A controllable anti-aliasing filter for digital film cameras

Branko Petljanski

doi:10.1117/12.912175

24 January 2012 A controllable anti-aliasing filter for digital film cameras

Branko Petljanski

Proceedings Volume 8299, Digital Photography VIII; 82990I (2012) https://doi.org/10.1117/12.912175
Event: IS&T/SPIE Electronic Imaging, 2012, Burlingame, California, United States

Abstract

In this paper, the theoretical foundation and practical implementation of a controllable anti-aliasing filter for digital film cameras is presented. A prototype of an optical anti-aliasing filter that is based on moving a parallel optical window was designed and built to demonstrate the ability to control the spatial frequency response of an acquisition system. During the image exposure, four spring-preloaded voice coils rapidly change the pitch and yaw of the parallel window, resulting in a displacement of the image content that is projected onto the sensor. The image content displacement during the exposure results in altering the frequency response of the scene that is captured by the sensor. Specifically, during the exposure time, a carefully controlled movement of the parallel optical window results in a circular trajectory of the image content that is projected onto the sensor. By increasing or decreasing the radius of the circular trajectory, the spatial cut-off frequency of the system is dynamically modified. In addition to the circular path, this paper shows theoretical justification and demonstrates the use of more complex trajectories, such as double circular, elliptical, and one-dimensional rectangular trajectories. These trajectories improve the suppression of aliased components in the acquired image.

Citation Download Citation

Branko Petljanski "A controllable anti-aliasing filter for digital film cameras", Proc. SPIE 8299, Digital Photography VIII, 82990I (24 January 2012); https://doi.org/10.1117/12.912175

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

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: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Optical filters

Cameras

Digital filtering

Image filtering

Sensors

Modulation transfer functions

Image sensors

Show All Keywords

Keywords/Phrases

Search In:

Publication Years