Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

A CMOS Active Pixel Sensor With Light Intensity Filtering Characteristics for Image Thresholding Application

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Chia-Chin Huang ; Inst. of Electron. Eng., Nat. Tsing-Hua Univ., Hsinchu, Taiwan ; Huang, J.K.-T. ; Chi-Wei Lee ; Chrong Jung Lin

A CMOS image sensor with light intensity filtering feature for realizing image thresholding is proposed. The simple sensing pixel circuit with less than 5 transistors is designed to provide a tunable non-linear photo-response with a peak signal at a specified intensity level. This unique intensity-filtering photo-response characteristic is achieved by the push/pull forces between the n+/p photo-diode and a parasitic p+/n-well diode on the PMOS control transistor. With proper timing control, tunable intensity filtering transfer functions can be obtained on the unique pixel. Based on the behavior model of the pixel's photo-response, image thresholding as well as edge detection are successfully demonstrated by this non-linear imager.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 5 )