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An optical image phase unwrapping method based on a U-Net segmentation network

A phase unwinding, optical image technology, applied in image enhancement, image analysis, image data processing, etc., to achieve the effect of high solution accuracy, strong pertinence, and high pixel segmentation accuracy

Active Publication Date: 2019-06-14
HANGZHOU DIANZI UNIV
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Problems solved by technology

How to better solve the unwrapping of optical phase is a problem worth exploring

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  • An optical image phase unwrapping method based on a U-Net segmentation network
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  • An optical image phase unwrapping method based on a U-Net segmentation network

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Embodiment

[0060] The training set used in the embodiment of the present invention is an optical image generated by Zernike polynomials similar to those shown in Fig. 1(a), Fig. 1(b) and Fig. 1(c). Then follow step 2 to generate the corresponding phase-wrapped images. After the model training in step 3, use the learned network for testing. The final test results are shown in Figure 3(a), Figure 3(b), Figure 3(c) and Figure 3(d).

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Abstract

The invention discloses an optical image phase unwrapping method based on a U-Net segmentation network. The method comprises the following steps of step 1, generating an optical image with an unwoundphase by using a Zernike polynomial; step 2, performing phase winding operation by using the optical image with the unwound phase to obtain a phase winding image; step 3, training the model by using aU-Net segmentation network; and step 4, performing optical image phase unwrapping by using the trained model. According to the method, the U-Net segmentation network is utilized, and the method is high in pertinence and mainly aims at phase unwrapping of optical images. The phase unwrapping method based on the U-Net segmentation network has a great application prospect in the field of optical imaging research, and the pixel segmentation accuracy is very high, so that the solving accuracy is also very high. And meanwhile, the solving time is only 0.037 second in the environment of CPU (centralprocessing unit) i5-8600 K and GPU NVIDIA TITAN Xp.

Description

technical field [0001] The invention belongs to the field of image phase unwrapping, especially for optical images, and in particular relates to an optical image phase unwrapping method based on a U-Net segmentation network. Background technique [0002] In many cases, the signal obtained by optical imaging is in complex form, including amplitude value and phase value. However, when the real phase is extracted from the complex signal, the phase value will be limited to the interval [-π, π], and the real phase outside this interval will be wound into this interval. This phenomenon is called phase winding, and the resulting phase is called a wrapped phase. Deriving the true phase from the wrapped phase is called phase unwrapping. [0003] There are mainly three types of existing phase unwrapping methods. The first method is branch tangent method based on discrete particle swarm optimization algorithm. This method first divides the residuals of the entire image into several...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 颜成钢张腾张永兵李志胜陈立鑫孙垚棋张勇东
Owner HANGZHOU DIANZI UNIV
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