Method and apparatus for handwriting decompression using estimat

Details Method and apparatus for handwriting decompression using estimat Method and apparatus for handwriting decompression using estimat

1994-04-18

1997-04-22

Boudreau, Leo

Image analysis

Image compression or coding

Including details of decompression

382241, 382242, 382119, 382267, 395142, G06K 936, G06K 946

Patent

active

056235550

ABSTRACT:
A method and apparatus for generating a reconstructed image from a compressed image. An exemplary method in accordance with the present invention includes the steps of identifying pairs of compressed image data points having a connection therebetween in a linear segment approximation of the reconstructed image; estimating timing information such as a number of original image data points between each of the connected pairs of compressed image data points; and fitting a spline segment to each of the pairs of compressed image data points and the estimated number of original image data points corresponding thereto, such that the fitted spline segments in combination form the reconstructed image. The reconstructed image may then be smoothed by replacing spline segments which produce undesirable deviations in the reconstructed image with conic section spline segments. The timing information may be estimated using, for example, a linear time model, in which a fixed number of original image data points are estimated between each pair of compressed image data points, or a constant velocity model, in which the estimated number of original image data points is proportional to, or more generally, a function of the distance between the pair of compressed points. One such function of distance particularly well-suited to reconstruction of handwriting images is a square root of the distance.

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