Polynomial Brightness Gradation Correction for Image Quality
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Solution Overview
Problem
Existing image display systems inadequately control gradation attributes, as the brightness of high gradation affects low gradation attributes and vice versa, leading to insufficient image quality.
Innovation Solution
A gradation attributes correcting device that uses a brightness gradation correcting unit to determine correction information based on minimum, average, and maximum brightness, establishing a polynomial function for arithmetic operations to adjust gradation attributes, ensuring smooth curve representation and reducing non-continuous attribute issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gradation attributes are controlled separately for high brightness and low brightness using maximum and minimum brightness values, then control simplicity is maintained, but image quality deteriorates because the interplay between high and low brightness levels is not considered
Solution Approach 1:
The patent merges the control of high gradation and low gradation attributes into a unified control process. Instead of separately controlling high brightness (using maximum brightness) and low brightness (using minimum brightness) as in related art, this invention uses all brightness values including both maximum and minimum brightness to control both high and low gradation attributes simultaneously through a single polynomial function, thereby considering the interplay between different brightness levels while maintaining control efficiency
Solution Approach 2:
The patent changes the control parameter from separate maximum brightness and minimum brightness values to a comprehensive set of brightness values including both maximum and minimum brightness. By using all brightness values as input parameters for the polynomial function, the system achieves more accurate control of gradation attributes that reflects the actual interplay between high and low brightness levels in the image
2Measurement precision
If polynomial function is used for gradation correction, then control precision is improved, but computational complexity increases
Solution Approach 1:
The patent uses a polynomial function with a limited degree (degree 3 or lower) to balance precision and computational complexity. By constraining the polynomial degree, the invention achieves sufficient control precision for gradation correction while avoiding excessive computational burden that would result from higher-degree polynomials
Solution Approach 2:
The patent pre-calculates and stores correction values in a correction value table based on the polynomial function. During actual operation, the system copies or retrieves pre-computed correction values from the table rather than performing real-time polynomial calculations, significantly reducing computational complexity while maintaining the precision benefits of polynomial-based control
Data Source
AI summary
A gradation attributes correcting device to correct gradation attributes of an input image signal includes a brightness gradation correcting unit to correct gradation attributes with respect to brightness of an image indicated by the input image signal. The brightness gradation correcting unit includes a characteristic information acquisition unit, a correction information decision unit, and a brightness gradation processing unit. The characteristic information acquisition unit acquires a minimum, average, and maximum brightness, of an image on a frame from the input image signal. The correction information decision unit determines correction information to correct the gradation attributes with respect to brightness according to combinations of the acquired minimum, average and maximum brightness of the image on the frame. The brightness gradation correction processing unit establishes a polynomial function for the image on the frame based on the correction information to correct the gradation attributes by arithmetic operation using the polynomial function.