PSF fast calibration method based on single-lens imaging

A calibration method and single-lens technology, applied in image analysis, image communication, image data processing, etc., can solve the problems of slow PSF estimation speed and long time-consuming, reduce the size and weight of the lens, avoid duplication, and reduce the cost of the lens cost effect

Active Publication Date: 2014-06-11
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: aiming at the problem that PSF estimation speed is too slow and takes a long time in the existing single-lens imaging method, and PSF estimation is required for each single-lens, a PSF based on single-lens imaging is provided. Fast calibration method avoids repetition of PSF estimation process, greatly reduces lens cost while ensuring image quality, reduces lens volume and weight, and is convenient for users to use

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Embodiment Construction

[0032] Below in conjunction with above-mentioned accompanying drawing, the present invention is described in detail:

[0033] Such as Figure 6 As shown, the PSF rapid calibration method based on single-lens imaging provided in this embodiment includes the following steps:

[0034] Step 1: Under the normal camera aperture, use a single-lens camera to obtain a blurred image; reduce the aperture of the single-lens camera to the size of a pinhole to obtain a clear image. At this time, it can be considered that the blur caused by the single-lens aberration to the image is negligible;

[0035] Step 2: Divide the blurred image and the clear image into several image blocks of the same size, and estimate the PSF of the spatial variation of the single lens used. The PSF estimation method used here is an existing method. For specific steps, please refer to the literature [2] , this method takes a long time.

[0036] PSF estimation can be viewed as a deconvolution problem of known shar...

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Abstract

The invention discloses a PSF fast calibration method based on single-lens imaging. Firstly, PSF estimation is performed on a group of single lenses of the same type, and a PSF template of the single lenses of the type is obtained by obtaining the average value of a group of PSFs; when other lenses of the type are used, existing complicated PSF estimation methods do not need to be completely repeated, the PSF template serves as an initial value of the PSF estimation iterative optimization process, and time needed in the PSF estimation process can be reduced. According to the PSF fast calibration method based on single-lens imaging, on the basis of the existing single lens imaging algorithm, the PSF calibration speed is greatly improved, a user can conveniently use the method, practical operability is strong, the quality of images is ensured, meanwhile, the cost of the lenses is greatly reduced, the size and weight of the lenses are reduced, and the PSF fast calibration method is of greatly significance in the field of image processing and camera designing.

Description

Technical field: [0001] The invention mainly relates to the field of digital image processing, in particular to a PSF rapid calibration method for single-lens imaging. Background technique: [0002] At present, SLR cameras are playing an increasingly important role in people's daily life due to their advantages such as high-definition imaging quality, rich lens selection, fast response speed, and excellent manual control ability. However, in order to compensate for the geometric distortion and aberration of the lens in the SLR lens and further improve the imaging quality, the design of the SLR lens is becoming more and more complex, even including dozens of independent optical devices. While improving the imaging quality, complex lenses will undoubtedly increase the volume and weight of the lens, which will also greatly increase the cost of the lens. The increase in the size and weight of the lens has brought inconvenience to the daily use of users, and the increase in cost...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235G06T7/00
Inventor 刘煜张茂军李卫丽王炜熊志辉
Owner NAT UNIV OF DEFENSE TECH
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