Browse Prior Art Database

Color Scanning System

IP.com Disclosure Number: IPCOM000077307D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Methuen, RA: AUTHOR

Abstract

The system shown in the figure scans the surface of an article and determines the color distribution over the surface.

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Color Scanning System

The system shown in the figure scans the surface of an article and determines the color distribution over the surface.

This system, although useful for determining color distribution over any surface, has been particularly designed to determine the various colors over the surface of a turbine blade which has been run after being coated with a temperature sensitive paint. Once the color distribution has been established, a simple conversion from color to temperature gives the maximum temperature reached by various parts of the blade during the run.

The surface of the subject 1, in this case the turbine blade, is scanned by a television camera 2 using normal 625 lines, 50 fields interlace scanning. A monitor display 3 enables the camera and lighting to be adjusted to achieve optimum results. The video output from the camera consists of three analogue signals representing the instantaneous color of that part of the subject under view. In this system, there is no combination of the red, green and blue signals as in transmitted color television for domestic viewing. By use of a standard chromaticity diagram it can be shown that any color may be defined by the expressions: Ax = 0.67xr + 0.21xg + 0.14xb over r + g + b Ay = 0.33xr + 0.71xg +
0.09xb over r + g + b. where r, g and b are the instantaneous values of the respective color analogue signals.

The three analogue signals representing the instantaneous color of the part of the blade under view...