Dynamic focus window selection strategy for digital cameras

Yibin Tian; Huajun Feng; Zhihai Xu; Jianqi Huang

doi:10.1117/12.586482

Abstract

The purpose of selecting focus window is not only to reduce computation, but also to improve image sharpness of object(s) of interest. A simple geometrical model is built using thin lens Gauss equation. The necessity of utilizing different focus window selecting strategies is demonstrated with the model. Then a dynamic focus window selecting method is described. It's reasonable to assume that a photographer's gaze direction points to the object(s) of his interest when he is taking a picture. The gaze direction is trackable by various pupil-tracking methods. A simple modification of viewfinder allows us to take images of photographer's eye with the built-in image sensor. The images are then processed to determine the photographer's gaze direction. One small area in the target image is matched to the gaze direction and selected as focus window. Within the focus window, an uneven sampling method can be used to reduce the computational need further. The uneven sampling works the same way as the human retina. This dynamic focus window selecting method can greatly increase the probability of getting sharply focused object(s) of interest, at the same time only less than 1% of the target image is needed to apply the focus measure.

Citation Download Citation

Yibin Tian, Yibin Tian, Huajun Feng, Huajun Feng, Zhihai Xu, Zhihai Xu, Jianqi Huang, Jianqi Huang, "Dynamic focus window selection strategy for digital cameras", Proc. SPIE 5678, Digital Photography, (23 February 2005); doi: 10.1117/12.586482; https://doi.org/10.1117/12.586482

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

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

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years