Regular Articles

Human vision-based detection of nonuniform brightness on liquid crystal display panels

[+] Author Affiliations
Jee Hong Kim

Pukyong National University, Department of Image Systems Engineering, Yongdang, Nam-ku, Busan, Korea 608-739

J. Electron. Imaging. 17(3), 033001 (August 28, 2008). doi:10.1117/1.2952589
History: Received September 18, 2006; Revised October 04, 2007; Accepted January 04, 2008; Published August 28, 2008
Text Size: A A A

We propose a method using a machine vision technique to detect the defects caused by spatially non-uniform brightness on LCD panels. The detection method is based on human vision, so subjective experiments were conducted to investigate the correlation between the parameters related to non-uniformity and the degree of easy observability. The visibility of the defects depends mainly on the spatial gradient of luminance variation. The proposed method uses the spatial gradient calculated using extracted contours to detect the defects caused by non-uniform brightness. The detection method is composed of four parts: the extraction of contours, the calculation of spatial gradient, the decision about defects, and the display of defects. Finally, the spatial gradient has a near-logarithmic relationship to the observability in judging the degree of how easily the detected defects are observed by the human inspector.

© 2008 SPIE and IS&T

Citation

Jee Hong Kim
"Human vision-based detection of nonuniform brightness on liquid crystal display panels", J. Electron. Imaging. 17(3), 033001 (August 28, 2008). ; http://dx.doi.org/10.1117/1.2952589


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.