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Proceedings Paper

Algorithms For Determination Of Dark Current Map And Responsivity Characteristics For Video Cameras
Author(s): Barbara Johnston; James W. Worley Jr.
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Paper Abstract

The algorithms discussed in this paper combine to provide a straightforward approach to determine camera characteristics that can affect video images. These algorithms are simple to perform and have a sound statistical basis for interpreting the results. These were developed specifically while working with holographic images where it is important to know how the camera itself affects the image. There are two characteristics of a video camera that directly affect the output image. The dark current is the "image" that is seen when no light is striking the camera. This map can depend on camera temperature, so it is useful to be able to gauge this map as the camera temperature changes. The second characteristic is the camera responsiveness to light, ranging from minimal to saturation. This responsiveness may or may not be linear with respect to light levels or be uniform across the face of the camera. The methods described in this paper discuss a laboratory situation in which the dark current and responsivity were needed to be determined. A method was used to determine an estimate of the dark current map and gain a general idea of the camera's illumination response. Confidence intervals for these estimates may be assigned. These intervals give the user a feel for how accurate these estimates are. By subtracting the dark current and adjusting the image with the responsivity map, the user will be able to gain a truer image with the additive effects of the camera.

Paper Details

Date Published: 18 January 1988
PDF: 4 pages
Proc. SPIE 0829, Applications of Digital Image Processing X, (18 January 1988); doi: 10.1117/12.942144
Show Author Affiliations
Barbara Johnston, Rockwell International (United States)
James W. Worley Jr., Air Force Weapons Laboratory (United States)

Published in SPIE Proceedings Vol. 0829:
Applications of Digital Image Processing X
Andrew G. Tescher, Editor(s)

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