Product guide

ManualsBrandsViewSonic ManualsSoftwareCDE3201LED

Horizontal Lens Shift The purpose of Lens Shift is to

eliminate keystoning and provide greater exibility in the

placement of the projector relative to the screen. Lens shift

may be a manual adjustment or motorized. Horizontal lens

shift typically allows the projector to be placed anywhere

between right and left edge of the projection screen and

may also be used to geometrically align images when

stacking projectors. Vertical lens shift is also available on

some projectors.

Horizontal Resolution The ability of a system to re-

produce closely spaced alternating black and white vertical

lines of detail across the screen. The number of alternating

black and white lines is divided by the aspect ratio to make

comparisons between horizontal and vertical resolution

easier. This number is usually expressed as TV lines per

picture height. (See Aspect Ratio)

Horizontal Scan Rate A gure that describes the

speed of the electron beam that creates the scan lines of

a video or computer display. The horizontal scan rate for

standard NTSC/PAL video is approximately 15 kHz. For

VGA displays and above, scan rates of 31.5 kHz or more

are used.

Hospitality A large vertical market which includes hotels,

resorts, restaurants and casinos.

Hot Spot The part of a displayed image which is unevenly

illuminated, usually a bright area in the center. An unwanted

effect especially with whiteboards.

HTML (Hypertext Markup Language) HTML is the lan-

guage used to create Web pages for display in Web Brows-

ers. HTML can be created directly with text editors or Web

publishing programs, such as Dream Weaver, or it can be

the output of other programs that make dynamic webpages

on the y. When you select “view source” from your Web

browser, the code that you are viewing is HTML.

HTTP (Hypertext Transfer Protocol). The internet protocol

used to deliver information over the web.

Hue The parameter of color that allows us to distinguish

between colors.

Image Processing Enhancing and

manipulating an image, such as by adjusting its

size, resolution, or color palette.

Infra-Red Remote (IR) remote control transmits in the

spectrum of infra-red light, such as a television remote.

Unlike RF remotes, IR remotes must point at the receiver

(line of sight) or reect the IR from the screen to the receiver.

Typical range is limited to 30 feet including the distance

to and from reected surfaces. For example, if you are

controlling a projector and you point the remote at the

screen which is 12 feet from you and the projector is 10 feet

from the screen, then the total distance is 22 feet. Unlike

RF remotes, IR remotes must have a clear path or a clear

reected path to the IR receiver to operate. Most projectors

have an IR sensor in both the front and rear of the projector,

whereas, at-panels generally have a single IR sensor in the

front of the unit. When working at or near the maximum dis-

tance, pointing right at the receiver will give better results.

Interactive Projector Interactive projectors became

popular in 2010 and come in many variations. This

technology encompasses any solution that enables active

participation by the user with the projected content, rather

than just the passive viewing of content. Typically, the

presenter is allowed to interact with either the projected im-

age, the projector, or in some cases another device, using

either an electronic pen, a mechanical pen or even a nger.

These Interactive Projectors essentially create an electronic

whiteboard on any surface where the image is projected

allowing the presenter to interact with the projected image

using a stylus that may be electronic or mechanical. Some

interactive projectors allow user generated information to be

captured and replayed, printed, or copied with or without

the original projected image.

Interlace A process used to refresh video displays and

some computer displays that alternately scans every other

horizontal scan line in the display. Interlaced displays often

icker, especially when showing static images containing

narrow horizontal lines.

Interlace A technique of improving the picture quality of

a video signal without consuming extra bandwidth. Inter-

laced video was designed for display on CRT televisions.

Interlaced A process where a video image is delivered in

two elds each containing half the video image rather than

a single frame that contains the entire image. The rst eld

contains all the odd lines and the second eld contains all

the even lines. For example, each 480i frame is made up of

two elds of 263 and 262 lines of resolution and updated

at 60Hz. 480 denotes the active picture area; however, the

total frame size is actually 525 lines. 480i and 1080i are in-

terlaced signals whereas 720p is a progressive signal where

each video image is delivered in a single frame. Interlaced

video was introduced with the rst televisions because of

bandwidth limitations.

International Power Supply A unit that can operate

under a international selection of power requirements. The

specs of units vary widely, but the minimum is 105-230

volts, and 50-60 cycles AC (alternating current). If you see

a specication like 110v, 220v instead of a range, those

ratings are usually +/- a given percent such as 10%. Most

units are “self-switching” they will automatically switch to

whatever power source you plug it into. Others will have

to be switched (internally or externally to accommodate a

difference voltage or cycle range.

Internet Protocol (IP) These protocols are used to

communicate across interconnected networks and can

be used for common applications such as e-mail, terminal

emulation and le transfer.

Intranet An internal computer communications network.

Invert Image Invert image ips the image from top to

bottom, to compensate for ceiling mounting a projector up-

side 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

certies display hardware. Designs standard testing and

calibration procedures and tools. International organization

within which governments and the private sector coordinate

global telecom networks and services.

Jaggy The stair-step or saw-tooth effect seen on

lines that are not horizontal or vertical or the edge

of objects in digital displays. Also known as

aliasing. Smoothing and anti-aliasing 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 ter-

mination 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.

Judder Apparent stutter of on-screen movement. Motion

judder in lm is due to the fact that the 24 frame/second

sampling rate is too slow to resolve camera panning mo-

tion. Judder is also caused by 3:2 pull-down where movie

frames are on screen for differing times due to frame rate

translations. Also occurs on PAL to NTSC conversions.

Kelvin A temperature measurement scale where

0° Kelvin (0° K) is equal to absolute zero, the

temperature at which all molecular movement

ceases. One degree of Kelvin is equal to 1 degree of

Celsius. The color temperature of large image devices is

measured in Kelvin. The higher the temperature, the bluer

the light.

Kensington Lock A security device found on projectors

and other electronic equipment that allows the equipment

to be secured by key or combination to another object us-

ing a rubberized cable.

Kerning An adjustment of the normal space between

certain combinations of characters, to eliminate excess

space.

Key Frame A video frame that contains all the data

required to produce an image without any reference to the

previous frames.

Keystone Correction Makes a projected image

rectangular. This can be 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.

LAN (Local Area Network) A network of

computers sharing a single server or servers in a

single location, typically in an ofce or building.