Step-scan method to enlarge the field of view of focal plane array cameras by continuously rotating optical elements

Michael Assel; Jochen Barth

doi:10.1117/12.542257

30 August 2004 Step-scan method to enlarge the field of view of focal plane array cameras by continuously rotating optical elements

Michael Assel, Jochen Barth

Author Affiliations +

Proceedings Volume 5406, Infrared Technology and Applications XXX; (2004) https://doi.org/10.1117/12.542257
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

In many applications of camera systems such as for surveillance a combination of a large field-of-view (FOV) with a high spatial resolution is desirable. Classical focal plane array (FPA) cameras can only fulfill this requirements with a very large number of pixels. We present a novel method to enlarge the FOV of a camera equipped with an FPA keeping the spatial resolution of the system untouched. Four images taken at different directions of the line of sight (LOS) are stitched together to a large image resulting in a significantly enlarged FOV in both directions. For this purpose two continuously rotating scan elements are placed in front of the optics which move the LOS with a highly non-uniform scan velocity. Image exposure is triggered when the scan velocity is almost zero. The influence of the residual LOS-movement to the image blur is controllable by various parameters of the system. We present the results of the simulation for an enlarged FOV with 584 x 488 pixels obtained with a scanned infrared FPA of 384 x 288 pixels working in the 3-5μm regime. The resulting system modulation transfer function (MTF) is calculated and the correlation of system performance parameters with the design parameters of the scanner is discussed.

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Michael Assel and Jochen Barth "Step-scan method to enlarge the field of view of focal plane array cameras by continuously rotating optical elements", Proc. SPIE 5406, Infrared Technology and Applications XXX, (30 August 2004); https://doi.org/10.1117/12.542257

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