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CE6-related: Simplification of Shrink Transform (CE6.1.9)
Abstract
This contribution proposes simplification method of shrink transform included in core experiment CE6.1.9 as JVET-J1026. Regarding an up-sampling filter after inverse transform, while JVET-J0016 used 8-tap filter for luma and 4-tap filter for chroma, this contribution replaced it with 1-tap filter (i.e., pixel copy) for luma and chroma. This replacement reduce the burden of both hardware and software implementing. Simulation results show that almost same BD-rates and running times for both VTM and BMS between simplified shirnk transform and (complex) shrink transform.
JVET-K0399 CE6-related: Simplification of Shrink Transform (CE6.1.9) [K. Kawamura, Y. Kidani, Sei Naito (KDDI)] [late]
This is applied to transform length 64 (only). From the decoder perspective, the decoder does a length-32 inverse transform and then upscales the result to form the final residual. An encoder may be designed to perform a transform of input length 64 and keep the lower frequency coefficients or to downsample and perform a shorter transform.
In the CE the upscaling used an 8 tap filter. In this contribution it used value replication.
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The BMS uses a 64 point inverse transform with only the 32 lowest-frequency transform coefficients.
This processing treats this particular block length with a different processing in a way that did not seem clearly better and potentially inconsistent with the rest of the design.
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This processing treats this particular block length with a different processing in a way that did not seem clearly better and potentially inconsistent with the rest of the design.
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