Laser line scan underwater imaging by complementary metal–oxide–semiconductor camera

Zhiyi He; Meixing Luo; Xiyu Song; Dundong Wang; Ning He

doi:10.1117/1.OE.56.12.123101

1 December 2017 Laser line scan underwater imaging by complementary metal–oxide–semiconductor camera

Zhiyi He, Meixing Luo, Xiyu Song, Dundong Wang, Ning He

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), Natural Science Foundation of China, Innovation Project of GUET Graduate Education

Optical Engineering, Vol. 56, Issue 12, 123101 (December 2017). https://doi.org/10.1117/1.OE.56.12.123101

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.

Citation Download Citation

Zhiyi He, Meixing Luo, Xiyu Song, Dundong Wang, and Ning He "Laser line scan underwater imaging by complementary metal–oxide–semiconductor camera," Optical Engineering 56(12), 123101 (1 December 2017). https://doi.org/10.1117/1.OE.56.12.123101

Received: 11 July 2017; Accepted: 13 November 2017; Published: 1 December 2017

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