Image forming apparatus with automatic density adjustment

Details Image forming apparatus with automatic density adjustment Image forming apparatus with automatic density adjustment

1995-12-11

1997-12-09

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

382168, G01N 2155, G03G 1306

Patent

active

056965958

ABSTRACT:
A histogram preparation circuit prepares a density histogram from image data sent from a scanner. A histogram clear discriminating section detects a white peak of the histogram and a black peak thereof, and compares density of the white peak and that of the black peak with a white side threshold value and a black side threshold value, respectively. When the density of the white peak is the white side rather than the white side threshold value or the density of the black peak is the black side rather than the black side threshold value, it is detected whether or not a sum of the frequencies around the density of the white or black peak is a predetermined value or more. When the sum of the frequencies is the predetermined value or more, a histogram value stored in a histogram preparation circuit is cleared. A histogram is prepared by use of only image data showing the document, so that a suitable automatic density adjustment can be executed.

REFERENCES:
patent: 5075788 (1991-12-01), Funada
patent: 5351313 (1994-09-01), Bessho et al.
patent: 5383032 (1995-01-01), Euguchi et al.
patent: 5467196 (1995-11-01), Fukushima et al.
patent: 5471319 (1995-11-01), Ogawa
patent: 5502776 (1996-03-01), Manabe
patent: 5585927 (1996-12-01), Fukui et al.

Affiliated with

Also associated with

Rating

Image forming apparatus with automatic density adjustment does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image forming apparatus with automatic density adjustment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming apparatus with automatic density adjustment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1611811