Video Decoding Transform Method Based on Block Information
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Solution Overview
Problem
High-resolution and high-quality video data requires efficient compression techniques to reduce transmission and storage costs, but existing methods do not adequately utilize prediction block information for optimal transform methods.
Innovation Solution
A video decoding method and apparatus that determine the appropriate inverse transform method based on prediction block information, using Discrete Sine Transform (DST) or Discrete Cosine Transform (DCT) depending on the intra prediction mode and block characteristics, such as size and luma sample status, to improve coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If video data is transmitted using existing wired/wireless broadband lines or stored using existing storage media, then transmission and storage costs are increased, but video quality and resolution are maintained
Solution Approach 1:
The patent applies transform methods (DCT, DST, ADST) to convert spatial domain video data into frequency domain coefficients, changing the representation parameters to achieve better compression characteristics. By selecting different transform types based on prediction block characteristics, the patent optimizes the transformation parameters to reduce data amount while maintaining quality
Solution Approach 2:
The patent applies different inverse transform methods (inverse DCT, inverse DST, inverse ADST) to different prediction blocks based on their local characteristics such as intra prediction mode and block size. This local adaptation of transform methods optimizes compression efficiency for each specific block type, reducing overall data amount while preserving local video quality
2Productivity
If high-resolution and high-quality video data is processed, then coding efficiency is improved, but transform method selection complexity increases
Solution Approach 1:
The patent changes the transform method parameters (type of inverse transform) based on prediction block parameters such as intra prediction mode and block size. This parameter adaptation allows the system to achieve high coding efficiency by selecting optimal transforms for different block characteristics without requiring complex manual configuration
Solution Approach 2:
The patent implements dynamic selection of inverse transform methods based on real-time analysis of prediction block characteristics. The transform method is dynamically adjusted according to the intra prediction mode and block size, allowing the system to adapt to different video content characteristics and maintain high coding efficiency across varying scenarios
Data Source
AI summary
Disclosed are a transform method based on block information and an apparatus using the method. An image-decoding method comprises: a step of taking information on a block as an input; and a transform method determination step of determining an inverse transform method for the block on the basis of whether or not the prediction mode of the block is an intra-prediction mode, whether or not the size of the block satisfies a predetermined condition, and whether or not the block is a block for a luminance sample. Accordingly, encoding efficiency can be improved by using an appropriate transform method on the basis of the information on a prediction block and an intra-prediction mode.