Video Signal Processing Device for Dot Interference Removal
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Solution Overview
Problem
Existing video signal processing devices fail to accurately remove dot interference and cross color signals, which degrade video signal quality, especially in digital broadcasts, due to limited control over motion detection and phase alignment.
Innovation Solution
A video signal processing device that includes a buffer section for delaying input signals, motion detection sections for determining static and moving images at both screen and pixel units, and a circuit configuration that adjusts coefficients to remove dot interference and cross color signals by subtracting and multiplying differential signals based on precise motion detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cross color removing circuit operates only in unoperated or operated states based on static image determination, then the device complexity is reduced, but the manufacturing precision of dot interference and cross color removal deteriorates
Solution Approach 1:
The cross color removing circuit transitions from static operation states (operated/unoperated) to dynamic control based on motion detection. The circuit now adapts its operation level according to the detected motion amount, enabling fine-grained control that matches the actual image content requirements.
Solution Approach 2:
The invention introduces motion amount as a controllable parameter that dynamically adjusts the cross color removing circuit's operation. By changing the operation parameter from binary (on/off) to continuous (based on motion detection levels), the system achieves precise control over dot interference and cross color removal.
2Device complexity
If motion detection is performed only at screen unit level, then the device complexity is reduced, but the measurement precision of motion detection deteriorates
Solution Approach 1:
The motion detection function is segmented into two independent modules: screen unit motion detection and pixel unit motion detection. This segmentation allows each module to operate at its optimal resolution level, with the pixel unit detector providing high-precision local motion information and the screen unit detector providing overall motion context.
Solution Approach 2:
The invention adds a new dimension to motion detection by introducing pixel-level detection alongside screen-level detection. This multi-dimensional approach enables the system to capture motion information at different granularities, significantly improving measurement precision without proportionally increasing complexity.
Data Source
AI summary
A buffer delays an input luminance signal by a 1-frame period. A screen unit motion detection section determines whether an image indicated by the input luminance signal is a moving image or a static image by a screen unit, and outputs a gradual determination result from the static image to the moving image. A subtracter outputs a differential signal obtained by subtracting the input luminance signal from the luminance signal delayed by the 1-frame period. A pixel unit motion detector detects motion of a pixel unit and outputs a detection result by using a plurality of level values within a predetermined range. A limiter limits the differential signal in accordance with the determination result of the screen unit motion detector. An adder adds an output signal of the multiplier and the input luminance signal together.