Method for improving optical scanning holographic tomography effect

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...

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