Dynamic Video Edge Enhancement for Low-Light Display Visibility
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Solution Overview
Problem
Existing automatic luminance control methods in automotive display applications struggle to maintain visibility of lower gray shades, especially in low ambient light conditions, and fixed edge enhancements can be ineffective in varying lighting environments.
Innovation Solution
A dynamic edge enhancement system that includes a light sensor, a circuit, and a microcontroller, which generates a histogram of gray shade values, detects edges, and enhances them based on a gray shade transfer table and an edge mask strength value, adjusting edge visibility according to ambient light levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If automatic luminance control increases display luminance to maintain visibility in bright environments, then symbol visibility is improved, but power consumption increases
Solution Approach 1:
The system employs feedback through a light sensor that continuously measures ambient light levels and provides this information to the microcontroller. Based on this feedback, the microcontroller dynamically adjusts both the display luminance and edge enhancement parameters, increasing luminance only when ambient light levels warrant it, thereby maintaining symbol visibility while minimizing unnecessary power consumption in low light conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains visibility of symbols in automotive displays by dynamically adjusting edge enhancements based on ambient light conditions, improving visibility of lower gray shades and reducing power consumption.
Implementation Method 1
The light sensor is operational to generate a light background signal by measuring an ambient light falling on a display
Data Source
AI summary
A dynamic edge enhancement system includes a light sensor, a circuit, and a microcontroller. The light sensor is operational to generate a light background signal by measuring an ambient light falling on a display. The circuit is operational to generate a histogram of gray shade values in multiple frames of an input video signal received by the circuit, detect multiple edges in the input video signal, enhance the multiple edges in response to a gray shade transfer table and an edge mask strength value, and generate an output video signal suitable to drive the display after the enhancement of the edges. The microcontroller is operational to generate the gray shade transfer table based on the histogram generated by the circuit, and generate the edge mask strength value in response to the gray shade transfer table, the light background signal, a night luminance threshold value, and a day luminance threshold value.