Contrast determining apparatus and methods

Details Contrast determining apparatus and methods Contrast determining apparatus and methods

G - Physics

06

K

G06K 7/10 (2006.01) G06T 7/00 (2006.01)

Patent

CA 2264861

Apparatus for determining the contrast of a mark, for example lettering on a cable, uses a CCD sensor or the like to capture a two-dimensional image of the Mark. The pixel values from the CCD are thresholded into populations of black, grey and white. The average intensities of the "black" and "white" pixels are taken and an indicator of contrast obtained from the following formula: contrast = (I max - I min)/ I max where I max = average "white" pixels, I min = average "black" pixels.

Appareil destiné à déterminer le contraste d'une marque telle qu'une inscription sur un câble et utilisant un capteur à dispositif à couplage de charges (CCD) (26) ou autre pour prendre une image bidimensionnelle de la marque. Les valeurs de pixels du CCD sont divisées par seuil en populations de noir, gris et blanc. Les intensités moyennes des pixels "noirs" et "blancs" sont relevées et un indicateur de contraste est obtenu à partir de la formule suivante contrast = (Imax - Imin)/Imax, dans laquelle Imax = moyenne des pixels "blancs" et Imin = moyenne des pixels "noirs".

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