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Blooming suppression in charge coupled area imaging devices

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An intense spot of light projected onto the photo-sensitive surface of an imaging device can cause this device to saturate locally. Excess carriers generated by the light source can diffuse into the neighboring area which may also be driven into saturation. In the display the light source will then appear as a white area that can be considerably larger than its image in the true geometrical proportions. This effect, known as blooming, is present in most TV camera tubes, and demands special care by the operator to avoid bright objects in the scene being imaged. For the Picturephone® camera, which often has to operate in less than ideal conditions, the design of a camera with limited blooming is thus more than desirable.

Published in:

Bell System Technical Journal, The  (Volume:51 ,  Issue: 8 )