Method and apparatus for testing and checking the criteria of a

Details Method and apparatus for testing and checking the criteria of a Method and apparatus for testing and checking the criteria of a

1988-02-11

1990-08-14

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 22, 358 28, H04N 968, H04N 974, H04N 1702

Patent

active

049491652

ABSTRACT:
A test pattern generator provides a test pattern signal timed for insertion in the foreground signal of a chromakey mixer to occupy the area of particular shape in any desired part of a monitor screen. The test pattern signal provides a color scan signal which becomes part of the foreground signal within the test pattern area and which is also supplied to the decoder along with the foreground signal. Decoder responds to the color scan signal in the test pattern by substituting the background signal of the portion of the color scan displayed corresponding to colors to which the decoder responds by switching in the background signal. This enables determination of the exact range of response of the decoder while the mixer is operating also of observance of changing of the setting of the response of the decoder so that it can be more accurately set to the desired color range.

REFERENCES:
patent: 3958269 (1976-05-01), Davis
patent: 4101928 (1978-07-01), Sato
patent: 4149178 (1979-04-01), Estes
patent: 4214258 (1980-07-01), Van der Valk
patent: 4513318 (1985-04-01), Wilensky
patent: 4694344 (1987-09-01), Flora
patent: 4710800 (1987-12-01), Fearing
Test Methods for Digital HDTV Video Switching, by R. Riemann, The Institution of Electronic and Radio Engineers-Third International Conference on Television Measurements, Publication No. 74, Jun. 20, 1987.

Affiliated with

Also associated with

Rating

Method and apparatus for testing and checking the criteria of a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for testing and checking the criteria of a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for testing and checking the criteria of a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-466646