Image processing method and apparatus using a truncated histogra

Details Image processing method and apparatus using a truncated histogra Image processing method and apparatus using a truncated histogra

1995-05-09

2000-01-25

Couso, Yon J.

Image analysis

Histogram processing

382167, 382274, G06K 900

Patent

active

060185899

ABSTRACT:
The gradation data is found from image signals for one screen, which are obtained when an image is picked up, and a histogram is made by counting all the gradation data for one screen in every gradation, with a predetermined frequency as an upper limit. Then, a reference minimum value of the image signals is calculated by detecting a point where a cumulative frequency which is counted from a small gradation of the histogram reaches a predetermined rate for total number of the gradation data, and a reference maximum value of the image signals is calculated by detecting a point where a cumulative frequency which is counted from a large gradation of the histogram reaches a predetermined rate. The image processing is carried out in accordance with the calculated reference minimum value and reference maximum value.

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