Next Article in Journal
Probability Index of Low Stratus and Fog at Dawn using Dual Geostationary Satellite Observations from COMS and FY-2D near the Korean Peninsula
Next Article in Special Issue
Obtaining High-Resolution Seabed Topography and Surface Details by Co-Registration of Side-Scan Sonar and Multibeam Echo Sounder Images
Previous Article in Journal
Evaluation of Soil Moisture Variability in Poland from SMOS Satellite Observations
Previous Article in Special Issue
Estimation of Translational Motion Parameters in Terahertz Interferometric Inverse Synthetic Aperture Radar (InISAR) Imaging Based on a Strong Scattering Centers Fusion Technique
Article

A Gray Scale Correction Method for Side-Scan Sonar Images Based on Retinex

1
College of Automation, Harbin Engineering University, Harbin 150001, China
2
School of Management, Harbin University of Commerce, Harbin 150028, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(11), 1281; https://doi.org/10.3390/rs11111281
Received: 24 April 2019 / Revised: 23 May 2019 / Accepted: 25 May 2019 / Published: 29 May 2019
(This article belongs to the Special Issue Radar and Sonar Imaging and Processing)
When side-scan sonars collect data, sonar energy attenuation, the residual of time varying gain, beam patterns, angular responses, and sonar altitude variations occur, which lead to an uneven gray level in side-scan sonar images. Therefore, gray scale correction is needed before further processing of side-scan sonar images. In this paper, we introduce the causes of gray distortion in side-scan sonar images and the commonly used optical and side-scan sonar gray scale correction methods. As existing methods cannot effectively correct distortion, we propose a simple, yet effective gray scale correction method for side-scan sonar images based on Retinex given the characteristics of side-scan sonar images. Firstly, we smooth the original image and add a constant as an illumination map. Then, we divide the original image by the illumination map to produce the reflection map. Finally, we perform element-wise multiplication between the reflection map and a constant coefficient to produce the final enhanced image. Two different schemes are used to implement our algorithm. For gray scale correction of side-scan sonar images, the proposed method is more effective than the latest similar methods based on the Retinex theory, and the proposed method is faster. Experiments prove the validity of the proposed method. View Full-Text
Keywords: side-scan sonar image; gray scale correction; Retinex; image enhancement side-scan sonar image; gray scale correction; Retinex; image enhancement
Show Figures

Graphical abstract

MDPI and ACS Style

Ye, X.; Yang, H.; Li, C.; Jia, Y.; Li, P. A Gray Scale Correction Method for Side-Scan Sonar Images Based on Retinex. Remote Sens. 2019, 11, 1281. https://doi.org/10.3390/rs11111281

AMA Style

Ye X, Yang H, Li C, Jia Y, Li P. A Gray Scale Correction Method for Side-Scan Sonar Images Based on Retinex. Remote Sensing. 2019; 11(11):1281. https://doi.org/10.3390/rs11111281

Chicago/Turabian Style

Ye, Xiufen, Haibo Yang, Chuanlong Li, Yunpeng Jia, and Peng Li. 2019. "A Gray Scale Correction Method for Side-Scan Sonar Images Based on Retinex" Remote Sensing 11, no. 11: 1281. https://doi.org/10.3390/rs11111281

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop