Image signal processing apparatus

Details Image signal processing apparatus Image signal processing apparatus

1984-09-04

1987-06-16

Birmiel, Howard A.

Image analysis

Histogram processing

For setting a threshold

358282, H04N 140

Patent

active

046741267

ABSTRACT:
An image signal processing apparatus has a CCD for reading an image, a peak detector circuit for detecting a peak value of changes in an analog image signal received from the CCD, a slice level memory circuit for storing a fixed slice level, a comparator, and a slice level change circuit for setting a proper slice level for the image signal. Thickening of a character image or the like is prevented, allowing satisfactory readout of a microfilm image.

REFERENCES:
patent: 4064484 (1977-12-01), Mese et al.
patent: 4228468 (1980-10-01), Nagano
patent: 4247873 (1981-01-01), Decuyer
patent: 4446846 (1984-05-01), Itoh
patent: 4468704 (1984-08-01), Stoffel et al.
patent: 4481666 (1984-11-01), Niwa
patent: 4525747 (1985-06-01), Sakai et al.
patent: 4539600 (1985-09-01), Takahashi et al.
patent: 4562486 (1985-12-01), Suzuki et al.

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