By Topic

A New Auto-focusing Method Based on the Center Blocking DCT

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

3 Author(s)
Quan Feng ; Nanjing Univ. of Posts & Telecommun., Nanjing ; Ke Han ; Xiu-chang Zhu

First, this paper analyses the imaging relations of the lens system and the properties of image clarity evaluation function under the condition where the object distances of many objects are different. Then, a center window method is employed to stand out the interesting objects. Finally, the image clarity evaluation function based on the center blocking DCT (discrete cosine transform / DCT) method is proposed for evaluating the image clarity in this paper. Experimental results indicate that the proposed method can effectively focus the images both under long-short-object-distance situation and under long-object-distance situation.

Published in:

Image and Graphics, 2007. ICIG 2007. Fourth International Conference on

Date of Conference:

22-24 Aug. 2007