Runco REFLECTION CL-510 Manual de usuario descargar pdf (Pagina 18)

TECH CORNER

18 ExtroNews 14.3 Fall 2003

Unless, perhaps, you have a scaler that

can “Auto-Image.” The Auto-Image feature

available on Extron’s newest scalers and scan

converters was designed to minimize the

work in calibrating many scaler adjustments.

After all, why adjust something manually that

can be set automatically? But new features

always bring new questions. What is Auto-

Image? How much can it do? Where and

when should it be used?

This article will answer those questions

and more by discussing the four settings

affected by Auto-Image: size, position, clock,

and phase. It will deﬁne them and how they

should be set to achieve maximum image

quality. Then, we’ll cover the “Auto-Image”

feature, how it works, and its advantages

and limitations.

If you’re experienced in calibrating digital

displays, you’ll ﬁnd many of the concepts

familiar. See the sidebar on projector setup

(page 22) to clarify the similarities.

Size and Position

Left-right, up-down, bigger-smaller. The idea

is to ﬁll the whole screen with the image in

the right place. The adjustments seem simple

enough, they are intuitively obvious, and

anyone can see and understand their effects.

But does everyone comprehend what must

happen to a video signal to change where,

and how large, an image is?

To demonstrate

how

a scaler adjusts an

image’s size or position,

let us consider an ex-

ample of how a scaler

works. Figure 1 shows

a typical scaler

application with a DVD

player, an Extron ISS 408,

and an LCD projector.

The scaler’s job is to

take the NTSC signal

in and deliver the

signal that the projector

works best with, in

this case 1024 x 768,

RGBHV. Figure 2

demonstrates what

happens at the signal

level, line by line.

A standard NTSC

signal in the Y, Pr, Pb

format is input to the

scaler. To capture the incoming information,

the scaler samples active video and stores the

active video information digitally.

Next, the scaler must scale the line of

digital video information captured into a

line of digital video information consistent

with the output format. The line of digitized

information must be reclocked with the

correct number of pixels, in this case 1024.

Those pixels must be clocked evenly

throughout the active horizontal time

envelope of the output resolution.

Once lines of active video are horizontally

reclocked to their new format, they are math-

ematically processed to create new frames of

video with the correct number of lines, 768 in

this example, for the output format. This

number of lines will be clocked out evenly

by Ian Foresman, Applications Technology Manager

Optimizing Your Image with Auto-Image

™

Setting up a scaler for optimum size, position, clock, and phase adjustments

he art or science of calibrating and adjusting video equipment has changed over the years. The number of

items to calibrate has grown from settings such as brightness and tint to adjustments including aspect

ratio, sizing, and pixel phase as sources, displays, and signal processing equipment have increased in variety

and complexity. Scalers, or devices that take in a video image at one resolution and output the same image

at another resolution, add to the settings that a video professional must adjust when calibrating a video system

for optimum image quality.

Projector

Extron

ISS 408

Integration

Seamless Switcher

50/60 Hz

1.2A MAX.

H/HV

INPUTS

H/HV

PROGRAM

OUTPUTS

PRO

PREVIE

RS-232

H/HV

PREVIEW

H/HV

ETHERNET

LINK

DVD

Computer

Extron

RGB 109xi

Interface

Figure 1: A typical scaler application.

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