Image Sensor Anti-Shading Brightness Adjustment
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Solution Overview
Problem
Existing methods for adjusting image brightness, such as those using polynomials or analog/digital circuits, result in complex calculations and high hardware costs due to the need for multiple multipliers, leading to inefficient processing times and costs.
Innovation Solution
An adjusting apparatus comprising a detecting module, a calculating module, and a gain module that calculates the distance of each pixel from a center pixel, allowing for brightness adjustment using simple shift and adder operations, reducing calculation time and hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polynomials are used to calculate brightness compensation, then brightness adjustment can be achieved, but the calculation becomes complex and processing time increases
Solution Approach 1:
The patent changes the mathematical parameters from complex polynomial calculations to simpler distance-based calculations. Instead of using polynomial coefficients and higher-order terms, the invention uses the distance from the center pixel as the key parameter, which can be calculated using basic arithmetic operations (subtraction and square root), thereby reducing processing time while maintaining brightness compensation accuracy.
2Measurement precision
If analog circuits with multiple multipliers are used for brightness compensation, then brightness adjustment can be performed, but hardware cost and circuit complexity increase
Solution Approach 1:
The patent extracts the essential function of brightness compensation from complex analog circuits with multiple multipliers. By identifying that the core requirement is to adjust brightness based on distance from the center, the invention simplifies the circuit to use only basic arithmetic operations (subtraction and square root calculations), eliminating the need for complex multiplier circuits while maintaining the compensation function.
Solution Approach 2:
The patent replaces complex analog circuit mechanisms with simpler digital signal processing operations. Instead of using analog multipliers and complex circuitry, the invention uses digital calculations based on distance from the center pixel, which can be implemented with simpler hardware resources such as adders and lookup tables, thereby reducing device complexity.
3Measurement precision
If digital circuits with multiple multipliers are used for brightness compensation, then brightness adjustment can be achieved, but hardware cost and calculation speed decrease
Solution Approach 1:
The patent changes the computational parameters from complex polynomial evaluations requiring multiple multipliers to simpler distance-based calculations. By using the distance from the center pixel as the primary parameter and employing basic arithmetic operations (subtraction and square root), the invention significantly reduces the number of multiplication operations needed, thereby improving calculation speed while maintaining compensation accuracy.
Data Source
AI summary
This invention discloses an adjusting apparatus for adjusting the brightness of an image including a plurality of pixels having a center pixel and an initial pixel. The adjusting apparatus includes a detecting module, a calculating module and a gain module. The detecting module receives the image and detects the brightness of each pixel of the image. The calculating module calculates the distance between each pixel and the center pixel according the distance between initial pixel and the center pixel. The gain module respectively adjusts the brightness of each pixel among the plural pixels according to the distance between each pixel and the center pixel of the image.