Color normalization process

Details Color normalization process Color normalization process

1990-07-18

1992-02-18

Lall, Parshotam S.

Boots, shoes, and leggings

356402, G01J 350

Patent

active

050899767

ABSTRACT:
A scientifically explained color normalization process for producing image and information arrays which correspond to human color perception and description and are substantially invariant under varying conditions of illumination intensity and measurements geometry. New radiation measurements obtained by a three waveband sensor (10) are normalized by a computer or equivalent device using an individual waveband normalization algorithm (12) which divides each measurement by the mean of about ten thousand surrounding measurements, thus extracting the maximum resolution relational reflectance factor. The combined three waveband normalized array is presented as a color-coded alphanumeric array in terms of MUNSELL hue, value and chroma, using a cylindrical coordinate transformation algorithm (14) and a MUNSELL conversion algorithm (16). The normalized array is also presented using a balanced image display device (18), based on either additive or subtractive primaries.

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