Edge Detection Of Image Watermarking And Fusion Based On Single-pixel Imaging

In recent years,correlated imaging(ghost imaging)has developed rapidly,which has injected fresh vitality into traditional imaging.Ghost imaging is a new type of optical imaging technology proposed in recent years to reconstruct object images through intensity correlation.Single-pixel imaging is developed on the basis of ghost imaging.Based on the principle of correlation measurement,the object is imaged by collecting the light intensity information of the object collected by the single-pixel detector.For some bands where the area array detector technology is immature,single-pixel imaging technology has application advantages.However,single-pixel imaging technology has fewer applications in long-distance imaging and edge detection.In order to promote the application of single-pixel imaging in this aspect,this paper studies the computational ghost imaging of black body radiation incoherent light(single-pixel imaging)and realizes the edge detection of fusion watermark based on single-pixel imaging.Ghost imaging has application prospects in long-distance imaging.In order to promote the application of sunlight single-pixel imaging in this field,this paper studies the computational ghost imaging based on the incoherent light radiated by blackbody.Firstly,according to the intensity probability density function of blackbody radiation,the expression of contrast-to-noise ratio describing the quality of ghost imaging is obtained,and then the slicing sampling idea is fused to generate the simulation image.Finally,the random modulated light of the simulated blackbody radiation light source is modulated by the digital light projector,which is used as the light source to realize the computational ghost imaging of the reflective object in the experiment.The ghost images of the object under different measurement frames are reconstructed,and the contrast-to-noise ratio describing the imaging quality is measured.The results show that the image quality is relatively good when the average intensity of the randomly modulated speckle is about 160.On the other hand,the contrast to noise ratio of the image increases with the increase of the number of measured frames.The experimental results are consistent with the theoretical analysis.The results are of great significance for the application of ghost imaging in the field of long-distance imaging.On the basis of Fourier single-pixel imaging,this paper proposes an imaging scheme that directly realizes the edge detection of the object fusion watermark without obtaining the image information of the object in advance.It can be called the edge detection technology of the Fourier single-pixel imaging fusion watermark.Based on the four-step phase shift principle,the Fourier structured light loaded with the watermark is irradiated on the target object,and the reflected light intensity is measured by a single-pixel detector,so as to obtain the Fourier spectrum of the edge of the object fusion watermark image.It does the inverse Fourier transform,and finally obtains the image of the edge of the object after the fusion watermark.Specifically:first,the theoretical formula for edge detection of Fourier single-pixel imaging fusion watermarking is derived,and the imaging under the conditions of different watermark DC components is simulated,and the structural similarity index(SSIM)of the image is calculated,it is found that as the DC component of the watermark increases,the SSIM decreases.Finally,the edge reconstruction of the image with a resolution of64*64 pixels fused with watermarks is realized on experimentally.The results show that as the DC component of the watermark increases,the weight of the edge information of the watermark displayed in the final fused image becomes smaller and smaller.This technology provides new ideas and expands new ways for the application of single pixel in image information steganography and marginal processing.