Image reader having height distribution correction for a read do

Details Image reader having height distribution correction for a read do Image reader having height distribution correction for a read do

1995-11-07

1998-11-03

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358474, 358475, 358488, 355 25, 355 82, 399362, H04N 104, G03G 1500, G03B 2732

Patent

active

058317503

ABSTRACT:
An image reading apparatus which reads document surfaces of open book-like documents placed on a document platen in a face upward condition and detects height of the document to control an image reading operation. An image reader reads the document platen on which the document is placed and outputs image data. A height detector detects height distribution of the document, and a discrimination device determines whether or not abnormalities occur in the height distribution of the document. A memory stores the height distribution of the document, and a update device updates the height distribution of the document stored in the memory when the abnormalities do not occur in the height distribution of the document. A correcting device corrects distortion of the image data caused by the height of the document in accordance with the height distribution of the document stored in the memory.

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