Device for electrical variable magnification of document image
First Claim
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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Accused Products
Abstract
A system for altering the size of an image by a desired magnification after optical scanning thereof provides a plurality of output scan values differing in number from the number of sampled scan signals produced during the optical scanning. The output scan values are representative of the density of the image at pixel locations spaced across the image in dependence upon a selected magnification value. The system includes scanning means for providing the sample scan signals and converter means for converting the sampled scan signals to a corresponding sequence of digital scan values. A control circuit is responsive to a selected magnification value for providing a plurality of interpolation control values in synchronism with the sequence of digital scan values. The interpolation control values indicate the spatial relationship of output scan values with respect to pairs of successive digital scan values. An interpolation circuit is responsive to the sequence of digital scan values and to the interpolation control values and interpolates between pairs of the digital scan values to provide the output scan values.
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Citations
12 Claims
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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:
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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, and interpolation 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of providing a sequence of output scan values differing in number from a sequence of sample scan signals produced during optical scanning of an image such that the output scan values specify an image which differs in size from the optically scanned image, comprising the steps of:
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optically scanning an image to provide a sequence of sample scan signals, each such sample scan signal being representative of the image density at an associated pixel location in a row of pixel locations across the image, converting said sequence of sample scan signals to a corresponding sequence of digital scan values, and sampling said sequence of digital scan values at predetermined evenly spaced points in said sequence by interpolating between pairs of successive digital scan values to provide a sequence of output scan values differing in number from said sequence of digital scan values, the spacing between said evenly spaced points being determined by the change in image size to be effected. - View Dependent Claims (10, 11, 12)
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Specification