Image inclination detecting method and apparatus

Details Image inclination detecting method and apparatus Image inclination detecting method and apparatus

1988-08-02

1989-10-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

3582611, H04N 140

Patent

active

048781240

ABSTRACT:
A image inclination detecting method and an apparatus achieving the method calculate distances between leading edges or between trailing edges of runs (consecutive white or black pixels) that are located on adjacent two scanning lines respectively. From occurrence frequencies of these edge distances, a representative value that may indicate an inclination of the image most clearly is found, and, based on the representative value, the inclination of the image is computed.

REFERENCES:
patent: 3553437 (1971-01-01), Wilson
patent: 4513390 (1985-04-01), Walter
patent: 4533959 (1985-08-01), Sakurai
patent: 4633507 (1986-12-01), Cannistra
patent: 4672461 (1987-06-01), Yoshida
patent: 4723297 (1988-02-01), Postl
patent: 4736443 (1988-04-01), Miyagawa
patent: 4748678 (1988-05-01), Takeda
Masuda et al., "Approach to Smart Document Reader System," IEEE Workshop Capami, 1985, pp. 550-557.

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