Display Image Processing Using BBHE and Gamma Adjustment
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Solution Overview
Problem
Existing image processing methods for display devices, such as plasma and liquid crystal displays, face challenges in maintaining image quality when adjusting backlight brightness to accommodate varying ambient light conditions, often resulting in decreased contrast, saturation, and increased power consumption.
Innovation Solution
The method employs Brightness Preserving Bi-Histogram Equalization (BBHE) to process images by calculating and adjusting average brightness, using a brightness adjustment parameter to compensate for decreased image quality, while simultaneously adjusting gamma values to enhance image quality under different ambient and backlight conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the backlight is adjusted to display a discernable image under various ambient light conditions, then the display visibility is improved, but the overall image quality deteriorates (low contrast, low chromatism, low saturation)
Solution Approach 1:
The patent applies parameter changes by adjusting multiple image processing parameters including gamma values, brightness adjustment parameters, and histogram equalization parameters. The system dynamically modifies these parameters based on ambient light conditions and backlight brightness levels to compensate for image quality degradation. Specifically, when backlight brightness is reduced, the system increases gamma values and applies brightness adjustment parameters to maintain image quality, thereby resolving the contradiction between visibility and image quality.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring ambient light conditions and backlight brightness levels, then using this information to dynamically adjust image processing parameters. The system calculates average brightness of the image and uses this feedback to determine appropriate gamma values and brightness adjustment parameters, creating a closed-loop control system that maintains optimal image quality across varying conditions.
2Reliability
If the number of bits is increased from eight bits to ten bits to compensate for low contrast and low chromatism, then the image quality and resolution are improved, but the cost increases
Solution Approach 1:
The patent replaces the mechanical approach of increasing bit depth (which requires hardware changes and costs more) with a software-based image processing approach. Instead of physically increasing the number of bits from eight to ten, the system uses algorithmic methods including gamma correction, histogram equalization, and brightness adjustment parameters to enhance image quality. This substitution achieves the same goal of improving image quality while avoiding the additional cost associated with higher bit depth hardware.
3Reliability
If the width and frequency of the pulse signal are increased to improve degraded image quality, then the image quality is improved, but the power consumption increases and overall uniformity of the panel degrades
Solution Approach 1:
The patent applies parameter changes by adjusting image processing parameters (gamma values, brightness adjustment parameters, histogram equalization parameters) rather than changing the physical pulse signal characteristics. This approach improves image quality through software-based processing while avoiding the power consumption increase and uniformity degradation that would result from increasing pulse width and frequency. The system maintains efficient power usage while achieving the desired image quality improvement through algorithmic processing.
Data Source
AI summary
The present invention provides an image processing method for a display device. The method includes: calculating an average brightness of an image; adjusting the average brightness to generate an adjusted average brightness; utilizing Brightness Preserving Bi-Histogram Equalization (BBHE) and the adjusted average brightness to process the image; and displaying the image.