Method and apparatus for determining a scanning track for a narr

Details Method and apparatus for determining a scanning track for a narr Method and apparatus for determining a scanning track for a narr

1991-12-24

2000-08-08

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356402, 356425, G01B 1100, G01J 350

Patent

active

061009822

ABSTRACT:
The present method includes moving a light reading head along the length of a color bar whose length lies in an X direction and simultaneously therewith moving said light reading head in a Y direction, where the Y direction is substantially orthogonal to said X direction. The method further involves keeping an account of the positions of said light reading head and noting, as a benchmark position, each time the light reading head passes in the Y direction from a position off the color bar to a position over the color bar. The method further involves computing a desired Y value for each of said benchmarks and a plurality of interpolated Y values linking adjacent desired Y values to form a track which (in a preferred embodiment) lies substantially along the middle of the color bar over which to guide said light reading head during a subsequent scan. The apparatus comprises a light reading head, with an aperture that projects a light spot which has a diameter of 1/2 mm, in a preferred embodiment. The light reading head is held by a device which moves the head in both the X and Y directions, simultaneously, and transmits signals to a computing device to compute the above mentioned desired Y values and the interpolated values lying between adjacent desired Y values.

REFERENCES:
patent: 4289405 (1981-09-01), Tobias
patent: 4505589 (1985-03-01), Ott et al.

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