Adaptive Video Frame Decimation for Motion-Aware Compression
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Solution Overview
Problem
Conventional decimation processing in video recording and transmission systems can cause image quality deterioration, such as motion judder, especially when handling highly dynamic video signals, due to a fixed decimation rate that disrupts continuous motion.
Innovation Solution
A recording and reproducing apparatus that decimates video frames at varying rates based on the motion characteristics of the input video signal, using a frame decimation unit and encoding unit to reduce the encoding amount while storing frame decimation information for later interpolation and display, allowing for adaptive frame rate conversion to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If decimation processing is performed at a predetermined decimation rate, then the encoding amount is reduced and longer video can be recorded, but image quality deteriorates due to motion judder in highly dynamic video signals
Solution Approach 1:
The patent applies dynamics by making the decimation rate variable rather than fixed. The decimation rate is dynamically adjusted based on the motion characteristics of the video content - higher decimation rates are used for static or low-motion scenes, while lower decimation rates are used for high-motion scenes. This dynamic adaptation resolves the contradiction by allowing aggressive compression when quality requirements are lower while maintaining quality when motion demands it.
Solution Approach 2:
The patent changes the parameter of decimation rate from a predetermined fixed value to a variable parameter that adapts to content characteristics. By monitoring motion vectors or frame differences and adjusting the decimation rate accordingly, the system optimizes the balance between compression efficiency and image quality, reducing encoding amount without causing motion judder in dynamic scenes.
2Productivity
If a fixed decimation rate is used, then the encoding process is simple and fast, but continuous motion in video is disrupted causing motion judder
Solution Approach 1:
The patent implements feedback by analyzing motion characteristics of the video content and using this information to adjust the decimation rate. Motion vectors or frame difference metrics provide feedback about the dynamic nature of the scene, which then feeds back into the decimation decision process. This closed-loop approach maintains motion continuity by preventing excessive frame skipping in high-motion scenes while still achieving compression in appropriate scenes.
Solution Approach 2:
The system transitions from static decimation to dynamic decimation where the decimation rate adapts in real-time based on content analysis. This dynamic approach preserves the perceptual continuity of motion by adjusting frame sampling density according to actual motion demands, resolving the contradiction between encoding efficiency and motion fidelity.
Data Source
AI summary
A video signal recording and reproducing apparatus is provided that is capable of reducing the encoding amount required for video recording thereby to record a longer video signal while suppressing deterioration of image quality when the video is displayed. An apparatus is also provided that is similarly capable of efficiently transmitting the video signal with a smaller transmission capacity during transmission of the video signal. A structure constituting the present invention comprises: a decoding unit which decodes an inputted video signal into video frames; a decimation unit which decimates the number of video frames decoded by the decimation unit; an encoding unit which encodes the video frames decimated by the decimation unit into encoded video signals; and a storage device which stores the video signals encoded by the encoding unit, wherein the decimation unit performs decimation for each video signal.