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Regional interpolation method for super-resolution reconstruction of synchronous phase shift interferogram

An interpolation method and a technology of synchronous phase shifting, applied in image data processing, graphics and image conversion, instruments, etc., can solve problems such as lack of resolution of synchronous phase shifting interferograms, reduce computational complexity, reduce instantaneous field of view errors, The effect of increasing sample points

Pending Publication Date: 2022-03-01
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0004] Aiming at the problem of lack of resolution of the synchronous phase-shift interferogram existing in the existing sub-focus plane phase shift technology, the present invention provides an interpolation method for super-resolution reconstruction of the sub-area synchronous phase-shift interferogram

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  • Regional interpolation method for super-resolution reconstruction of synchronous phase shift interferogram
  • Regional interpolation method for super-resolution reconstruction of synchronous phase shift interferogram
  • Regional interpolation method for super-resolution reconstruction of synchronous phase shift interferogram

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[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.

[0035] A subregional synchronous phase-shifting interferogram super-resolution algorithm, see figure 1 , follow these steps:

[0036] Step 1: The DoFP polarization original image is collected by the focal plane polarization camera (see Figure 2A ), and extract the low-resolution images of four different polarization directions required for interpolation according to the arrangement positions of the microlens array corresponding to different polarization angles. Refer to 2B~2E, and extract the images of four polarization directions as I 0 , I 45 , I 90 , I 135 .

[0037] Step 2: Divide four low-resolution images with different polarization directions into 2*2 block areas. If the size of the low-resolution image is m*n, the entire image is divided into (m*n) / 4 block areas in total. , and calculate the corresponding smoothness for each block...

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Abstract

The invention discloses a regional interpolation method for super-resolution reconstruction of a synchronous phase shift interferogram, and relates to the technical field of synchronous polarization imaging information processing. In the prior art, the resolution of a synchronous phase shift interferogram is lost. The invention provides a regional interpolation method for super-resolution reconstruction of a synchronous phase shift interferogram, and the method comprises the following steps: firstly inputting four low-resolution images in different polarization directions, then dividing all the low-resolution images into 2 * 2 block regions, calculating the smoothness P of each block region and the smoothness threshold Pmedian of the image, comparing the smoothness P with the smoothness threshold Pmedian, and calculating the interpolation of the super-resolution reconstruction of the synchronous phase shift interferogram. The method comprises the following steps: obtaining a smooth region and a non-smooth region, carrying out interpolation on the smooth region by using a weighted linear interpolation method, carrying out interpolation on the non-smooth region by using a multi-sampling cyclic convolution algorithm, and ending the interpolation operation of the whole sub-region after the interpolation of all block regions is completed. According to the interpolation method provided by the invention, the instantaneous field-of-view error caused by the focal plane splitting system is effectively reduced, and the polarization image with higher resolution is reconstructed.

Description

technical field [0001] The invention relates to the technical field of synchronous polarization imaging information processing, in particular to an interpolation method for super-resolution reconstruction of subregional synchronous phase shift interferograms. Background technique [0002] When measuring the surface shape of optical components, it is generally necessary to obtain 3 or 4 phase-shifted images collected synchronously in different polarization directions, so that a three-step or four-step phase-shift algorithm is used to solve the phase information, and finally Fitting solves the surface shape information of the component to be tested. At present, the main measurement methods are time-sharing measurement, amplitude-sharing measurement and aperture-division measurement. The time-sharing measurement method is a non-real-time synchronous measurement and can only measure stationary targets, which greatly limits the application range of this measurement method. . At...

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Application Information

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IPC IPC(8): G06T3/40
CPCG06T3/4007G06T3/4053
Inventor 田爱玲王思淇王红军刘丙才朱学亮朱亚辉王凯
Owner XIAN TECHNOLOGICAL UNIV
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