Image Enhancement of Wireless Capsule Endoscopy Frames Using Image Fusion Technique

Abstract

Volume restriction, low battery capacity and low focal length camera in Wireless Capsule Endoscopy (WCE) result in images being of lower contrast, darkness, un-even brightness and image degradations. In this paper, a Laplacian pyramid based Image fusion of Contrast Limited Adaptive Histogram Equalization (CLAHE) and Multi-Scale Retinex with Colour Restoration (MSRCR) to integrate information of both techniques have been proposed. The proposed technique combines the information from CLAHE and MSRCR, reduces uncertainties, redundancy and maximizes the information. Experimental evaluation reveals that the proposed method outperforms existing methods in terms of Peak Signal to Noise Ratio and Structural Similarity Index Measure.

KEYWORDS:

• Image enhancement
• Image fusion
• Image quality metrics
• Laplacian pyramid
• Retinex
• Wireless capsule endoscopy

Acknowledgements

The authors would like to thank Dr. Ravindra B.S, Sr. Consultant Gastroenterologist, Dr. Nagabhushan J.S, Sr. Consultant in Gastrointestinal and Colorectal Surgery and the team from BGS Global Hospitals, Bangalore, India for providing real-time capsule endoscopy videos. We sincerely acknowledge and are grateful for their guidance and suggestions.

Additional information

Notes on contributors

V. Vani

V Vani obtained her BE degree in electronics & communication Engineering at Dayananda Sagar College of Engineering; MTech in VLSI design and embedded systems from UTL Technologies, VTU. Presently, she is working as an assistant professor in Dept. of Electronics & Communication and a research scholar working under the guidance of Dr K V Mahendra Prashanth in the Dept. of Electronics & Communication Engineering, SJB Institute of Technology, Kengeri, Bengaluru, India. Corresponding author. Email: [email protected]

K. V. Mahendra Prashanth

Dr K V Mahendra Prashanth obtained his BE degree in electronics & communication engineering at National Institute of Engineering, Mysore; ME degree in power electronics from UVCE Bangalore. He received his PhD degree in electronics & communication engineering from VTU. Presently, he is working as professor in Department of Electronics & Communication Engineering, Chief Coordinator for R&D and PG programmes at SJBIT, Bangalore. Two technical papers authored by him are adjudged as the top two papers as per the survey report issued by BIOMED publications. He is the Member of IEEE, Acoustical Society of India, ISTE, IEI, and IIAV. Email: [email protected]