Bilateral High Frequency Boost for Video Coefficients
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Solution Overview
Problem
Bilateral filtering in video processing reduces high frequencies, leading to issues with frequency accuracy and compression efficiency, necessitating a method to boost high frequencies before filtering to maintain correct average values and improve compression efficiency.
Innovation Solution
Applying a set of offset values to coefficients based on threshold determinations, where values larger than a positive threshold are increased and those smaller than a negative threshold are decreased, with adjustments influenced by the number of nonzero coefficients and quantization factors, followed by filtering operations like bilateral filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bilateral filtering is applied to video data, then visual quality is improved and bit rate is reduced, but frequency accuracy deteriorates and compression efficiency decreases
Solution Approach 1:
The patent applies offset values to coefficients before bilateral filtering to pre-compensate for the frequency reduction effect. This preliminary action ensures that after filtering, the average frequency values remain correct, thus resolving the contradiction between improving visual quality through filtering and maintaining frequency accuracy.
Solution Approach 2:
The patent introduces offset values that counteract the harmful effect of bilateral filtering on frequency accuracy. By adding these offsets beforehand, the system prevents the deterioration of frequency accuracy that would otherwise occur when applying bilateral filtering to improve visual quality.
2Manufacturing precision
If bilateral filtering is applied to video data, then visual quality is improved, but compression efficiency deteriorates
Solution Approach 1:
The patent applies offset values to coefficients before bilateral filtering to pre-compensate for frequency reduction. This preliminary adjustment improves the effectiveness of filtering, allowing for better compression efficiency while maintaining visual quality, as the filtering operation becomes more precise and requires fewer bits to represent the same visual information.
3Measurement precision
If offset values are applied to coefficients, then frequency accuracy is improved, but device complexity increases
Solution Approach 1:
The patent modifies coefficient values by adding offset values based on quantization parameters and coefficient positions. This parameter change approach improves frequency accuracy through simple arithmetic operations rather than complex processing, thus resolving the contradiction between improving frequency accuracy and increasing device complexity.
Data Source
AI summary
Methods and apparatuses for video processing. In one aspect, filtering is applied after applying a set of offset values to one or more coefficients. The application of an offset value may be based on a determination as to whether the coefficient meets a threshold value.