High-universality automatic hologram reestablishing method based on new focus evaluation function

A technology focusing on evaluation functions and holograms, applied in 3D modeling, image data processing, instruments, etc., can solve the problems of unfavorable real-time performance and time-consuming

Inactive Publication Date: 2014-07-09
TIANJIN POLYTECHNIC UNIV
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The sensitivity and unimodality of the frequency domain method are better, but for the reconstruction ...

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  • High-universality automatic hologram reestablishing method based on new focus evaluation function
  • High-universality automatic hologram reestablishing method based on new focus evaluation function
  • High-universality automatic hologram reestablishing method based on new focus evaluation function

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Embodiment Construction

[0029] The estimation method of the present invention is used to reconstruct the holograms of 10 submarine shots with different structural complexity. The images were all taken in the deep sea by the Marine Laboratory of the University of Aberdeen in the United Kingdom, and the types of microorganisms photographed by them are complicated. It is automatically reconstructed, and the reconstruction distance obtained is listed in Table 1.

[0030] Table 1 Target reconstruction distance table

[0031]

[0032] It can be seen from the data in Table 1 that, for 10 holograms, the target reconstruction distance determined by the method of the present invention basically coincides with its real reconstruction distance. It shows that the method of the present invention has a better effect on the automatic reconstruction of holograms, and has better versatility and practicability.

[0033] Experimental results show that: the method of the present invention uses the local variance dis...

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Abstract

The invention provides an automatic hologram reestablishing method. According to the method, at first, a focus evaluation function is designed and can reflect image detail information and the anti-noise property advantage of a variance by utilizing local variance distribution, and the standard deviation of the local variance distribution serves as an index judging the image clarity degree, so that realization of automatic reestablishment becomes possible; secondly, a decision strategy is designed and used for deciding which performance of a focus function value serves as reaction of the target reestablishment distance, and a maximum value of the function value is adopted as a reaction value of the target reestablishment distance; finally, the separation distance is discussed, the separation distance is the step side in search and directly influences the real-time property of automatic reestablishment, a strategy of gradually refining the separation distance from big to small and carrying out feedback in time is adopted for carrying out research, and therefore the operation efficiency is improved. The method can achieve high-accuracy automatic reestablishment and has certain real-time property and universality.

Description

technical field [0001] The present invention relates to a method for realizing automatic operation of holograms, specifically, using image detail features to establish a focus evaluation function, then making an appropriate decision strategy by analyzing the performance of the focus evaluation function, and finally through intelligent selection The method of searching the step size automatically reconstructs the hologram, and the focusing function is one of the key technologies for this goal. This method can realize more accurate and real-time automatic reconstruction of underwater holograms. Background technique [0002] Compared with other imaging technologies, digital holographic imaging technology can record samples non-destructively and non-invasively, and realize three-dimensional spatial reconstruction of the real world. With the development of computer and CCD technology, optical holography and digital holography are playing an increasingly important role in the rea...

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Application Information

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IPC IPC(8): G06T17/00
Inventor 汤春明刘玉翠王金海陈纯凯李光旭
Owner TIANJIN POLYTECHNIC UNIV
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