems such as inability to ensure accuracy and decrease in efficiency of bit rate control of residual signals in micro-blocks, and achieve the effect of ensuring accuracy
Inactive Publication Date: 2007-01-10
MEDIATEK INC
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[0007] Therefore, it can be seen that the estimation method described above operates under a stable video sequence, but if the video sequence has frames with variable characteristics, the accuracy of the above-mentioned known method cannot be guaranteed, because the micro-block Inaccurate estimation of the variance of the mean and / or residual signal can degrade the performance of bit rate control
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[0033] With regard to H.264 bit rate control, the interdependence between rate and distortion optimization (RDO) and bit rate control will cause two major problems: first, as the above known technical documents and their related algorithms As mentioned above, the residual signal and its related information (such as micro-block average difference (MAD) and variation) have not been calculated when performing bit rate and distortion optimization calculations; secondly, the header information (such as macro Block Mode, Motion Vectors and Reference Frames) have not yet been computed when performing bitrate and distortion optimization. It can be seen that the number of header bits used to encode the header information cannot be accurately estimated.
[0034] Although there are various H.264 encoder schemes that use bit rate control algorithms to solve the interdependence between bit rate and distortion optimization and bit rate control, these schemes do not completely solve all bit ...
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A frame-layer rate control method, and a video encoding method and system. In a first-step encoding stage, a QP of a previous frame is used to determine MVs and MB modes for all MBs in a current frame through R-D optimization, and the residual signal is encoded and then decoded for intra prediction. The residual signal is stored and the number of header bits is estimated from the determined MB modes and MVs. Given a target bit-rate for the current frame, a new QP is determined by a rate model. In a second-step encoding stage, the residual signal is encoded and reconstructed for both intra-prediction of subsequent MBs and inter prediction of subsequent frames using the new QP.
Description
technical field [0001] The present invention relates to bit rate control of a video encoder based on block operation, especially a method and device for frame-layer bit rate control in an H.264 video encoder. Background technique [0002] With the development of various video compression standard technologies, video audio and video systems are widely used in various fields, such as video telephony, video conferencing, and various video transmission systems. Generally speaking, the technologies of the above video coding standards are nothing more than discrete cosine transform (discrete cosine transform, DCT), motion estimation (motion estimation, ME) or motion compensation (motion compensation, MC), quantization and variable length coding ( variable length coding, VLC). In the quantization process, the used quantization parameter (quantization parameter, QP) (which corresponds to a quantization step size) is an important encoding parameter, because the quantization paramete...
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IPC IPC(8): H04N7/24
CPCH04N19/00781H04N19/00278H04N19/00181H04N7/2617H04N19/00266H04N19/00175H04N19/00018H04N19/0009H04N19/103H04N19/124H04N19/147H04N19/149H04N19/172H04N19/176H04N19/61
Inventor 权度暻沈美吟郭宗杰
Owner MEDIATEK INC