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Method and system for extending depth of field in optical imaging

An optical imaging system and optical imaging technology, applied in the field of expanding the depth of field of optical imaging, can solve the problems of high cost, complex process, high precision requirements, etc., and achieve the effect of reducing process cost and simple method

Active Publication Date: 2018-06-29
SHENZHEN UNIV
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Problems solved by technology

[0006] The present invention provides a method and system for extending the depth of field of optical imaging, aiming to solve the problems of high precision requirements, complicated process and high cost in the existing methods for increasing the depth of field

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  • Method and system for extending depth of field in optical imaging
  • Method and system for extending depth of field in optical imaging

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[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044]As the first embodiment of the present invention, such as figure 1 As shown, the present invention provides a method for expanding the depth of field of optical imaging, the method comprising:

[0045] Step S101: placing a thin scattering medium between the exit pupil of the original optical imaging system and the imaging surface, the thin scattering medium performs random phase modulation on the imaging wavefront at the exit pupil, and records the imaging surface with an image detector, Get a speckle image.

[0046] Step S102: Use the preset speckle correlation method to reconstruct and ca...

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Abstract

The invention belongs to the field of computational optical imaging, and particularly relates to a method and a system for extending the depth of field of optical imaging. According to the method, only a thin scattering medium needs to be placed between an exit pupil portion and an imaging plane of an original optical imaging system, imaging waves at the exit pupil portion are subjected to randomphase modulation by the thin scattering medium, speckle images are obtained by an image detector, the speckle images are reconstructed by a preset speckle correlation method, and a large image of thedepth of the field is obtained. Therefore, the method does not need a complex process precision design, is simple, and greatly reduces the process cost.

Description

technical field [0001] The invention belongs to the field of computational optical imaging, in particular to a method and system for extending the depth of field of optical imaging. Background technique [0002] Large depth of field has always been one of the research hotspots of imaging systems. For imaging systems, large depth of field means that there are more clear scenes in the same picture, which means more objects that can be measured, controlled and monitored. [0003] There are many ways to increase depth of field. For example: (1) For ordinary optical imaging systems, the most convenient way to increase the depth of field is to reduce the aperture of the aperture stop. The frequency will also drop accordingly, resulting in a decrease in image quality. (2) The use of circular lens is also a feasible method to increase the depth of field, but this method has higher requirements on the performance of the optical system. (3) There is also a series of out-of-focus im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0075
Inventor 彭翔廖美华卢大江何文奇刘晓利
Owner SHENZHEN UNIV
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