Epson EMP-52 User Manual page 84

Glossary
Interlaced A method of image scanning whereby the image data is divided into
fine horizontal lines which are displayed in sequence starting from left
scanning
to right and then from the top to the bottom of the screen. The even-
numbered lines and odd-numbered lines are displayed alternately.
Progressive A method of image scanning whereby the image data from a single
image is scanned sequentially from top to bottom to create a single
scanning
image.
Refresh rate The light-emitting element of a display maintains the same luminosity
and colour for an extremely short time. Because of this, the image must
be scanned many times per second in order to refresh the light-emitting
element. The number of refresh operations per second is called the
"refresh rate", and is expressed in hertz (Hz).
Resize
This function is use to project computer images that have a resolution
or more than or less than the projector's panel resolution to be projected
display
so that they fill the whole of the projection area.
Security A device consisting of a projector case with a hole in it that a
commercially-available theft-prevention cable can be passed through in
lock
order to secure the device to a table or pillar. This projector is
compatible with the Microsaver Security System manufactured by
Kensington.
SDTV
An abbreviation for Standard Definition Television. It refers to standard
television systems which do not satisfy the conditions for High-
Definition Television.
sRGB An international standard for colour intervals that was formulated so
that colours which are reproduced by video equipment can be handled
easily by computer operating systems (OS) and the Internet.
SVGA
A type of video signal with a resolution of 800 (horizontal) x 600
(vertical) dots which is used by IBM PC/AT-compatible computers.
S-Video
A video signal which has the luminance component and colour
component separated in order to provide better image quality.
It refers to images which consist of two independent signals: Y
(luminance signal), and C (colour signal).
Sync.
The signals output from computers have a specific frequency. If the
projector frequency does not match this frequency, the resulting images
(Synchroni-
will not be of a good quality. The process of matching the phases of
sation)
these signals (the relative position of the crests and troughs in the
signal) is called "synchronisation". If the signals are not synchronized,
problems such as flickering, blurriness and horizontal interference can
occur.
Tracking
The signals output from computers have a specific frequency. If the
projector frequency does not match this frequency, the resulting images
will not be of a good quality. The process of matching the frequency of
these signals (the number of crests in the signal) is called "tracking". If
tracking is not carried out correctly, wide vertical stripes will appear in
the projected images.
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