A Thresholding Method for Hadamard Coded Modulation Correlation Imaging

Abstract

The invention discloses a threshold value processing method of Hadamard code modulation correlation imaging, which determines the segmentation threshold according to the gray histogram characteristics of the reconstructed image obtained by Hadamard matrix modulation correlation imaging, and then uses the determined segmentation threshold to perform threshold segmentation processing on the target image , and then perform morphological filtering on the image after threshold segmentation processing. The morphological filtering includes: firstly, perform an erosion operation on the image after threshold segmentation processing to eliminate point noise in the image, and then perform an expansion operation to obtain a binarized target image Contour; finally, the contour of the target image is used to enhance the image after the threshold segmentation process, remove the peripheral point noise of the target image, and obtain a clear image. The threshold value processing method of the present invention has high feasibility, obtains an optical image enhancement close to 8dB, has relatively good effects on binary images and grayscale images, and effectively promotes the practical application of the correlation imaging technology.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a threshold value processing method of Hadamard coded modulation correlation imaging. Background technique [0002] Correlation imaging, also known as quantum imaging and ghost imaging, is a new technology that uses the correlation of spatial light field intensity fluctuations to achieve image reconstruction. Different from traditional optical imaging which uses "point-to-point" imaging to record target object information, correlation imaging uses a single-pixel detector (also known as a bucket detector) without spatial resolution to record the total intensity value of the light field containing object information. The modulated light field of the irradiated object is associated with the calculation to reconstruct the image information of the target object. [0003] Classical correlation imaging adopts a dual optical path scheme. After the modulated light field is split...

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Problems solved by technology

[0006] The object of the present invention is to provide a threshold value processing method for Hadamard coded modulation correlation imaging, which solves the problem of Hadamard transform base calculation correlation imaging. Due to the high brightness of the noise image and the relatively low brightness of the target image, the image information is submerged and a clear image cannot be obtained. problems to achieve high-efficiency imaging and promote the practical application of correlative imaging techniques

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