Video image coding method based on secondary conversion and device of the same

JP2025090835A5Active Publication Date: 2025-09-05LG ELECTRONICS INC
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Patent Information

Application Number
JP2025044400
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2018-12-06
Filing Date
2025-03-19
Publication Date
2025-09-05
Estimated Expiration
2039-12-05

AI Technical Summary

Technical Problem

The increasing demand for high-resolution and high-quality video data, such as 4K or UHD, poses challenges in efficient compression, transmission, storage, and reproduction, leading to higher costs and reduced efficiency in existing video coding technologies.

Method used

A video coding method and apparatus that utilizes a reduced secondary transform (RST) and a conversion set to enhance coding efficiency, involving the derivation of quantized conversion coefficients, inverse quantization, inverse RST, and inverse primary conversion to generate restored pictures.

Benefits of technology

The proposed method improves the efficiency of video coding, enhances the conversion efficiency, and optimizes the secondary conversion process, leading to better compression and transmission of high-resolution video data.

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Abstract

To provide a video image coding method for enhancing an efficiency of a video image coding and a device.SOLUTION: A video image coding method contains: a step of introducing a conversion coefficient via an inverse quantization on the basis of the conversion coefficient to be quantized to an object block; a step of introducing the conversion coefficient to be corrected on the basis of an inverse RST to the conversion coefficient; and a step of generating a decoding picture on the basis of a residual sample to the object block on the basis of an inverse primary conversion to the conversion coefficient to be corrected. The inverse RST is performed on the basis of a conversion kernel matrix selected from a conversion set to be determined on the basis of a mapping relation by an intra-prediction mode adopted to the object block and two conversion kernel matrixes contained to the conversion set, and is performed on the basis of whether or not the inverse RST is adopted or a conversion index for instructing any one of the conversion kernel matrixes contained to the conversion set.SELECTED DRAWING: Figure 10
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