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

Author Affiliations +

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.

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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

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KEYWORDS

Optical filters

Cameras

Digital filtering

Image filtering

Sensors

Modulation transfer functions

Image sensors

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