Luminance Correction Circuit Weighted Frame Averaging
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Solution Overview
Problem
Existing video signal processing techniques fail to effectively suppress luminance changes in video signals with temporal changes, leading to issues like flicker and unnatural motion blur.
Innovation Solution
A video signal processing apparatus that uses a luminance correction circuit to multiply and average video signals of sequential frames with individually set weight coefficients, where the weight coefficient for the reference frame is maximum, and coefficients for other frames decrease with distance, allowing for customizable weight coefficient sets and motion-based adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If video signals of multiple sequential frames are added and averaged with equal weights to suppress luminance changes, then flicker correction is achieved, but motion blur becomes unnatural and uniform across all frames
Solution Approach 1:
The patent applies different weight coefficients to different frames in the averaging process. Specifically, frames closer to the reference frame are given higher weights while frames farther away receive lower weights. This creates a non-uniform weighting scheme that preserves natural motion blur characteristics in regions closer to the reference frame while still suppressing flicker through the averaging of multiple frames with varying weights.
2Device complexity
If a fixed number of frames M is used for averaging, then processing simplicity is maintained, but adaptability to different motion speeds and lighting conditions is reduced
Solution Approach 1:
The patent introduces dynamic weight coefficient adjustment based on motion detection. The system detects motion between frames and automatically adjusts the weight coefficients accordingly. When motion is detected, frames with larger temporal distances from the reference frame are assigned smaller weights, while in static scenes, equal weighting can be used. This dynamic adaptation allows the same processing framework to handle both static and moving subjects effectively without increasing fundamental processing complexity.
3Productivity
If equal weight coefficients are applied to all frames, then the processing is simple and fast, but the correction intensity is uniform and cannot be tailored to different frames
Solution Approach 1:
The patent changes the parameter of weight coefficients from uniform to variable based on frame position. The weight coefficient for each frame is determined by its temporal distance from the reference frame, creating a gradient where closer frames have higher weights and farther frames have lower weights. This parameter variation enables tailored correction intensity for different frames while maintaining computational efficiency through a systematic weighting scheme rather than frame-by-frame analysis.
Data Source
AI summary
This video signal processing apparatus includes a luminance correction circuit that multiplies video signals of M sequential frames by weight coefficients individually set for frames respectively ordered in the M frames, M being plural, and adds and averages results, to generate a correction video signal of a frame in a predetermined order in the M frames, a value of a weight coefficient set for the frame in the predetermined order being set to be maximum among values of the weight coefficients individually set for the frames respectively ordered in the M frames.