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Optical Engineering • new

Laser line scan underwater imaging by complementary metal–oxide–semiconductor camera
Author(s): Zhiyi He; Meixing Luo; Xiyu Song; Dundong Wang; Ning He
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Paper Abstract

This work employs the complementary metal–oxide–semiconductor (CMOS) camera to acquire images in a scanning manner for laser line scan (LLS) underwater imaging to alleviate backscatter impact of seawater. Two operating features of the CMOS camera, namely the region of interest (ROI) and rolling shutter, can be utilized to perform image scan without the difficulty of translating the receiver above the target as the traditional LLS imaging systems have. By the dynamically reconfigurable ROI of an industrial CMOS camera, we evenly divided the image into five subareas along the pixel rows and then scanned them by changing the ROI region automatically under the synchronous illumination by the fun beams of the lasers. Another scanning method was explored by the rolling shutter operation of the CMOS camera. The fun beam lasers were turned on/off to illuminate the narrow zones on the target in a good correspondence to the exposure lines during the rolling procedure of the camera’s electronic shutter. The frame synchronization between the image scan and the laser beam sweep may be achieved by either the strobe lighting output pulse or the external triggering pulse of the industrial camera. Comparison between the scanning and nonscanning images shows that contrast of the underwater image can be improved by our LLS imaging techniques, with higher stability and feasibility than the mechanically controlled scanning method.

Paper Details

Date Published: 1 December 2017
PDF: 7 pages
Opt. Eng. 56(12) 123101 doi: 10.1117/1.OE.56.12.123101
Published in: Optical Engineering Volume 56, Issue 12
Show Author Affiliations
Zhiyi He, Guangxi Key Lab. of Wireless Wideband Communication and Signal Processing (China)
Meixing Luo, Guangxi Key Lab. of Wireless Wideband Communication and Signal Processing (China)
Xiyu Song, Guangxi Key Lab of Wireless Wideband Communication and Signal Processing (China)
Dundong Wang, Guangxi Key Lab. of Wireless Wideband Communication and Signal Processing (China)
Ning He, Guangxi Key Lab. of Wireless Wideband Communication and Signal Processing (China)


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