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Method and system for phase position unwrapping based on MRF

A phase unwrapping, true phase technology, applied in image data processing, instruments, calculations, etc., can solve the problem of inability to achieve residual point immunity, unable to restore the real phase, etc., and achieve the effect of good immunity

Active Publication Date: 2013-09-25
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] To sum up, none of the above PhU methods can achieve immunity to residual points, so that the real phase cannot be better recovered from the observed phase

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  • Method and system for phase position unwrapping based on MRF
  • Method and system for phase position unwrapping based on MRF
  • Method and system for phase position unwrapping based on MRF

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Embodiment Construction

[0051] The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0052] An MRF-based phase unwrapping method provided by an embodiment of the present invention, such as figure 1 As shown, it mainly includes the following steps:

[0053] Step 101, according to the characteristics of the real phase, the variable space formed by the real phase and the observed phase is modeled by MRF.

[0054] Specifically, the relationship between the observed phase and the real phase, such as figure 2 As shown in , the result of superimposing the phase noise on the real phase is obtained by the winding operation to obtain the observed phase. Set the real phase map as a discrete two-dimensional grid, each node in the discrete two-dimensional grid (each node represents each coordinate in the real phase map, and the value on each coordinate is a random variable, Estimating the real phase requires ...

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Abstract

The invention discloses a method and system for phase position unwrapping based on Markov random field (MRF). The method includes the steps that according to features of real phase positions, through MRF, modeling is carried out on the variable space formed by the real phase positions and observation phase positions; condition independence among all nodes on the MRF is analyzed, and according to the condition independence, the relation between the total joint probability distribution of the MRF and potential energy of the MRF is analyzed; according to the relation and the features of the real phase positions, the potential energy of the MRF is set and minimized to obtain estimated values of the real phase positions. The real phase positions can be recovered from the observation phase positions better.

Description

technical field [0001] The present invention relates to interferometric phase unwrapping (PhU, Phase Unwrapping) technology, in particular to a Markov Random Field (MRF, Markov Random Field)-based phase unwrapping method and system. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR, Interferometric Synthetic Aperture Radar) technology is a high-precision three-dimensional earth observation technology. In InSAR technology, Phase Unwrapping (PhU, Phase Unwrapping) is a key step. PhU is the process of recovering the real phase from the observed phase, where the value range of the observed phase is in the [-π, π] interval, and the value range of the real phase is the entire real number domain. [0003] The current PhU methods are mainly divided into two categories: the first category is the PhU method based on path integrals, and the second category is the PhU method based on norm estimation. In the first type of PhU method, the most important one is...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 陈润璞禹卫东邓云凯王宇刘悦邵云峰
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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