Artifact Reduction Filter for Video Compression Quality
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Solution Overview
Problem
Existing video encoding and decoding methods compress videos without considering display characteristics, leading to varying subjective image quality across different displays and increased bit allocation to noise, resulting in a decreased compression rate.
Innovation Solution
An image encoding method and apparatus that uses an artifact reduction filter to generate and decode images by applying a first and second artifact reduction filter, determining bit-rate distortion costs, and including information in the bitstream about the filter application, allowing for optimized bitstream generation and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video is compressed without considering display characteristics, then compression rate is maintained, but subjective image quality varies across different displays
Solution Approach 1:
The patent applies different artifact reduction filters based on display characteristics by changing the filtering parameters. The encoder selects between first and second artifact reduction filters, and the decoder applies corresponding filters based on received information, thereby adapting the compression and reconstruction process to specific display properties while maintaining consistent image quality across different displays
Solution Approach 2:
The patent performs preliminary determination of display characteristics and selects appropriate artifact reduction filters before actual video decoding. The encoder determines which filter to use and transmits this information in the bitstream, allowing the decoder to prepare and apply the correct filter in advance, ensuring consistent image quality before the video is displayed
2Manufacturing precision
If a large number of bits are allocated to noise for post-processing, then image quality is improved, but compression rate decreases
Solution Approach 1:
The patent performs preliminary determination of display characteristics and selects appropriate artifact reduction filters before actual video decoding. The encoder determines which filter to use and transmits this information in the bitstream, allowing the decoder to prepare and apply the correct filter in advance, ensuring consistent image quality before the video is displayed
Solution Approach 2:
The patent applies different artifact reduction filters based on display characteristics by changing the filtering parameters. The encoder selects between first and second artifact reduction filters, and the decoder applies corresponding filters based on received information, thereby adapting the compression and reconstruction process to specific display properties while maintaining consistent image quality across different displays
Data Source
AI summary
Provided is an image encoding method including generating a first picture reconstructed by using a residual picture and a predicted picture; generating a second picture by applying a first artifact reduction filter to the first picture; determining a picture having a smaller bit-rate distortion cost from among the first and second pictures by comparing a first bit-rate distortion cost of the first picture with a second bit-rate distortion cost of the second picture; generating a third picture by applying an in-loop filter to the determined picture; generating a fourth picture by applying a second artifact reduction filter to the third picture; determining a picture having smaller distortion from among the third and fourth pictures by comparing first distortion of the third picture with second distortion of the fourth picture; and generating, via a processor, a bitstream including information about whether the second artifact reduction filter is applied.