Histogram operating unit for video signals

Details Histogram operating unit for video signals Histogram operating unit for video signals

1998-03-04

2000-03-14

Chang, Jon

Image analysis

Histogram processing

348672, G06T 540

Patent

active

060383410

ABSTRACT:
A histogram operating unit comprises: histogram generator which receives input video signals, and creates a histogram of input video signals, a first limiter for receiving a histogram generated by the histogram generator and an externally set first limit level, and restricting the frequency of the histogram created by the histogram generator to within a specified level, and outputting a restricted histogram, a first totaling circuit for calculating the number of samples of video signals produced by the first limiter, second totaling circuit for calculating the number of samples of the input video signals, a first subtractor for subtracting the output of the first totaling circuit from the output of the second totaling circuit, and a corrected histogram generator which receives the output of the first limiter and the output of the first subtractor, and creates the corrected histogram.

REFERENCES:
patent: 5263098 (1993-11-01), Horikami
patent: 5289282 (1994-02-01), Tsuji et al.
patent: 5315389 (1994-05-01), Izawa et al.
patent: 5394194 (1995-02-01), Izawa et al.
patent: 5471319 (1995-11-01), Ogawa

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