Instruction manual

Glossary
PIKE Technical Manual V3.1.0
260
Interline transfer CCD Interline transfer CCD or just interline CCD is a type of CCD in which the
parallel register is subdivided so that, like a Venetian blind, opaque strips
span and mask the columns of pixels. The masks act as storage areas. When
the CCD is exposed to light, the image accumulates in the exposed areas
(photosites) of the parallel register. In the serial register, the entire image
is under the interline mask when it shifts for CCD readout. It is possible to
shift the integrated charge quickly (200 ns) under the storage areas. Since
these devices function as a fast shutter (or gate), they are also sometimes
referred to as gated interline CCDs.
See microlens
IR IR = infrared
IR cut filter As color cameras can see infrared radiation as well as visible light, these
cameras are usually equipped with an IR cut filter, to prevent distortion of
the colors the human eye can see. To use the camera in very dark locations
or at night, this filter can be removed, to allow infrared radiation to hit
the image sensor and thus produce images.
Isochronous
transmission mode
Isochronous transmission mode is a mode supported by IEEE 1394
(FireWire). IEEE 1394 supports a guaranteed data path bandwidth and
allows for real-time transmission of data to/from 1394 devices. Isochro-
nous data transfers operate in a broadcast manner, where one or many
1394 devices can listen to the data being transmitted. The emphasis of
isochronous data transfers is placed on guaranteed data timing rather
than guaranteed delivery. Multiple channels (up to 16) of isochronous
data can be transferred simultaneously on the 1394 bus. Since isochro-
nous transfers can only take up a maximum of 80 percent of the 1394 bus
bandwidth, there is enough bandwidth left over for additional asynchro-
nous transfers.
(See also Asynchronous transmission mode).
Jitter Small, rapid variations in a waveform due to mechanical disturbances or to
changes in the characteristic of components. They are caused by variations
in supply voltages, imperfect synchronizing signals, circuits, etc.