18100277. METHOD AND APPARATUS FOR CODING IMAGE ON BASIS OF TRANSFORM simplified abstract (LG ELECTRONICS INC.)
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METHOD AND APPARATUS FOR CODING IMAGE ON BASIS OF TRANSFORM
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METHOD AND APPARATUS FOR CODING IMAGE ON BASIS OF TRANSFORM - A simplified explanation of the abstract
This abstract first appeared for US patent application 18100277 titled 'METHOD AND APPARATUS FOR CODING IMAGE ON BASIS OF TRANSFORM
Simplified Explanation
The image decoding method described in the patent application involves the following steps:
- Deriving a first variable indicating the presence of a valid coefficient in a region excluding the DC region from a current block.
- Deriving a second variable indicating the presence of a valid coefficient in a second region excluding the first region formed at the upper left end of the current block.
- Parsing an LFNST index from the bitstream when the first variable indicates the presence of a valid coefficient in the region excluding the DC region, and the second variable indicates the absence of a valid coefficient in the second region.
- Applying an LFNST matrix derived from the LFNST index to transform coefficients in the first region, resulting in modified transform coefficients.
Potential applications of this technology:
- Image and video decoding systems
- Multimedia compression and decompression algorithms
- Digital image processing
Problems solved by this technology:
- Efficiently decoding images and videos with complex coefficient transformations
- Improving the accuracy and quality of decoded images and videos
- Reducing the computational complexity of the decoding process
Benefits of this technology:
- Enhanced image and video decoding performance
- Improved compression efficiency
- Reduced computational requirements for decoding algorithms
Original Abstract Submitted
An image decoding method according to the present document may comprise the steps of: deriving a first variable indicating whether there is a valid coefficient in a region excluding a DC region from a current block; deriving a second variable indicating whether there is a valid coefficient in a second region excluding a first region formed at the upper left end of the current block; when the first variable indicates that the valid coefficient exists in the region excluding the DC region, and the second variable indicates that the valid coefficient does not exist in the second region, parsing an LFNST index from the bitstream; and applying an LFNST matrix derived on the basis of the LFNST index to transform coefficients in the first region, to derive the modified transform coefficients.
