Image Acquisition Lens Shading Correction Without Integrating Spheres
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Solution Overview
Problem
Traditional lens shading correction technologies using integrating spheres are costly and require frequent maintenance, necessitating a more economical and practical method for achieving uniform image brightness.
Innovation Solution
A system and method that adjusts the positional relationship between a light source and a correction reference, along with the illumination direction, to achieve uniform illumination on the correction reference, allowing an image acquisition device to capture images for lens shading correction without the need for an integrating sphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional integrating sphere device is used to obtain correction image, then lens shading correction can be achieved, but purchase cost and maintenance cost are high
Solution Approach 1:
The patent replaces the expensive integrating sphere device with a simple uniform light source system that can be easily manufactured and maintained. The light source, diffuser plate, and reference board form a low-cost alternative that achieves the same correction image acquisition function without requiring complex spherical integration optics
Solution Approach 2:
The patent creates a simplified optical model that copies the essential function of the integrating sphere - providing uniform illumination for correction image acquisition. By using a light source + diffuser + reference board configuration, it replicates the uniform light field effect without needing the actual integrating sphere structure
2Reliability
If integrating sphere device is used, then correction image can be obtained, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent extracts only the essential function needed from the integrating sphere system - uniform illumination for capturing correction images. It removes the complex spherical structure, integration optics, and associated maintenance requirements, keeping only the light source, diffuser, and reference board components
Solution Approach 2:
The patent divides the correction image acquisition system into simple, independent components: light source, diffuser plate, and reference board. Each component can be independently adjusted and replaced, simplifying the overall system architecture compared to the integrated complex structure of an integrating sphere
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the purchase and maintenance costs of testing devices while achieving high-quality lens shading correction, providing images with uniform brightness and improved accuracy of correction parameters.
Implementation Method 1
The light source is configured to adjust a positional relationship thereof relative to the correction reference and a direction in which the light source illuminates the correction reference, so that illuminations of light emitted by the light source in different regions on the correction reference meet a predetermined uniformity condition
Implementation Method 2
the at least one layer of diffuser includes several layers of flexible diffusers, and is configured to be symmetrically provided in an arc shape in front of the lens of the image acquisition device
Data Source
AI summary
The present application provides a system and a method for acquiring an image, an electronic device, and a computer-readable storage medium. The system for acquiring an image provided in the present application provides a correction reference with uniform illumination by adjusting the positional relationship between the light source and the correction reference, and acquires at least one image of the correction reference by the image acquisition device to be corrected. Wherein, the correction image obtained based on the at least one image may be used to perform lens shading correction on the image acquisition device. The system for acquiring an image does not require the use of an expensive integrating sphere, which may reduce purchase and maintenance costs of a testing device for obtaining a correction image.