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Method and apparatus for processing or resizing digital images, such as images of bar code symbols

  • US 5,987,192 A
  • Filed: 09/18/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 09/18/1997
  • Status: Expired due to Term
First Claim
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1. Bar code reading apparatus for imaging a data collection symbol representing encoded information, the apparatus comprising:

  • a sensor that receives light reflected from the symbol and produces an output signal therefrom that represents the reflectance of the bars and spaces of the symbol;

    a memory for storing at least a portion of an image of the symbol, the stored image being comprised of pixels in at least one dimension, each pixel having an intensity value; and

    image processing circuitry that retrieves a set of M pixels from the memory and applies an M-pixel sized window to the set of M pixels, replicates a first pixel in the set of M pixels in the window j times and replicates at least a second pixel in the set of M pixels in the window k times, sorts the M set of pixels and replicated pixels, selects an n-th largest pixel in the sorted pixels where the n-th largest pixel is not a largest pixel in the sorted pixels, stores the selected pixel in the memory, and repeatedly retrieves another set of M pixels and again replicates, sorts, selects and stores for the another set of M pixels to generate a reduced size image based on the stored image, and wherein j is greater than k, and j and k are greater than one.

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