Astrophysics (index)

Image Stabilization

(camera mechanism to compensate for movement)

Image Stabilization mechanisms are used in cameras including astronomical telescope cameras to keep pictures sharp despite movement. For hand cameras this consists of movement detectors controlling some mechanism that keeps the image recording stable. It may do this by moving the lens or the CCD, or by electronic means after the light has hit the CCD (Digital Image Stabilization).

Cameras in astronomical telescopes may use Digital Image Stabilization in the form of an Orthogonal Transfer CCD (OTCCD), a CCD designed to shift pixels in real time according to some control. This can be used to compensate for Atmospheric Aberration or even to deal with the motion of the Earth, e.g., for exposures of a few seconds. For larger image sensors, an array of OTCCDs may be used, interconnected so as to act as a single, larger OTCCD.