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公开(公告)号：US11012701B2
公开(公告)日：2021-05-18
申请号：US16796928
申请日：2020-02-20
申请人： Tencent America LLC
IPC分类号： H04N19/44 , H04N19/46 , H04N19/70 , H04N19/149 , H04N19/132 , H04N19/176
摘要： A method of video decoding performed in a video decoder is provided. A bit stream including syntax elements is received. The syntax elements correspond to coefficients of a region of a transform skipped block in a coded picture. The syntax elements include a first flag indicating whether an absolute coefficient level of one of the coefficients is greater than 0, and a second flag indicating a parity of the absolute coefficient level of the one of the coefficients. The second flag is decoded based on an equal probability model.
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公开(公告)号：US11006124B2
公开(公告)日：2021-05-11
申请号：US16889962
申请日：2020-06-02
IPC分类号： H04N19/117 , H04N19/147 , H04N19/182 , H04N19/149 , H04N19/82 , H04N19/176
摘要： The disclosure provides a sample adaptive offset (SAO) encoder. The SAO encoder includes a statistics collection (SC) block and a rate distortion optimization (RDO) block coupled to the SC block. The SC block receives a set of deblocked pixels and a set of original pixels. The SC block categorizes each deblocked pixel of the set of deblocked pixels in at least one of a plurality of band and edge categories. The SC block estimates an error in each category as difference between a deblocked pixel of the set of deblocked pixels and corresponding original pixel of the set of original pixels. The RDO block determines a set of candidate offsets associated with each category and selects a candidate offset with a minimum RD cost. The minimum RD cost is used by a SAO type block and a decision block to generate final offsets for the SAO encoder.
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公开(公告)号：US10999581B2
公开(公告)日：2021-05-04
申请号：US16850509
申请日：2020-04-16
发明人： Kai Zhang , Li Zhang , Hongbin Liu , Jizheng Xu , Yue Wang
IPC分类号： H04N19/149 , H04N19/105 , H04N19/132 , H04N19/176 , H04N19/186 , H04N19/30 , H04N19/593 , H04N19/159 , H04N19/11 , H04N19/50
摘要： A method for video processing is provided. The method includes determining, for a conversion between a current video block of a video that is a chroma block and a coded representation of the video, parameters of a cross-component linear model based on R chroma samples from a group of neighboring chroma samples, wherein the R chroma samples are selected from the group based on a position rule; and performing the conversion based on the determining and R is greater than or equal to 2.
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公开(公告)号：US10924738B2
公开(公告)日：2021-02-16
申请号：US16169674
申请日：2018-10-24
申请人： Arm Limited
IPC分类号： H04N19/124 , H04N19/103 , H04N19/18 , H04N19/625 , H04N19/176 , H04N19/14 , H04N19/149
摘要： When encoding an array of data elements using an encoding process that generates an array of quantized frequency domain coefficients corresponding to an array of difference values between a source block of data elements of the array of data elements being encoded and a reference block of data elements, a bit count value for encoding an array of quantized frequency domain coefficients to be used to select whether to encode the source block in accordance with a particular set of encoding options is estimated by estimating a bit count value for encoding the locations of the non-zero quantized frequency domain coefficients in the array of quantized frequency domain coefficients based on the number of non-zero frequency domain coefficients in the array of quantized frequency domain coefficients.
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公开(公告)号：US10855988B2
公开(公告)日：2020-12-01
申请号：US16226594
申请日：2018-12-19
发明人： Guoxin Jin , Xianglin Wang
IPC分类号： H04N19/149 , H04N19/139 , H04N19/11 , H04N19/159 , H04N19/132 , G06N20/10 , H04N19/172
摘要： Systems, methods, and computer-readable media are described for providing improved video or image encoding, including adaptive prediction structures for encoding video frames. In some examples, systems, methods, and computer-readable media can include obtaining a sequence of frames; determining, based on frame statistics associated with a first frame in the sequence of frames, a prediction structure for encoding the sequence of frames, the prediction structure defining an order in which frames in the sequence of frames are encoded and a prediction distance representing a maximum distance permitted between referencing frames and reference frames in the sequence of frames, and the frame statistics indicating an amount of motion in the first frame. The systems, methods, and computer-readable media can also include encoding one or more of the sequence of frames based on the prediction structure.
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公开(公告)号：US20200334535A1
公开(公告)日：2020-10-22
申请号：US16918436
申请日：2020-07-01
申请人： WaveOne Inc.
发明人： Oren Rippel , Lubomir Bourdev
IPC分类号： G06N3/08 , G06N3/04 , G06N20/00 , G06K9/00 , G06K9/62 , G06K9/46 , H04N19/126 , H04N19/167 , H04N19/172 , H04N19/196 , H04N19/91 , H04N19/44 , G06K9/66 , G06T5/00 , H04N19/13 , H04N19/149 , H04N19/18 , H04N19/48 , H04N19/154 , H04N19/33
摘要： A deep learning based compression (DLBC) system applies trained models to compress binary code of an input image to a target codelength. For a set of binary codes representing the quantized coefficents of an input image, the DLBC system applies a first model that is trained to predict feature probabilities based on the context of each bit of the binary codes. The DLBC system compresses the binary code via adaptive arithmetic coding based on the determined probability of each bit. The compressed binary code represents a balance between a reconstruction quality of a reconstruction of the input image and a target compression ratio of the compressed binary code.
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公开(公告)号：US10791333B2
公开(公告)日：2020-09-29
申请号：US15855450
申请日：2017-12-27
IPC分类号： H04N19/87 , H04N19/196 , H04N19/30 , H04N19/149 , H04N19/124 , H04N19/187 , H04N19/33 , H04N19/174 , H04N19/31 , H04N19/176 , H04N19/103
摘要： The present disclosure relates to encoding visual data comprising a plurality of layers using one or more hierarchical algorithms. According to an aspect, there is provided a method of encoding visual data using a plurality of layers wherein each layer encodes a different representation, and wherein one or more of the plurality of layers comprises one or more hierarchical algorithms, the method comprising the steps of: extracting one or more samples within each of the plurality of layers; and processing within each layer the one or more samples extracted in the layer; wherein in at least one of the plurality of layers the step of processing comprises applying the one or more hierarchical algorithms to the samples extracted in the layer in relation to any inter-layer prediction; and wherein the step of processing reduces a predetermined mathematical distortion between samples of a first layer and samples of a second layer.
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公开(公告)号：US20200296385A1
公开(公告)日：2020-09-17
申请号：US16889962
申请日：2020-06-02
IPC分类号： H04N19/147 , H04N19/117 , H04N19/182 , H04N19/149 , H04N19/82 , H04N19/176
摘要： The disclosure provides a sample adaptive offset (SAO) encoder. The SAO encoder includes a statistics collection (SC) block and a rate distortion optimization (RDO) block coupled to the SC block. The SC block receives a set of deblocked pixels and a set of original pixels. The SC block categorizes each deblocked pixel of the set of deblocked pixels in at least one of a plurality of band and edge categories. The SC block estimates an error in each category as difference between a deblocked pixel of the set of deblocked pixels and corresponding original pixel of the set of original pixels. The RDO block determines a set of candidate offsets associated with each category and selects a candidate offset with a minimum RD cost. The minimum RD cost is used by a SAO type block and a decision block to generate final offsets for the SAO encoder.
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公开(公告)号：US20200275104A1
公开(公告)日：2020-08-27
申请号：US15931155
申请日：2020-05-13
发明人： Liang ZHAO , Wenyi SU , Lei ZHU
IPC分类号： H04N19/149 , H04N19/142
摘要： A method for controlling video coding includes obtaining a target rate for an image data unit to be encoded using one or more coding parameters. The one or more coding parameters are determined based on the target rate and a rate control model associated with one or more model parameters. The method further includes determining the one or more model parameters associated with the rate control model based on an encoding of one or more reference image data units using one or more reference coding parameters, determining the one or more coding parameters for encoding the image data unit based on the target rate and the rate control model associated with the one or more determined model parameters, and using the one or more determined coding parameters to encode the image data unit.
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公开(公告)号：US20200228817A1
公开(公告)日：2020-07-16
申请号：US16738728
申请日：2020-01-09
申请人： Tencent America LLC
发明人： Guichun LI , Xiang LI , Xiaozhong XU , Shan LIU
IPC分类号： H04N19/44 , H04N19/149 , H04N19/132 , H04N19/137 , H04N19/159 , H04N19/176
摘要： Aspects of the disclosure provide methods and apparatuses for video encoding/decoding. In some examples, an apparatus for video decoding includes receiving circuitry and processing circuitry. The processing circuitry decodes prediction information of a current block in a current picture from a coded video bitstream. The prediction information is indicative of an affine based motion vector prediction. The processing circuitry determines a first affine model for the current block. The first affine model has first affine parameters. Then, the processing circuitry determines a second affine model for a first clipping region in the current block. The second affine model has second affine parameters with differences to the first affine parameters being smaller than a threshold. Motion vectors determined based on the second affine model satisfy a clipping requirement. The processing circuitry reconstructs a sample in the first clipping region based on the second affine model.
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