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Proceedings Paper

A controllable anti-aliasing filter for digital film cameras
Author(s): Branko Petljanski
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Paper 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.

Paper Details

Date Published: 24 January 2012
PDF: 7 pages
Proc. SPIE 8299, Digital Photography VIII, 82990I (24 January 2012); doi: 10.1117/12.912175
Show Author Affiliations
Branko Petljanski, Panavision Inc. (United States)

Published in SPIE Proceedings Vol. 8299:
Digital Photography VIII
Sebastiano Battiato; Brian G. Rodricks; Nitin Sampat; Francisco H. Imai; Feng Xiao, Editor(s)

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