Image Encoding Skip Mode Flag Reuse for Compression
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Solution Overview
Problem
Conventional image compression methods, such as those described in JP Patent Publication (Kokai) No. 2008-154015 A, require additional determination information, leading to a lower compression rate due to the need for flag information to switch between predicted images, which increases encoding quantity.
Innovation Solution
The method selects either an in-screen or between-screen predicted image, or an interpolation predicted image based on skip mode information, eliminating the need for new determination information by using existing encoding flags, specifically in the H.264/AVC standard, to improve compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional determination information (flag information) is added to switch between predicted images, then the ability to select optimal predicted images is improved, but the encoding quantity increases and compression rate decreases
Solution Approach 1:
The patent makes existing skip mode flag information serve multiple functions: it not only indicates skip mode selection as originally defined in H.264/AVC but also determines the selection between in-screen/between-screen predicted images and interpolation predicted images. This multi-functionality eliminates the need for separate determination flags, thereby improving compression rate while maintaining predicted image selection capability.
Solution Approach 2:
The patent changes the functional interpretation of existing skip mode flag parameters to include predicted image type selection. By reusing existing encoding flags with expanded functionality rather than introducing new parameters, the system avoids increasing encoding quantity while still achieving adaptive predicted image selection.
2Productivity
If move searching process is executed between decoded images to generate interpolation predicted images, then compression rate may be improved, but encoding complexity and determination information requirements increase
Solution Approach 1:
The patent dynamically selects between different predicted image generation methods (in-screen prediction, between-screen prediction, and interpolation prediction) based on the skip mode flag value. This dynamic selection allows the system to adapt to different video content characteristics, achieving improved compression rates while managing encoding complexity through conditional execution rather than always executing all prediction methods.
Data Source
AI summary
A technique for improving a compression rate without needing new determination information (encoding flag information) is provided. For compression of each area to be encoded, based on a skip mode (a process which does not compress information of the area to be encoded, but copies previous information of the area to be encoded), it is determined whether an existing predicted image generated by an existing encoding standard is used, or an interpolation predicted image newly generated by executing move searching between decoded images is used.