Scan reading method including density measuring and edge detecti

Details Scan reading method including density measuring and edge detecti Scan reading method including density measuring and edge detecti

1992-04-20

1993-05-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250234, G01N 2186

Patent

active

052142949

ABSTRACT:
A scan reading method according to this invention includes the steps of: causing a line memory to store original image data for one line; obtaining a density average value of the one-line image data or a variation rate thereof; and detecting the edge of the original by comparing the average density value or the variation rate thereof with a predetermined threshold value after finishing a scan over the original or during the scan. A scan reading method also includes the steps of: preparing a density histogram from the one line image data in the original region; optionally obtaining the average density value of the variation rate thereof; detecting the top end and terminal of the original from that value; and calculating highlight and shadow densities from the density histograms after finishing the scan over the original by use of a scanner. Based on the methods of the present invention, it is therefore possible to automatically detect the edge of the original and perform a density auto-measurement at low costs with a high accuracy with the aid of a small capacity line memory without adding a multiplicity of sensors and incorporating a large capacity buffer memory.

REFERENCES:
patent: 4864149 (1989-09-01), Matsumoto

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