Display Image Processing for Low-Power Brightness and Sharpness Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital devices face challenges in reducing power consumption without degrading image quality, as existing methods like linearly decreasing pixel values or histogram equalization lead to decreased contrast, sharpness, and overall brightness, especially when using local dimming schemes.
Innovation Solution
A method involving preprocessing to enhance image contrast and sharpness by separating image signals into frequency bands, adjusting gains, and synthesizing them, followed by post-processing that divides the screen into areas and adjusts pixel values based on reference values to minimize image quality degradation while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the maximum brightness of the image is decreased to reduce power consumption, then power consumption is reduced, but image quality (contrast and sharpness) is degraded
Solution Approach 1:
The patent applies preliminary action by performing contrast enhancement and sharpness improvement processing on the image signal before displaying it at reduced brightness. This preprocessing ensures that when the display brightness is lowered to save power, the image quality parameters (contrast and sharpness) are maintained through prior computational adjustments to the image data.
Solution Approach 2:
The patent changes image signal parameters (contrast, sharpness, brightness distribution) through processing algorithms before display. By adjusting these parameters computationally, the system maintains perceived image quality even when the physical display brightness is reduced, thereby resolving the contradiction between power consumption and image quality.
2Use of energy by stationary object
If linear pixel value decrease is used to restrict power consumption, then power consumption is reduced, but dynamic range and overall brightness are decreased leading to image quality degradation
Solution Approach 1:
The patent applies local quality by differentiating between various regions of the image and applying different processing strategies. Rather than uniformly decreasing all pixel values, the system identifies and preserves important image regions while adjusting less critical areas, thereby maintaining overall brightness perception and dynamic range while still achieving power consumption reduction.
3Use of energy by stationary object
If histogram equalization is used to restrict power consumption, then power consumption is reduced, but brightness changes at area boundaries cause artifacts and loss of detail in bright parts
Solution Approach 1:
The patent modifies the histogram equalization process by adjusting parameters such as the equalization range and threshold values. This modified approach redistributes pixel values more smoothly across the image, preventing abrupt brightness changes at area boundaries that cause artifacts, while still achieving the goal of reducing overall power consumption.
Data Source
AI summary
A digital device and a control method thereof are disclosed in the present specification. The digital device and the control method thereof according to the present invention may comprise the steps of receiving an image signal; separating the received image signal by a plurality of frequency bands; adjusting a gain for the image signal of each of the separated frequency bands; displaying an enhanced image on a screen by synthesizing the image signals of the respective frequency bands in which the gain has been adjusted; separating the screen, on which the enhanced image is displayed, into a plurality of areas; checking whether the maximum pixel value of the enhanced image displayed on the separated screen area, if the maximum pixel value of the enhanced image is larger than the reference value.