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An encoder, a decoder, and corresponding methods that are used for transform process
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A technology of transform processing and transform block, which is applied in the field of transform processing and can solve the problem of video size becoming a problem.
Active Publication Date: 2021-11-30
HUAWEI TECH CO LTD
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The size of the video can also be an issue when storing the video in a storage device as memory resources can be limited
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example 1
[0341] Example 1. A decoding method implemented by a decoding device or an encoding device, comprising:
[0342] When the prediction mode of the current block is intra prediction, and the intra sub-partition (intra sub-partition, ISP) decoding mode is used to process the current block,
[0343] Determine whether the width of the current block is greater than or equal to a first threshold (in one example, the first threshold is 4, and the unit of the first threshold is luma samples), and determine whether the width of the current block is less than or equal to a second threshold a threshold (in one example, the second threshold is 16, and the unit of the second threshold is luminance samples);
[0344] When the width of the current block is greater than or equal to the first threshold and less than or equal to the second threshold, the transformation kernel DST 7 is used for horizontal transformation of the current block.
example 2
[0345] Example 2. The method of example 1, wherein when the width of the current block is smaller than the first threshold, or when the width of the current block is larger than the second threshold,
[0346] The transform kernel DCT 2 is used for horizontal transform of the current block.
example 3
[0347] Example 3. A decoding method implemented by a decoding device or an encoding device, comprising:
[0348] When the prediction mode of the current block is intra prediction, and the intra sub-partition (intra sub-partition, ISP) decoding mode is used to process the current block,
[0349] determining whether the height of the current block is greater than or equal to a third threshold (in one example, the third threshold is 4, and the unit of the third threshold is luminance samples), and determining whether the height of the current block is less than or equal to a fourth threshold Threshold (in one example, the fourth threshold is 16, and the unit of the fourth threshold is luminance samples);
[0350] When the height of the current block is greater than or equal to the third threshold and less than or equal to the fourth threshold, the transformation kernel DST 7 is used for vertical transformation of the current block.
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Abstract
The invention provides a method and an apparatus. A method of coding implemented by a decoding device, comprises: when a prediction mode of a current coding block is intra prediction, and the current coding block is processed by using Intra sub-partition coding mode, determining whether a width of a current transform block is larger than or equal to a first threshold or not, and whether the width of the current transform block is smaller than or equal to a second threshold or not, the current transform block is corresponded to the current coding block; when the width of the current transform block is larger than or equal to the first threshold and the width of the current transform block is smaller than or equal to the second threshold, performing transform process on the current transform block, wherein a transform core DST 7 is used on horizontal direction transform.
Description
technical field [0001] Embodiments of the present application (the present invention) generally relate to the field of image or video processing, and more specifically relate to a transformation process. Background technique [0002] Video decoding (video encoding and decoding) is widely used in digital video applications, such as broadcast digital TV, video transmission based on the Internet and mobile networks, real-time session applications such as video chatting, video conferencing, DVD and Blu-ray discs, video content acquisition and editing systems and security applications for camcorders. [0003] Large amounts of video data need to be described even in the case of short videos, which can cause difficulties when the data is to be streamed or otherwise communicated in communication networks with limited bandwidth capacity. Therefore, video data is usually compressed before being transmitted over modern telecommunications networks. Since memory resources may be limite...
Claims
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