Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1997-09-18
1999-11-16
Couso, Jose L.
Image analysis
Image transformation or preprocessing
Changing the image coordinates
382205, 382237, 382299, 382318, G06K 932
Patent
active
059871920
ABSTRACT:
A method and apparatus for resizing or processing images initially retrieves a one-dimensional sample of the image, such as a line of pixels. The image can be of a machine-readable symbol, or other data. A moving window having, for example, five pixels, includes a center "hard core" and four surrounding pixels. Two or more structural sets or multisets are applied to the window to produce a set of pixels greater than the set of pixels in the original image. For example, the center pixel is repeated three times, while immediately adjacent left and right pixels are repeated twice. Thus, a series of nine pixels results. The resulting nine pixels are then sorted based on descending gray scale levels. The n-th largest pixels is selected, such as the third largest. The image is updated, the window moved, and the method repeats again. Pyramid filtering, cubic convolution interpolation, or other techniques can be used to reduce the size of an image, and more complex windows and structural sets can be employed.
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Coffman Ken
Maltsev Pavel A.
Couso Jose L.
Desire Gregory
Intermec IP Corporation
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