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Terms Denitions
digital still camera (DSC)
A camera incorporating an image sensor which outputs a digital signal
representing a still picture, or records a digital signal representing a still picture
on a removable medium, such as a memory card or magnetic disk.
dynamic range cf. ISO DSC dynamic range, colour gamut, luminance ratio
Exif/JPEG
A compressed le format for digital cameras in which the images are
compressed using the baseline JPEG standard, described in ISO 12234-2,
and metadata and thumbnail images are stored using TIFF tags within an
application segment at the beginning of the JPEG le.
exposure index
A numerical value that is inversely proportional to the exposure provided to
an image sensor to obtain an image. Images obtained from a camera using a
range of exposure index values will normally provide a range of image quality
levels.
le system
The software structure which species how the data are logically organized on
a given storage medium.
folder
An optional sub-structure in a hierarchical storage area that can contain data
objects.
ISO speed
A numerical value calculated from the exposure provided at the focal plane of
an electronic camera to produce specied camera output signal characteristics
using the methods described in the referenced standard. The ISO speed
should correlate with the highest exposure index value that provides peak
image quality for normal scenes.
JPEG
Joint Photographic Experts Group. An image compression method dened in
ISO/IEC 10918-1.
memory card
A specic type of memory module with a physical form factor approximating
that of a credit card in outline; approx. 85 mm x 55 mm.
OSD On Screen Display
PC
Personal Computer. Any personal computing device, which may employ
various hardware architectures and operating systems.
protocol Dened mechanisms for exchanging data between devices.
StorageID
A device-specic four byte unsigned integer (UINT32) that represents a unique
storage area that may contain data objects. The most signicant sixteen bits
of a StorageID represents the PhysicalStorageID, while the least signicant
sixteen bits of a StorageID represents the LogicalStorageID.
USB
Universal serial bus, a digital interface for connecting up to 64 devices in a
tiered-star topology. See http://www.usb.org.
white balance
The adjustment of electronic still picture color channel gains or image
processing so that radiation with relative spectral power distribution equal to
that of the scene illumination source is rendered as a visual neutral.
Source: ISO/WE 12231 Photography-- Electronic still-picture cameras -- Terminology