Apparatus and method for recognizing image features using color

Details Apparatus and method for recognizing image features using color Apparatus and method for recognizing image features using color

1988-06-30

1991-02-05

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358 21R, 358 22, 358 31, 250226, G06K 900

Patent

active

049912232

ABSTRACT:
The invention is an apparatus and method for tracking colors in image features by using color elements. A scan signal representing a scanned imaage with colored features is converted into color element signals representing instantaneous magnitude values of predetermined color elements. These values are compared against predetermined color element magnitude value combinations representing expected colors of features in the image. If the instantaneous magnitude values match a predetermined color element value combination, the corresponding color is correlated with a picture element of the scanned image. More elaborately, image features are recognized by comparing the matched combination with the expected image feature locations. When a set of instantaneous values matching one of the expected color element combinations is correlated with an expected location, a determination is made whether the color element combination is one expected for the particular feature location. It is expected that each image feature will be substantially invariant chromatically. Thus, once the edge of a feature is detected by detection of a predetermined color element combination, the picture elements between that edge and the following edge of the feature are assumed to have the same value.

REFERENCES:
patent: 4430748 (1984-02-01), Tuhro et al.
patent: 4797738 (1989-01-01), Kashi et al.

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