Separable 2D Filter for Stereoscopic Video Processing
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Solution Overview
Problem
Conventional video encoding and decoding methods for stereoscopic signals face challenges in achieving efficient and fast processing, particularly for home video devices, as they struggle to maintain high picture quality and resolution while managing bandwidth and memory usage effectively.
Innovation Solution
The implementation of a separable two-dimensional filter in video encoders and decoders, which processes stereoscopic video signals by using one-dimensional horizontal and vertical filters to generate a reference processing unit layer, allowing for efficient computation and approximation of non-separable 2D filtering, thereby enhancing encoding and decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional video encoding methods are used for stereoscopic signals, then bandwidth and memory usage are reduced, but processing speed and picture quality deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the complex 2D filtering operation into separate 1D horizontal and vertical filtering operations. This is achieved by separating the filter coefficients into horizontal coefficients (for row operations) and vertical coefficients (for column operations), allowing the filtering to be performed in stages rather than as a single complex operation, thereby improving processing speed while maintaining quality
2Manufacturing precision
If non-separable 2D filtering is applied to stereoscopic video signals, then picture quality is improved, but computational complexity and processing time increase
Solution Approach 1:
The patent segments the 2D filtering operation into independent 1D horizontal and vertical filtering operations. Instead of applying a single complex 2D filter, the system applies horizontal filters to process rows of pixels, then applies vertical filters to process columns of the intermediate results. This segmentation reduces computational complexity by breaking down the filtering into simpler, more manageable operations that can be executed more efficiently
3Productivity
If separable 2D filtering is implemented, then encoding and decoding efficiency is improved, but filter coefficient selection becomes more complex
Solution Approach 1:
The patent applies parameter changes by adapting the filter coefficients based on the specific characteristics of the video signal and the desired output quality. The system selects appropriate horizontal and vertical filter coefficients from predefined sets, adjusting parameters such as filter strength and coefficient values to optimize the balance between encoding efficiency and picture quality for different stereoscopic video scenarios
Data Source
AI summary
A two-dimensional filter operates in accordance with a three-dimensional television signal having a basic layer, a reference processing unit layer and an enhancement layer. The two-dimensional filter generates a processed base layer reference picture from a base layer reference picture via a one-dimensional horizontal filter that horizontally filters the base layer reference picture to generate a first filtered base layer reference picture and a one-dimensional vertical filter, coupled to, but separable from, the one-dimensional horizontal filter, that vertically filters the first filtered base layer reference picture to generate a pre-processed base layer reference picture.