Image processing method for distinguishing object by determining

Details Image processing method for distinguishing object by determining Image processing method for distinguishing object by determining

1990-11-14

1992-08-11

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 51, 358466, G06K 938, G06K 900

Patent

active

051386712

ABSTRACT:
An image processing method distinguishes an object from within an image area by determining a stable threshold value of light intensity values from within the image area. Received light is converted into image data denoting light intensity values of the received light at a plurality of points from within the image area. A bright portion average value denoting an average of the light intensity values which exceed a predetermined threshold and a dark portion average value denoting an average of the light intensity values which are less than the predetermined threshold are calculated. A new threshold is obtained by applying the bright portion average value and the dark portion average value to a predetermined dividing ratio. The object within the image area is distinguished using the new threshold. The method is also applicable to the use of multivalue thresholds.

REFERENCES:
patent: 4868884 (1989-09-01), Miyezaki et al.
patent: 4998122 (1991-03-01), Kanno et al.

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