JAMES LINDSAY, MD
Medical Practice at Gantenbein Ave, Portland, OR

4754329, Jun 28, 1988

Apr 13, 1987

7/037500

James W. Lindsay - Vancouver WA
Geoffrey B. Rhoads - Yacolt WA

Tektronix, Inc. - Beaverton OR

H04N 718, H04N 1704

358139

A method of focusing and calibrating a display screen which is coupled to a video camera where the display screen is not visible when performing the calibration. The method includes the steps of generating a reference signal to display an image on the display screen, capturing an image of the display signal in the video camera and converting the image into digital signals representing the brightness of pixels in a pixel matrix, analyzing the digital signals for data representing predetermined physical parameters of the visual display on the screen, and generating on a separate display screen a graphic representation of these physical parameters. By observing the bar graphs on a microcomputer at the same time that adjustments are made to the focus, intensity, and rotation controls on the oscilloscope, the display screen may be focused and calibrated.

4750210, Jun 7, 1988

Dec 16, 1986

6/943279

James W. Lindsay - Vancouver WA
Gail W. Marshall - Beaverton OR

Tektronix, Inc. - Beaverton OR

G06K 938

382 53

A signal processing circuit for enabling a computer to quickly scan a memory having stored signals which represent a video image includes a flag generator responsive to a lit pixel detector for providing a flag signal to the memory to be stored in an address location indicating the presence of at least one lit pixel in that row. Incoming video, which includes data and sync signals, is digitized and examined by the lit pixel detector and a flag signal is clocked into memory at a predetermined address. The computer scans these address locations, which lie in a single column, to determine the identity of rows having a flag signal. This eliminates the need for the computer to scan the entire address space to locate an object of interest.