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Device for electrical variable magnification of document image

  • US 4,532,602 A
  • Filed: 03/08/1982
  • Issued: 07/30/1985
  • Est. Priority Date: 03/08/1982
  • Status: Expired due to Fees
First Claim
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1. A system for altering the size of an image by a desired magnification after optical scanning thereof by providing a plurality of output scan values different in number from the number of sampled scan signals produced during optical scanning, said output scan values being representative of the density of the image at pixel locations spaced across the image in dependence upon a selected magnification value, said system comprising:

  • scanning means for providing a sequence of sampled scan signals, each such sampled scan signal being representative of the image density at an associated pixel location in a row of pixel locations across said image,converter means for converting said sampled scan signals to a corresponding sequence of digital scan values,control circuit means, responsive to said magnification value, for providing a plurality of interpolation control values in synchronism with said sequence of digital scan values, said interpolation control values indicating the spatial relationship of output scan values with respect to pairs of successive digital scan values, andinterpolation means, responsive to said sequence of digital scan values and to said interpolation control values, for interpolating between pairs of said digital scan values to provide said output scan values.

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