(Machine Vision Equipment)
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Some sensors, including the Kodak KAF series, offer an optional anti-blooming gate designed to bleed off overflow from a saturated pixel. Without this feature, a bright star which has saturated the... (View Full Article)
(Video Cameras and Accessories)
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The following data sheet is typical of that prepared by Apogee Imaging Systems for each of its imaging cameras. Some of the measurements here are done by design, and some are performed on each camera... (View Full Article)
(Machine Vision Equipment)
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This is a CCD sensor level specification which describes the efficiency of charge transfer. The image from a CCD is read out by transfer of rows into a horizontal register, followed by transfer of... (View Full Article)
(Machine Vision Equipment)
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Virtually all serious imaging systems employ this technique in various manners. Before the charge of each pixel is transferred to the output node of the CCD, the output node is reset to a reference... (View Full Article)
(Machine Vision Equipment)
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Next to the quantum efficiency, resolution (number of bits) and noise figure, this is perhaps the most important CCD specification. Dark count refers to that property of all CCD sensors to generate... (View Full Article)
(Machine Vision Equipment)
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Manufacturers will describe their system speed with this type of specification. There is no clear standard for how speed is specified and its use varies with each manufacturer. For example, a transfer... (View Full Article)
(Machine Vision Equipment)
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Digitization, also referred to as analog to digital conversion, is the process by which charge from the CCD is translated into a binary form used by the computer. The term binary refers to the base 2... (View Full Article)
(Machine Vision Equipment)
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The dynamic range is often represented as a log ratio of well depth to the readout noise in decibels. For example, a system with a well depth of 85,000 electrons and a readout noise of 12 electrons... (View Full Article)
(Machine Vision Equipment)
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The mechanism by which charge transfer from a CCD is performed lends itself to on-chip pixel binning. To quickly review charge transfer in a CCD, the following diagram is shown. As light (photons)... (View Full Article)
(Machine Vision Equipment)
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The quantum efficiency (Q.E.) of a sensor describes its response to different wavelengths of light (see chart). Standard front-illuminated sensors, for example, are more sensitive to green, red, and... (View Full Article)
(Machine Vision Equipment)
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Readout noise is specified both for the CCD sensor and the total system. Noise can be thought of in two ways. First, there is not perfect repeatability each time charge is dumped out of the CCD and... (View Full Article)
(Machine Vision Equipment)
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System gain, also known as inverse system gain, is a way of expressing how many electrons of charge are represented by each count (ADU). A gain of 2.5 electrons/ADU indicates that each count or gray... (View Full Article)
(Video Cameras and Accessories)
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These questions illustrate the three major issues of matching a telescope to a CCD camera: 1) sampling, 2) pixel sensitivity, and 3) field of view. These issues must be addressed in order to take CCD... (View Full Article)