文档介绍：Source: Standard Handbook of Video and Television Engineering
Section
1
Light, Vision, and Photometry
The world’s first digital puter was built using 18,000 vacuum tubes. It occupied an
entire room, required 140 kW of ac power, weighed 50 tons, and cost about $1 million. Today, an
puter can be built within a single piece of silicon about the size of a child’s fingernail.
And you can buy one at the local parts house for less than $10.
Within our lifetime, the progress of technology has produced dramatic changes in our lives
and respective industries. Impressive as the current generation puter-based video equip-
ment is, we have seen only the beginning. New technologies promise to radically alter -
munications business as we know it. Video imaging is a key element in this revolution.
The video equipment industry is dynamic, as technical advancements are driven by an ever-
increasing professional and customer demand. Two areas of intense interest include high-resolu-
puter graphics and high-definition television. In fact, the two have e tightly inter-
twined.
Consumers worldwide have demonstrated an insatiable appetite for new electronic tools. The
puter has redefined the office environment, and HDTV promises to redefine home
entertainment. Furthermore, the needs of industry and national defense for innovation in video
capture, storage, and display system design have grown enormously. Technical advances are
absorbed as quickly as they roll off the production lines.
This increasing pace of development represents a significant challenge to a-
nizations around the world. Nearly every element of the electronics industry has standardization
horror-stories in which the introduction of products with patible interfaces forged ahead of
standardization efforts. The end result is often needless expense for the end-user, and the poten-
tial for slower implementation of a new technology. No one wants to purchase a piece of equip-