A Chromatic Aberration Compensation Method Based on AOTF Multispectral Imaging System
A technology of multi-spectral imaging and compensation method, which is applied in the field of automatic focusing system and new image quality evaluation algorithm to achieve the effect of reducing cost, simplifying the system and reducing the amount of calculation.
Inactive Publication Date: 2017-05-10
ZHONGBEI UNIV
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[0004] Aiming at the difference in the focal length of the lens corresponding to the clear image of different wavelengths caused by dispersion in the existing AOTF multi-spectral imaging system, an automatic focusing system with a new image definition evaluation algorithm as the core is proposed to compensate the chromatic aberration of the imaging system
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[0036] The following embodiments describe the present invention in further detail in conjunction with the accompanying drawings.
[0037] The automatic focusing system used in the present invention controls the stepper motor to drive the lens focusing ring to rotate through a novel image definition evaluation algorithm and a focal length search algorithm.
[0038] Image quality evaluation is usually characterized by SSIM parameters. SSIM parameters are used to measure the similarity between the image to be tested and the reference image, and the proportion of different factors can be adjusted to achieve the quality evaluation of the image to be tested compared to the reference image. Specifically defined as:
[0039] (1)
[0040] in: , , (2)
[0041] In the formula: , , Respectively correspond to the brightness, contrast and structure correlation functions between the reference target and the target to be measured; , is the mean value of the brightness cor...
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The invention relates to a novel image quality evaluation algorithm based on the imaging characteristics of an AOTF multispectral imaging system, which belongs to the technical field of the AOTF multispectral imaging system; it is carried out according to the following steps: the target object enters the AOTF spectroscopic through the lens, and the +1 order diffracted light passes through the rear The imaging lens group is imaged on the CCD focal plane, and the FPGA of the hardware circuit controls the timing of the CCD detector, and the image data collected and stored is transmitted to the DSP of the hardware circuit through the control, and the DSP obtains the image quality evaluation result through the image quality evaluation algorithm. And this result is fed back to FPGA, and FPGA controls the stepper motor to drive the lens focus ring to rotate according to the result, and realizes the focal length control of imaging under different wavelengths, so that each band of the AOTF multispectral imaging system can image clearly; the present invention is mainly used in AOTF multispectral imaging system.
Description
technical field [0001] The invention relates to a new image quality evaluation algorithm based on the imaging characteristics of the AOTF multi-spectral imaging system. It is an automatic focusing system that can accurately obtain a clear image of a certain wavelength of incident light after AOTF diffraction according to the algorithm, and compensate for the chromatic aberration of the system. The invention belongs to the technical field of AOTF multispectral imaging system. Background technique [0002] Multi-spectral imaging technology and systems have a wide range of applications and urgent needs in aerospace, scientific research, environmental monitoring, military and chemical analysis. As a new type of spectroscopic device, AOTF has the advantages of large aperture, high diffraction efficiency, electronically controlled scanning, fast wavelength switching, no mechanical moving parts, small size, light weight, and easy system miniaturization. The field has incomparable ...
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IPC IPC(8): G01J3/28G01J3/02G02B7/36
Inventor 王耀利张瑞王志斌李晋华张敏娟陈媛媛李世伟宋雁鹏
Owner ZHONGBEI UNIV