Optical and digital combined design method of digital imaging system

Abstract

The invention relates to an optical and digital combined design method of a digital imaging system. The method comprises the steps that by analyzing the difficulty degree of digitally processing imaging definition losses caused by compensation of chromatic aberration, out-of-focus, distortion, astigmatism, coma, curvature of the field and spherical aberration, aberration difficult to compensate for through digital processing is corrected through optical design, and aberration easy to compensate for through digital processing is corrected through an image processing algorithm; optical and digital combined iterative optimization design of the digital imaging system is achieved by modeling imaging target prior information, an optical imaging system, a digital processing system and combined design performance indexes. In this way, strict restriction on the optical system is relaxed, the complexity of the optical system is lowered, and global optimization of optical design and digital processing is achieved.

Description

technical field [0001] The invention relates to an optical and digital joint design method of a digital imaging system. Background technique [0002] With the rapid development of electronic technology and material technology, the imaging system has been developed from silver halide film imaging to digital imaging. Now the traditional digital imaging system is mainly composed of optical system and detector system. The target is imaged on the CCD or A digital image is formed on the COMS detector, and people then use image processing algorithms to correct the digital image more or less according to the application requirements, and digital image processing is not a necessary part of the traditional digital imaging system. In a certain sense, the characteristics of the so-called "digital" imaging have been lost, and all the advantages of digital imaging have not been fully excavated. [0003] The traditional digital imaging system design method is mainly divided into two steps...

AI Technical Summary

Problems solved by technology

[0004] The traditional design method makes the quality of the optical system design the only link that determines the image quality. In order to "perfectly" correct the aberration, the optical lens usually needs to be composed of multiple lenses, and the curvature of the lens may also be aspherical, which leads to lens processing, assembly, etc. It is extremely difficult to adjust and detect, which makes the imaging system large in size and weight, long in development cycle, and high in cost

However, no matter how many lenses there are and how complex the curvature is, it is far less than the number of various order aberrations. Each aberration will still have a certain amount of residue, which will affect the clarity of the image.

In addition, although the digital processing method of sharpening to improve contrast and smoothing to improve the signal-to-noise ratio can be used to improve the image clarity, the improvement of the signal-to-noise ratio and the improvement of the contrast are mutually restricted, and it is difficult to take care of each other. Adding the average will inevitably reduce the contrast, and the introduction of convolution algorithm for image sharpening will inevitably amplify the noise or introduce new noise

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