De-interlacing Threshold Adaptation via Motion Offset Processing
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Solution Overview
Problem
Existing image signal processing methods often misidentify signal modes due to fixed thresholds, leading to improper de-interlacing and significant degradation in image display quality when converting between video-mode and film-mode signals.
Innovation Solution
The method employs an offset processing mechanism to dynamically adjust thresholds based on motion values, using formulas to generate dynamic thresholds that adapt over time, reducing errors in signal mode identification and ensuring accurate de-interlacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold is used to generate field variation judge values, then the device complexity is reduced, but the measurement precision of signal mode identification deteriorates
Solution Approach 1:
The patent transforms the static fixed threshold into a dynamic threshold that adapts to motion conditions. The threshold is generated based on motion values calculated from pixel differences between fields, allowing the system to automatically adjust sensitivity according to actual motion levels in the video signal, thereby improving identification accuracy without significantly increasing complexity
Solution Approach 2:
The patent changes the threshold parameter from a fixed constant to a dynamically calculated value based on motion analysis. By computing motion values from pixel differences and using these to generate adaptive thresholds, the system responds to varying motion conditions in different video sequences, resolving the contradiction between simplicity and precision
2Ease of operation
If a fixed threshold is used for generating field variation judge values, then the ease of operation is improved, but the reliability of de-interlacing deteriorates
Solution Approach 1:
The patent implements a self-adjusting threshold mechanism that automatically adapts to different video content without requiring manual configuration. The system calculates motion values from the input signal itself and uses these to generate appropriate thresholds, making the de-interlacing process reliable across various motion conditions while maintaining ease of operation
Solution Approach 2:
The patent introduces feedback through motion analysis, where the system continuously monitors pixel differences between fields, calculates motion values, and uses this information to adjust thresholds dynamically. This feedback loop ensures reliable de-interlacing by adapting to actual motion conditions in the video signal
3Productivity
If motion values are compared with a fixed threshold, then the processing speed is maintained, but the manufacturing precision of JV series generation deteriorates
Solution Approach 1:
The patent replaces static threshold comparison with dynamic threshold generation based on motion values. The threshold adapts to the actual motion content in each video sequence, improving JV series generation accuracy while maintaining processing efficiency through algorithmic optimization
Data Source
AI summary
An image signal processing method is disclosed for maintaining high image display quality by avoiding signal-mode misjudgment. The image signal processing method includes generating a first threshold based on a plurality of motion values generated prior to a first time when an image input signal is detected to be of a film mode, generating a second threshold based on the first threshold and a first offset, generating a third threshold based on the first threshold and a second offset, and determining whether the image input signal between the first time and a second time is the film mode or a video mode based on the second and third thresholds.