Method of and arrangement for determining the sharpness of origi

Details Method of and arrangement for determining the sharpness of origi Method of and arrangement for determining the sharpness of origi

1985-02-28

1987-03-10

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358284, 355 41, G03F 308

Patent

active

046494227

ABSTRACT:
An original to be reproduced is scanned line-by-line, and a scanning signal is generated for each linear, scanned region. The scanning signals represent the densities of the respective regions. A portion of each scanning signal is filtered to remove the higher frequencies. The filtered signal is differentiated to yield first density gradients, and the extreme positive and negative values of the first density gradients are determined for each region. Another portion of each scanning signal is differentiated without first removing the higher frequencies thereby yielding second density gradients. The extreme positive and negative values of the second density gradients are likewise determined for each region. A ratio of the extreme positive second density gradient to the extreme positive first density gradient is formed for each region, as is a ratio of the magnitude of the extreme negative second density gradient to the magnitude of the extreme negative first density gradient. A pair of sharpness values is then established for each region by subtracting 1 from the respective ratios. All of the sharpness values are now grouped according to the second density gradients or, alternatively, according to the second density gradients, as well as the density ranges of the respective scanned regions. The magnitudes of the sharpness values in each group are summed, and the sums compared with respective reference values. The original is classified as to its sharpness depending upon the results of the comparison so that a judgment may be made as to whether the original is worthwhile reproducing.

REFERENCES:
patent: 4364084 (1982-12-01), Akimoto
patent: 4379632 (1983-04-01), Dedden
patent: 4496983 (1985-01-01), Takenaka
patent: 4531150 (1985-07-01), Amano
patent: 4591923 (1986-05-01), Urabe

Affiliated with

Also associated with

Rating

Method of and arrangement for determining the sharpness of origi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of and arrangement for determining the sharpness of origi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and arrangement for determining the sharpness of origi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1024429