CW-THz image contrast enhancement using wavelet transform and Retinex

Lin Chen; Min Zhang; Qi-fan Hu; Ying-Xue Huang; Hua-Wei Liang

doi:10.1117/12.2199505

8 October 2015 CW-THz image contrast enhancement using wavelet transform and Retinex

Lin Chen, Min Zhang, Qi-fan Hu, Ying-Xue Huang, Hua-Wei Liang

Proceedings Volume 9675, AOPC 2015: Image Processing and Analysis; 96751M (2015) https://doi.org/10.1117/12.2199505
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

To enhance continuous wave terahertz (CW-THz) scanning images contrast and denoising, a method based on wavelet transform and Retinex theory was proposed. In this paper, the factors affecting the quality of CW-THz images were analysed. Second, an approach of combination of the discrete wavelet transform (DWT) and a designed nonlinear function in wavelet domain for the purpose of contrast enhancing was applied. Then, we combine the Retinex algorithm for further contrast enhancement. To evaluate the effectiveness of the proposed method in qualitative and quantitative, it was compared with the adaptive histogram equalization method, the homomorphic filtering method and the SSR(Single-Scale-Retinex) method. Experimental results demonstrated that the presented algorithm can effectively enhance the contrast of CW-THZ image and obtain better visual effect.

Citation Download Citation

Lin Chen, Min Zhang, Qi-fan Hu, Ying-Xue Huang, and Hua-Wei Liang "CW-THz image contrast enhancement using wavelet transform and Retinex", Proc. SPIE 9675, AOPC 2015: Image Processing and Analysis, 96751M (8 October 2015); https://doi.org/10.1117/12.2199505

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available