Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Hierarchy of nonlocal means for preferred automatic sharpness enhancement and tone mapping

Not Accessible

Your library or personal account may give you access

Abstract

Existing hierarchical techniques that decompose an image into a smooth image and high frequency components based on Gaussian filter and bilateral filter suffer from halo effects, whereas techniques based on weighted least squares extract low contrast features as details. Other techniques require multiple images and are not tolerant to noise. We use a single image to enhance sharpness based on a hierarchical framework using a modified Laplacian pyramid. In order to ensure robustness, we remove noise by using an extra level in the hierarchical framework. We use an edge-preserving nonlocal means filter and modify it to remove potential halo effects and gradient reversals. However, these effects are only reduced but not removed completely after similar modifications are made to the bilateral filter. We compare our results with existing techniques and show better decomposition and enhancement. Based on validation by human observers, we introduce a new measure to quantify sharpness quality, which allows us to automatically set parameters in order to achieve preferred sharpness enhancement. This causes blurry images to be sharpened more and sufficiently sharp images not to be sharpened. Finally, we demonstrate applications in the context of robust high dynamic range tone mapping that is better than state-of-the-art approaches and enhancement of archaeological artifacts.

© 2013 Optical Society of America

Full Article  |  PDF Article
More Like This
Method for developing and using high quality reference images to evaluate tone mapping operators

Imran Mehmood, Xiaoxuan Liu, Muhammad Usman Khan, and Ming Ronnier Luo
J. Opt. Soc. Am. A 39(6) B11-B20 (2022)

Which tone-mapping operator is the best? A comparative study of perceptual quality

Xim Cerda-Company, C. Alejandro Parraga, and Xavier Otazu
J. Opt. Soc. Am. A 35(4) 626-638 (2018)

Adaptive method for image dynamic range adjustment and detail enhancement

Yi-Zheng Lang, Yun-Sheng Qian, Xiang-Yu Kong, and Jing-Zhi Zhang
Appl. Opt. 61(21) 6339-6348 (2022)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (24)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved