Adaptive Color Transform Clipping for Bit-Depth Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images and videos, along with the rise of immersive media formats like virtual reality and augmented reality, necessitates a high-efficiency image and video compression technology to minimize transmission and storage costs while maintaining subjective and objective visual quality.
Innovation Solution
The application of adaptive color transform (ACT) in video/image coding, with a clipping range determined based on bit depth, is used to enhance compression efficiency by effectively handling residual samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality image/video data is transmitted or stored using existing media, then image quality is improved, but transmission costs and storage costs are increased
Solution Approach 1:
The patent extracts only the essential visual information by separating image data into luma and chroma components, then applies different compression strategies to each. The chroma component is downsampled and compressed more aggressively since human vision is less sensitive to color details, thereby reducing transmission and storage costs while maintaining perceived image quality.
Solution Approach 2:
The patent changes the color space representation parameters by converting from RGB to YCbCr color space, enabling independent processing of luma (brightness) and chroma (color) components. This parameter transformation allows for differential compression where chroma can be reduced in resolution and precision without significantly impacting visual quality, thus reducing overall data transmission and storage requirements.
2Productivity
If adaptive color transform is applied to residual samples, then compression efficiency is improved, but residual signal loss may occur without proper clipping
Solution Approach 1:
The patent applies clipping to residual samples before the adaptive color transform is executed. By pre-clipping the residual values to a valid range, the patent prevents overflow or underflow that would cause information loss during the color space conversion, thereby maintaining both compression efficiency and signal integrity.
Solution Approach 2:
The clipping operation acts as a protective measure that cushions the residual samples against extreme values that could cause distortion during ACT. By bounding the residual values within a safe range beforehand, the patent prevents harmful effects from propagating through the compression pipeline, ensuring both efficiency and fidelity.
Data Source
AI summary
According to the disclosure of this document, it is possible to derive a residual sample by applying an adaptive color transform (ACT) to a current block on the basis of ACT-related information, and at this time, the residual sample is clipped and derived on the basis of a clipping range, wherein the clipping range is determined on the basis of a bit depth.