Adaptive Interpolation Filter Coefficients for Image Encoding
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Solution Overview
Problem
Existing image encoding technologies, such as H.264/AVC, face inefficiencies in encoding due to the use of fixed interpolation filter coefficients, which are not optimal for all inter block modes, leading to degradation in encoding efficiency and increased bit rate.
Innovation Solution
An adaptive interpolation filter coefficient calculation method is implemented, where an image encoding apparatus calculates adaptive coefficients for each frame, encodes the frame using interpolated reference frames, and determines whether to include the coefficients in the bit stream based on differences with previous frames, thereby reducing the bit rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptive interpolation filter coefficients are calculated and transmitted for each frame, then encoding efficiency is improved, but bit rate increases
Solution Approach 1:
The patent changes the parameter of filter coefficients from fixed to adaptive, allowing the encoding apparatus to calculate optimal coefficients for each frame based on image characteristics. This improves encoding efficiency by matching the filter characteristics to the actual image content, achieving better compression performance.
Solution Approach 2:
Instead of transmitting all filter coefficients for every frame, the patent transmits only when necessary - when the calculated adaptive coefficients differ from default or previous frame coefficients. This selective transmission approach maintains encoding efficiency improvements while minimizing bit rate increase.
2Device complexity
If fixed filter coefficients are used for all inter block modes, then device complexity is reduced, but encoding efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic filter coefficients that adapt to different inter block modes and image characteristics. Instead of using static fixed coefficients for all modes, the system calculates and applies different coefficients based on the specific block mode and image content, improving encoding efficiency without significantly increasing device complexity through systematic coefficient calculation methods.
Solution Approach 2:
The patent applies different filter coefficients to different block modes and regions based on their specific characteristics. Each inter block mode (e.g., horizontal, vertical, diagonal) receives optimized coefficients tailored to its directional characteristics, improving encoding efficiency by matching filter properties to local image features and block modes.
Data Source
AI summary
An image encoding/decoding method and apparatus using coefficients of an adaptive interpolation filter are disclosed including: a coefficient calculator for calculating adaptive interpolation filter coefficient of a current frame; an image encoder for interpolating reference frames using the adaptive interpolation filter coefficient of the current frame and encoding the current frame using the interpolated reference frames; a filter flag encoder for generating and encoding a coefficient-inserted flag or coefficient non-inserted flag as a filter flag according to the adaptive interpolation filter coefficient of the current frame; a coefficient encoder for encoding the adaptive interpolation filter coefficient of the current frame when the filter flag is a coefficient-inserted flag; and a bit stream generator for generating and outputting a bit stream, which includes the encoded current frame and encoded filter flag, and further includes encoded adaptive interpolation filter coefficient of the current frame when the filter flag is the coefficient-inserted flag.