Abstract
Computational ghost imaging (CGI) is one of several attractive techniques for optical measurement because it can determine two-dimensional structures of target objects without using an image sensor. However, conventional CGI is not suitable for practical use in terms of measurement time. In this paper, we report on reducing the optical measurement time in CGI and propose a new CGI implementation. The proposed method utilizes the wide bandwidth of laser diodes. We can obtain a set of speckle patterns required in computational ghost imaging in a significantly shorter time by changing emission patterns. Consequently, this method is suitable for high-speed measurements. The concept of the method is described and verified by numerical analysis. Further, optical setup for the experimental verification is assembled. As verified with experiments and signal processing, the proposed method can provide reconstructed images of targets.
Highlights
Ghost imaging (GI) differs from conventional optical imaging in several important aspects
The structure of the target roughly appears in the reconstructed image, which shown that the modulation of the laser array is useful for the speckle pattern generation in Computational ghost imaging (CGI)
For image the target is in sparseness, DMD structures, is effective huger as a device change of speckle pattern.inOn theInother reconstruction of more complex timesfor measurements are required this hand, for image reconstruction of more complex structures, huger times measurements are required in CGI
Summary
Ghost imaging (GI) differs from conventional optical imaging in several important aspects. Signal processing for image reconstruction is conducted in accordance with the second order statistical properties of the speckle [4]. For thermal GI, several methods of signal processing for improving the image quality have been reported. Differential ghost imaging [7] can effectively improve the signal-to-noise ratio of the reconstructed images. Methods for remote sensing with CGI were reported in Refs. Reducing the optical measurement time is one of the most important issues in CGI. Reducing the optical measurement time is one of the most important issues. Wepropose propose a novel method to solve this issue. Specific speckle signals emitted by each element of the array are scattered by a phase modulator. The method suitable for both higher speed measurement and speckle illuminate patterns illuminate the target object.
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