Anti-scattering imaging method and device
An imaging method and anti-scattering technology, applied in the field of computational photography, can solve problems such as inaccurate phase information, inability to know the specific position of the target, and unsatisfactory recovery results of the phase recovery algorithm.
Active Publication Date: 2020-10-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
First of all, the phase recovery algorithm depends on the amplitude information, if the amplitude is inaccurate, the phase information will not be accurate; secondly, most of the phase recovery algorithms do not recover the results ideally, and can only reconstruct the original target with a simple structure, and cannot know the target The specific position in the background; finally, the anti-noise performance of the phase recovery algorithm is not ideal. Due to the limitation of shooting hardware, when the speckle image is noisy, it will greatly affect the reconstruction quality
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[0061] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.
[0062] The anti-scatter imaging method and device proposed according to the embodiments of the present application will be described below with reference to the accompanying drawings.
[0063] figure 1 It is an exemplary flowchart of an anti-scatter imaging method according to an embodiment of the present application. Such as figure 1 As shown, the anti-scatter imaging method includes:
[0064] Step 101, acquiring a speckle pattern.
[0065] Specifically, a detector is used to collect a single speckle image of a target s...
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The invention provides an anti-scattering imaging method and device. The method comprises the following steps: obtaining a speckle pattern; calculating autocorrelation information of the speckle pattern, performing Fourier transform on the autocorrelation information, and taking a modulus value to obtain original target Fourier domain amplitude information; partitioning the speckle pattern to obtain N sub-speckle patterns, and calculating a bispectrum by utilizing the N sub-speckle patterns to obtain a bispectrum phase, wherein N is a positive integer; calculating an initial estimation value of the original target Fourier domain phase according to the bispectral phase, and performing iterative optimization on the initial estimation value by using a Gaussian Newton optimization method to obtain a high-precision Fourier domain phase; and reconstructing an original target image according to the original target Fourier domain amplitude information and the high-precision Fourier domain phase. Therefore, original target information can be reconstructed from a single speckle pattern, the amplitude and the phase recovery process are independent of each other, the phase recovery precision is high, and the noise immunity is high.
Description
technical field [0001] The present application relates to the technical field of computational imaging, in particular to an anti-scatter imaging method and device. Background technique [0002] When there is an obstructed scattering medium in free space, such as heavy fog, biological tissue, etc., due to the inhomogeneity of the medium, the photon interacts with it and changes its propagation direction. This interaction is often multiple and non-deterministic, eventually leading to randomization of the light path, i.e. scattering. From a visual point of view, light will lose the target information it carries after passing through a strong scattering medium. The image produced by the device after capturing the scattered light consists of countless random spots called a speckle pattern. [0003] Many methods for imaging through scattering media have been developed. However, most methods require intrusion into the original target plane or the placement of "guide stars", and ...
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Login to View More IPC IPC(8): G01N21/47G01J9/02
CPCG01N21/4788G01J9/02G01N2021/479G01J2009/0238
Inventor 边丽蘅常旭阳张军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY