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Motion Studio
D
Dark Current
The charge accumulated by pixels while not exposed to light. Normally, this charge is
reduced or eliminated prior to capturing a picture.
Depth of Field
The distance between the nearest and farthest points that appears in acceptably sharp
focus in a photograph. Depth of field varies with lens aperture, focal length, and camerato-subject distance.
Diaphragm
An adjustable device inside the lens which is similar to the iris in the human eye, it’s
comprised of six or seven overlapping metal blades; continuously adjustable from "wide
open" to "stopped down"; controls the amount of light allowed to pass through the lens
and expose the sensor when a picture is taken. It also controls the amount of depth of
field the photograph will have. Openings are usually calibrated in f-numbers. The more
blades used will have a more natural and rounded spots.
Digitization
It’s the process of converting analog information into digital format.
Digital Camera
It’s an electronic device used to capture and store photographs electronically instead of
using photographic film like conventional cameras. Modern compact digital cameras are
typically multifunctional, with some devices capable of recording sound and/or video as
well as photographs.
Double Exposure
It’s a capability of CCD and CMOS cameras to acquire two images within a 100 ns
interval. The first camera exposure may be controlled while the second exposure doesn’t.
DLL (Dynamic Linking Library)
A dynamic link library (DLL) is a collection of small programs, any of which can be called
when needed by a larger program that is running in the computer. The small program that
lets the larger program communicate with a specific device such as a printer or scanner is
often packaged as a DLL program (usually referred to as a DLL file). The advantage of
DLL files is that, because they don't get loaded into RAM together with the main program,
space is saved in RAM.
Dynamic Range
It’s the ratio of the saturation level of the CCD to the readout noise of the CCD camera
system. Dynamic range is a measure of the ability of the camera to capture both bright
and dark features in a single image. In general, the higher the camera’s dynamic range,
the more information per pixel it can capture. It’s usually expressed in dB.
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Users Manual