Video Signal Correction for Mobile Power Efficiency
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Solution Overview
Problem
Mobile terminal devices face power consumption issues when correcting luminance and color difference signals for each frame, leading to reduced usability, especially when used outdoors due to environmental light interference.
Innovation Solution
An image processing apparatus with an input portion, illumination sensor, and control portion that adjusts video signals based on detected illumination and signal characteristics, optimizing power usage and image display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If luminance and color difference signals are corrected for each frame, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent applies partial correction by selectively correcting only specific signal components (luminance and color difference signals) rather than processing the entire video signal, and performs correction only when necessary based on frame changes, thereby reducing overall processing load and power consumption while maintaining acceptable image quality
Solution Approach 2:
The video signal is segmented into luminance and color difference components, allowing independent processing of each component. This segmentation enables targeted correction strategies that reduce computational complexity and power consumption compared to processing the full RGB signal
2Adaptability or versatility
If video signals are corrected dynamically, then image adaptability to environment is improved, but processing complexity increases
Solution Approach 1:
The system uses feedback from frame change detection to control when correction processing is performed. By monitoring changes between frames and triggering correction only when necessary, the system adapts to environmental conditions dynamically while avoiding unnecessary processing operations that would increase complexity
3Manufacturing precision
If correction processing is performed frequently, then image quality is maintained, but usable time of mobile device decreases
Solution Approach 1:
The correction processing is performed periodically based on frame changes rather than continuously. The system checks for frame changes at regular intervals and performs correction only when changes are detected, maintaining image quality while significantly reducing the total processing time and extending battery life
Data Source
AI summary
An image processing apparatus has an input portion for receiving video signals, an illumination sensor for detecting illumination of an environmental light, a corrector for correcting the video signals, and a controller for controlling the corrector to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals and with the detected illumination when any change occurs in the video signal. The apparatus further has a detector for detecting a change of the video signals in accordance with a mean value of luminance of the inputted video signals, a corrector for correcting the video signals, and a controller for controlling the correction portion to correct the video signals in accordance with distribution of luminance or hue or saturation of the video signals when the detector detects the change of the video signals.