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Kalman filtering phase unwrapping method having heapsort function in embedded manner

A Kalman filter and phase unwrapping technology, applied in the field of phase unwrapping, can solve the problems of time consumption, efficiency reduction and practicability

Inactive Publication Date: 2016-06-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Kalman filter phase unwrapping method based on the quality-guided strategy needs to continuously search for the best pixel to be unwrapped during the phase unwrapping process, and a lot of time is consumed in the path search process, which reduces the efficiency and practicability of this method

Method used

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  • Kalman filtering phase unwrapping method having heapsort function in embedded manner
  • Kalman filtering phase unwrapping method having heapsort function in embedded manner
  • Kalman filtering phase unwrapping method having heapsort function in embedded manner

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Embodiment 1

[0082] Embodiment 1 of the Kalman filter phase unwrapping method embedded in heap sorting, phase unwrapping is performed on interferograms of mountainous terrain scenes, figure 1 It is the simulated real interferometric phase map of the mountainous terrain scene, its abscissa is the pixel in the distance direction, and the ordinate is the pixel in the azimuth direction, and the gray scale represents the interferometric phase value, and the unit is radian; figure 2 is the phase map of the winding phase with noise in the mountainous terrain scene, the vertical and horizontal coordinates and figure 1 Same, its signal-to-noise ratio is 0.73dB. Before phase unwrapping, use a mean filter (3×3) to figure 2 After filtering, we get image 3 , the vertical and horizontal coordinates and figure 1 same. This example is because figure 1 The real interferogram has dense local fringes, and the filter window of 3×3 is used to filter out the interference noise better. However, filtering...

Embodiment 2

[0135] Embodiment 2 of the Kalman filter phase unwrapping method embedded in heap sorting, phase unwrapping for the Etna volcano interferogram, Figure 20 As part of the Etna volcano interferogram, Figure 21 for Figure 20 The resulting entanglement interferogram after filtering.

[0136] The 5 steps described in Example 1 are used to unfold the interferogram, and then the phase diagram unfolded by the method of the present invention is rewound. The similarity between the fringes of the rewound pattern and the fringes of the original winding phase diagram can reflect the phase unwrapping method of the present invention. effectiveness. The results of phase unwrapping and the rewinding phase diagram of this example are shown in Figure 22 and 23 , it can be seen that the phase is continuous and smooth after the method of the present invention is unfolded, and the fringe of the rewound phase pattern is the same as that of the original entangled phase pattern ( Figure 21 ) ...

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Abstract

The invention provides a Kalman filtering phase unwrapping method having a heapsort function in an embedded manner. An interferometric phase quality map used for guiding a phase unwrapping path can be generated. A heap array based on a complete binary tree is introduced, and the interferometric phase quality value can be used as the ordering key word. The non-boundary image element having the highest phase quality in the interferometric image can be selected, and the adjacent coiled image element can be embedded in the heap array, and the maximum heap can be formed after being adjusted. The interferometric phase value of the optimal to-be-unwrapped image element X of the maximum heap root knot part can be estimated by the Kalman filtering method, and then the unwrapped image element X can be eliminated from the heap array, and maximum heap can be formed after being adjusted. The coiled image element of the adjacent image element x in the interferometric image can be embedded in the heap array, which can be adjusted to be the maximum heap. The previous step can be repeated, till all of the image elements of the heap array are unwrapped, and the unwrapping can be completed. The rapid inserting the rapid ordering of the to-be-unwrapped image elements can be realized, and the coiled phases can be unwrapped along the path from the high quality to the low quality of the interferometric image by adopting the Kalman phase unwrapping method, and the searching consumption time can be reduced, the efficiency and the precision are high, and the stability is strong.

Description

technical field [0001] The invention relates to a phase unwrapping technology, in particular to a Kalman filter phase unwrapping method embedded in heap sorting. Background technique [0002] The phase unwrapping technique can restore the real interferometric phase from the main value interval (-π, π] of the interferogram modulo 2π mapping, and is widely used in digital holographic microscopy, magnetic resonance imaging processing, speckle imaging, optical interferometry, adaptive Optics, synthetic aperture radar interferometry, etc. The traditional phase unwrapping methods mainly include the following categories: 1) The phase unwrapping method based on the path tracking strategy represented by the classic Goldstein branch-cut method and the mass-guided method; Minimum norm phase unwrapping method represented by multiplication, including pre-conjugate gradient method, Picard iterative method, Gauss-seidel relaxation iterative method, multi-grid method and other methods; 3) p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G01S13/90
CPCG01S13/9023G06T2207/20024G06T5/70
Inventor 谢先明李莹慧
Owner GUILIN UNIV OF ELECTRONIC TECH
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