Regular Articles

Adaptive image acquisition by autodefocusing

[+] Author Affiliations
Tao Ma

Auburn University, Department of Electrical and Computer Engineering, 200 Broun Hall, Auburn, Alabama 36849

Stanley J. Reeves

Auburn University, Department of Electrical and Computer Engineering, 200 Broun Hall, Auburn, Alabama 36849

J. Electron. Imaging. 20(3), 033013 (September 01, 2011). doi:10.1117/1.3624489
History: Received March 18, 2011; Revised June 17, 2011; Accepted July 15, 2011; Published September 01, 2011; Online September 01, 2011
Text Size: A A A

We present an adaptive image-acquisition methodology by replacing the traditional birefringent filter with slight out-of-focus blur generated by the camera lens. Because many cameras already have adjustable lenses and autofocus systems, our method can exploit existing hardware by simply changing the focusing strategy. During the image acquisition, the optimal defocus setting is automatically adapted to the power spectrum of the scene, which is evaluated by a generic autocorrelation model. We develop a criterion to estimate reconstruction errors without the baseband knowledge of the scene. This metric helps the camera to choose the optimal defocus settings. An optimal Wiener filter then recovers the captured scene and yields sharper images with reduced aliasing. The numerical and visual results show that our method is superior to current acquisition methods used by most digital cameras.

Figures in this Article
© 2011 SPIE and IS&T

Citation

Tao Ma and Stanley J. Reeves
"Adaptive image acquisition by autodefocusing", J. Electron. Imaging. 20(3), 033013 (September 01, 2011). ; http://dx.doi.org/10.1117/1.3624489


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.