Effects of the “Source/ surface” and “Surface/sensor” Coupling and Colorimetric of Laser Speckle Pattern on the Performance of Optical Imaging System

Document Type : Original Article

Authors

1 Engineering Physics Department, Military technical College, Cairo, Egypt.

2 Physics Department, Faculty of Sciences, Ain Shams University, Cairo, Egypt.

3 Computer Department, Military Technical College, Cairo, Egypt.

Abstract

Abstract
Optical imaging systems are widely used in different applications include tracking for portable scanners; input pointing devices for laptop computers, cell phones, and cameras, fingerprint-identification scanners, optical navigation for target tracking, and in optical computer mouse. We presented an experimental work to measure and analyze the laser speckle pattern (LSP) produced from different optical sources (i.e. various color LEDs, 3 mW diode laser, and 10mW He-Ne laser) with different produced operating surfaces (Gabor hologram diffusers), and how they affects the performance of the optical imaging systems; speckle size and signal-to-noise ratio (signal is represented by the patches of the speckles that contain or carry information, and noise is represented by the whole remaining part of the selected image). The theoretical and experimental studies of the colorimetry (color correction is done in the color images captured by the optical imaging system to produce realistic color images which contains most of the information in the image by calculating the RGB components) for the used optical sources are investigated and introduced to present the relations between the signal-to-noise ratios with different diffusers for each light source. From the experimental results, we found that the speckle size ranged from 4.59 to 4.62 m, which are slightly different or approximately the same for all produced diffusers. But, the calculated value of signal-to-noise ratio takes different values ranged from 0.69 to 0.92 for different diffuser, which means that surface texture will affects the performance of optical sensor based on laser speckle pattern used for optical imaging system.

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