Apparatus and method for determining a dimension of an object

Details Apparatus and method for determining a dimension of an object Apparatus and method for determining a dimension of an object

1989-06-28

1990-05-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, 356376, 358107, G01N 2186, G01B 1124, H04N 718

Patent

active

049298437

ABSTRACT:
The height of an object is determined by projecting a beam of light there across to form a light stripe. A camera views the object obliquely, and forms an image of the light stripe. As a result of the oblique view, the light stripe is imaged as a series of bright vertical lines on a horizontally-scanned image. Each horizontal line scan crosses the light stripe at a particular horizontal position, representative of the height of the object at that point on the image. The projection and imaging optics cause the light stripe to be several pixels wide, so that the height is not exactly known. A logic circuit finds the pixel with the greatest intensity and stores its position and value, and the values of its neighboring pixels. At the end of each line scan, the sum of the stored intensities is formed, together with a weighted sum, so that a ratio may be formed which represents the center position.

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