Image Luminance Adjustment Circuit Using Statistical Signal Blending
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Solution Overview
Problem
Conventional luminance adjustment techniques for display devices are complex and result in slow processes and serious distortion, reducing picture quality due to boundary effects and requiring multiple steps at connecting points of linear oblique lines.
Innovation Solution
An apparatus comprising a complementary circuit, statistical circuit, calculating circuit, and blending circuit that generates a complementary luminance, statistical signal, and calculated luminance to produce an output image signal, reducing adjustment time and preventing distortion by blending input and calculated luminance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional linear oblique lines are used for luminance adjustment, then the adjustment process can be implemented, but the process becomes complex and slow with serious distortion
Solution Approach 1:
The patent divides the luminance adjustment process into three independent circuit modules: complementary circuit (generates 255-input luminance), statistical circuit (generates statistical signal from luminance histogram), and calculating circuit (computes calculated luminance using predetermined function). This segmentation allows parallel processing and eliminates the complexity of conventional step-by-step linear adjustment methods.
Solution Approach 2:
The patent changes the adjustment parameter from multiple linear oblique lines with many connecting points to a single calculated luminance value derived from statistical signals. The calculating circuit uses a predetermined function that takes input luminance, complementary luminance, and statistical signal as parameters, producing a single optimized luminance value that eliminates boundary effects and reduces processing complexity.
2Manufacturing precision
If multiple linear oblique lines with connecting points are used, then luminance adjustment can be achieved, but boundary effects occur and picture quality deteriorates
Solution Approach 1:
The patent extracts the essential luminance adjustment function from the complex multi-line system by using statistical signals (mean, standard deviation, skewness, kurtosis) to represent the overall luminance distribution characteristics. This extraction eliminates the need for multiple connecting points and their associated boundary effects, achieving smooth luminance transitions without picture quality deterioration.
3Ease of operation
If conventional adjustment technique is used, then luminance can be adjusted, but more process steps are needed at connecting points increasing adjustment time
Solution Approach 1:
The statistical circuit pre-calculates statistical signals (mean, standard deviation, skewness, kurtosis) from the luminance histogram before the actual luminance adjustment is performed. This preliminary action provides the calculating circuit with ready-to-use parameters, eliminating the need for time-consuming processing at connecting points during the adjustment phase and significantly reducing overall adjustment time.
Data Source
AI summary
The present invention relates to an apparatus and a method thereof for adjusting a luminance of an image signal. The apparatus includes a complementary circuit, a statistical circuit, a calculating circuit, and a blending circuit. The complementary circuit receives an image signal to generate a complementary luminance according to the luminance of the image signal. The statistical circuit receives the image signal to generate a statistical signal according to the luminance of the image signal. The calculating circuit receives the image signal, the complementary luminance, and the statistical signal to generate a calculated luminance of the image signal. The blending circuit generates an output image signal according to the calculated luminance and the luminance of the image signal. A video display device can thereby displays optimum pictures according to the output image signal.