Motion-Compensating Image Processing Circuit for Jitter Reduction
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Solution Overview
Problem
Conventional image processing methods for film mode to TV mode conversion result in jittering issues when motion objects are displayed, especially in high frame rate outputs like 100/120 frames per second, due to the repetition of frames not being generated at the same interval.
Innovation Solution
A motion-compensating image processing circuit and method that calculates motion vectors between successive fields and generates interpolation frames to smooth out the frame rate conversion, using a de-interlace circuit and motion interpolation circuit to create additional frames that are proportionally interpolated between original and restored frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame repetition is used for film mode to TV mode conversion, then frame rate output is improved, but jittering occurs due to non-uniform frame intervals
Solution Approach 1:
The patent applies preliminary action by pre-calculating motion vectors between successive fields and generating interpolation frames in advance before display. The motion compensation process prepares intermediate frames that smooth out the non-uniform timing, so when frames are output at high rates (100/120 fps), the temporal distribution is already optimized to prevent jittering.
Solution Approach 2:
The patent changes the temporal parameter of frame output by generating interpolation frames at calculated intermediate time points between original frames. Instead of simply repeating frames at fixed intervals, the system dynamically adjusts frame timing parameters based on motion vector analysis, creating a smoother temporal distribution that eliminates jitter while maintaining high frame rates.
2Device complexity
If simple frame copying is used for de-interlacing, then processing complexity is reduced, but visual quality deteriorates due to jittering artifacts
Solution Approach 1:
The patent introduces motion vectors as an intermediary element that mediates between the simple frame copying approach and high-quality interpolation. By calculating motion vectors between successive fields and using them to generate intermediate interpolation frames, the system achieves smooth visual transitions without requiring complex full-frame interpolation algorithms, thus balancing processing complexity and visual quality.
3Productivity
If high frame rate output (100/120 fps) is achieved through frame repetition, then productivity is improved, but jittering artifacts increase due to non-proportional frame distribution
Solution Approach 1:
The patent applies preliminary action by pre-calculating motion vectors between successive fields and generating interpolation frames in advance before display. The motion compensation process prepares intermediate frames that smooth out the non-uniform timing, so when frames are output at high rates (100/120 fps), the temporal distribution is already optimized to prevent jittering.
Solution Approach 2:
The patent changes the temporal parameter of frame output by generating interpolation frames at calculated intermediate time points between original frames. Instead of simply repeating frames at fixed intervals, the system dynamically adjusts frame timing parameters based on motion vector analysis, creating a smoother temporal distribution that eliminates jitter while maintaining high frame rates.
Data Source
AI summary
An image processing circuit includes a de-interlace circuit, a motion interpolation circuit and a frame processing circuit. The image processing circuit receives a first field and a second field respectively from two successive film frames. A plurality of block motion vectors are calculated according to the first field and the second field. A plurality of interpolated frames are calculated according to the first field, the second field and the plurality of motion vectors.