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Image reader that stores sets of luminance correction data corresponding to document a surface height

  • US 5,969,829 A
  • Filed: 09/18/1997
  • Issued: 10/19/1999
  • Est. Priority Date: 09/19/1996
  • Status: Expired due to Term
First Claim
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1. An image reader which reads a document surface of an open book-like document placed on a document platen in a face upward condition and detects a height of the document surface, said image reader comprising:

  • illuminating means for illuminating the document surface, said illuminating means having illuminance irregularity;

    reading means for converting an image of the document surface to image data;

    memory means for storing a plurality of sets of illuminance correction data to correct differences of illuminance of image data of the document surface, each set corresponding to a height of the document surface;

    detecting means for detecting a height distribution of the document surface; and

    correcting means for correcting the image data using said illuminance correction data sets based on the height distribution.

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