Image reconstruction using different speckles and methods

Abstract

Ghost imaging (GI) is an imaging method that uses photon correlation for image restoration. In this study, we design two different color speckle fields and use a digital light projector to display them onto a color object that is measured by a single-pixel photodetector. The first is uniformly distributed with red, green, and blue colors, while patterns are generated through linear mapping of a Hadamard matrix in the second. We evaluated three original image reconstruction schemes based on multi-color speckle (MS) pattern: traditional ghost imaging and pseudo-inverse ghost imaging based on uniform speckle field and single-pixel imaging (MS-HSI) based on Hadamard matrix linear mapping speckle field. Simulation and experimental results show that these methods can effectively restore color objects. We also compare the advantages and disadvantages of the three methods, and optimize the GI strategy of color objects. Among the three methods, the background noise of MS-HSI based on Hadamard matrix linear mapping is lower, more details are retained, and the signal-to-noise ratio is the highest.

Real single-channel color image encryption method based on computational ghost imaging

“…To better explain the color CGI encryption process, we use a mathematical model of matrix operations to describe it. For a color plaintext image P of size m × n × 3, it can be composed of three grayscale images P r , P g and P b of size m × n, which represent the red, green and blue channels of the color image [27,28]. The measurement matrix S consists of color speckle patterns S 1 , S 2 , .…”

Resolution-enhanced single-pixel imaging using the Hadamard transform matrix

“…In the following study, except for the above basis patterns used in SPI, some schemes have been proposed to generate various customized speckle fields. [46][47][48][49][50][51] In 2014, Cao's group proposed a versatile method for generating non-Rayleigh speckle patterns. The method involves encoding higher-order correlations into the optical by the phase-only SLM which results in a redistribution of light intensity among the speckle grains in the far field.…”