InFocus Genesis P130 Manual De Instrucciones página 66

Glosario de términos
Term Description
Invert Image Invert image flips the image from top to bottom, to compensate for
ceiling mounting a projector upside down. Projectors typically ceiling-
mount upside down, because most have a built-in offset that allows
you to mount the screen at a comfortable height, yet still project an
image without tilting the projector and causing keystone distortion.
ISF Imaging Science Foundation. Organization that trains and accredits
display calibration technicians as well as certifies display hardware.
Designs standard testing and calibration procedures and tools.
Jaggy The stair-step or sawtooth effect seen on lines that are not horizontal or
vertical or the edge of objects in digital displays. Also known as aliasing.
Smoothing and antialiasing techniques can reduce the effect of aliasing.
Jitter Abrupt variations in signal amplitude or timing that cause
reproduction instability in audio, video and data. Usually caused
by bandwidth limitations or impedance termination issues that can
sometimes be caused by the cable and/or connections you are
using. Power supplies can also be a source of this problem.
JPEG Joint Photographic Experts Group. Name of association that created
the image file standard of the same name. A lossy compression scheme
for storing high quality, full-colour images. Also used as a video format
under the guise M-JPEG of which a variant is used for DV video.
Judder Apparent stutter of on-screen movement. Motion judder in film is
due to the fact that the 24 frame/second sampling rate is too slow
to resolve camera panning motion. Judder is also caused by 3:2
pulldown where movie frames are on screen for differing times due to
frame rate translations. Also occurs on PAL to NTSC conversions.
Kensington A security device found on projectors and other electronic equipment
Lock that allows the equipment to be secured by key or combination to
another object using a rubberized cable.
Keystone Keystoning occurs when the projector is not perpendicular to the
screen, thereby creating an image that is not rectangular.
Keystone Keystone correction makes a projected image rectangular. This can be
Correction accomplished by positioning the projector to be perpendicular to the
screen. Since this is not always possible, most projectors are equipped
with keystone correction that allows the image to be keystone corrected
(made rectangular) by adjusting optics, making mechanical adjustments,
or applying digital scaling to the image. Keystone correction can be one
or two dimensional and manual or automatic depending on the projector
and the manufacturer. Be aware that digital scaling will introduce some
artifacts that are more evident when viewing small text and less evident
in presentation type material or video.
Latency The time between a device being requested to do something and the
start of the device actually doing it. It's a measurement usually used
for LCDs where the shorter the latency the better. NSTC requires a
latency of no more than 16ms in order to update the screen in time
without leaving a ghost of the previous image.
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