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Method for improving optical scanning holographic tomography effect

A tomography and optical scanning technology, applied in the field of optical scanning holographic tomography, can solve the problems of complexity, heavy computational workload and limited effect.

Inactive Publication Date: 2014-11-19
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are relatively complex, computationally intensive and have limited effects

Method used

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  • Method for improving optical scanning holographic tomography effect
  • Method for improving optical scanning holographic tomography effect
  • Method for improving optical scanning holographic tomography effect

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings, and a specific embodiment of the present invention will be described.

[0043] In this embodiment, a solid-state laser with an output power of about 20mW is used as a light source, and the light wavelength is , the focal length of lens L1 , the pupil size is ,like figure 2 The size of the three cross-sectional images of the simple 3D object model shown is ,in The distance between the cross-sectional image of the layer and the rear focal plane of the lens L1 is , the distance between adjacent cross-sectional images is .

[0044] The whole image reconstruction process can be realized as follows:

[0045] (1) Record the complex hologram in the encoding stage

[0046] At this stage, the exit surface of the spatial light modulator is selected as one of the pupil functions, and it is placed in the figure 1 On the front focal plane of the lens L1 shown in , the...

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Abstract

The invention discloses a method for improving an optical scanning holographic tomography effect, and belongs to the field of optical tomography. The method can solve the defect in the conventional optical scanning technology that restored section images have louder out-of-focus noise, in real time. The method comprises the following steps: utilizing a random phase in the optics encryption technique, changing a certain pupil function in a conventional optical scanning holographic system into a stochastic phase pupil function, and equaling restore of out-of-focus layer images into decryption under the condition of mistakenly decrypting a secret key, thereby enabling the out-of-focus layer images overlaid on the restored section images to be gaussian white noise with statistical independence and greatly reducing the influence of the out-of-focus noise on the focus layer images. Meanwhile the out-of-focus noise can also be filtered through design of a gaussian filter, so that the longitudinal resolution of the system can be improved; besides, through the adoption of the method, the bandwidth of the optical transfer function is wider, and the transverse resolution of the restored section images can be higher.

Description

technical field [0001] The invention belongs to the field of optical tomography, in particular to an optical scanning holographic tomography method. Background technique [0002] The traditional optical tomography technology mainly adopts layer-by-layer multi-scan recording method, so it takes a lot of time to scan layers at different axial positions. Poon proposed an unconventional digital holography—optical scanning holography (T.-C. Poon, “Scanning holography and two-dimensional image processing by acousticto-optic two-pupil synthesis,” J. Opt. Soc. Am. A 2, 621–627, 1985). This technology has a great advantage in terms of acquisition speed. Only a single two-dimensional optical heterodyne scan can obtain the data information of the entire three-dimensional object, and the cross-sectional images of different axial positions can be reconstructed through these data. It can be seen from the existing research that the optical scanning holography technology is one of the mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N13/00G03H1/10G06T5/00
Inventor 周昕王运呼有军
Owner SICHUAN UNIV
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