Non-separable secondary transform for video coding
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A technology of inverse transform and video block, applied in the field of video decoding
Active Publication Date: 2018-06-08
QUALCOMM INC
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[0006] Spatial or temporal prediction leads...
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[0042] In general, this disclosure describes techniques in video coding related to the design of secondary transforms applied to intra- or inter-prediction residual data. Transforms may be used in the context of advanced video codecs, such as extensions to HEVC or next-generation video coding standards.
[0043] The video encoder may be adapted to represent the residual block of video data in a form output from the video encoder to the video decoder. There is a need to reduce the amount of data used to represent the residual block so that the amount of data transmitted from the video encoder to the video decoder is reduced. In video coding, separable transforms are applied more than non-separable transforms because separable transforms may use fewer operations (eg, addition, multiplication) than non-separable transforms. A separable transform can be written as a filter that is the product of two or more filters. In contrast, non-separable filters cannot be written as the pro...
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Abstract
Techniques are described in which a decoder is configured to inversely quantize a first coefficient block and apply a first inverse transform to at least part of the inversely quantized first coefficient block to generate a second coefficient block. The first inverse transform is a non-separable transform. The decoder is further configured to apply a second inverse transform to the second coefficient block to generate a residual video block. The second inverse transform converts the second coefficient block from a frequency domain to a pixel domain. The decoder is further configured to form adecoded video block, wherein forming the decoded video block comprises summing the residual video block with one or more predictive blocks.
Description
[0001] Related applications [0002] This application asserts U.S. Provisional Application Nos. 62 / 234,644 filed September 29, 2015, U.S. Provisional Application Nos. 62 / 294,897 filed February 12, 2016, and 62 filed April 15, 2016 / 323,496, and U.S. Provisional Application No. 62 / 337,736, filed May 17, 2016, the entire contents of each of which are incorporated herein by reference. technical field [0003] The present invention relates to video coding. Background technique [0004] Digital video capabilities can be incorporated into a wide range of devices, including digital television, digital live broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, tablet computers, e-book readers, digital video cameras, Digital recording devices, digital media players, video game devices, video game consoles, cellular or satellite radiotelephones (so-called "smart phones"), video teleconferencing devices, video streaming device...
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