Method for determining the profile of a bound document with stru

Details Method for determining the profile of a bound document with stru Method for determining the profile of a bound document with stru

1996-05-30

1998-11-10

Moore, David K.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358296, 358493, 358466, H04N 1387

Patent

active

058352414

ABSTRACT:
An overhead scanning system records pages from bound documents in an upright and open condition. A light stripe is projected onto each page of the bound document to measure the non-planar deformations of each page. The scanning system records a first image with the light stripe and a second image without the light stripe. After identifying a set of pixels representing the light stripe in the first image, the set of pixels is smoothed to minimize large transitions between scan lines. Subsequently, a crease is identified in the set of pixels that represents the spine of the bound document. The pixels forming the crease are replaced with pixels that are defined using a parametric model that approximates the spine region of a bound document. This substitution insures that the spine region of a bound document is accurately depicted before determining a page shape transform with the identified set of pixels representing defining the projected light stripe. An image correction system de-warps the second image using the page shape transform and a perspective transform to correct distortion due to the pages of the bound document being curved relative to the support plane of the system. The de-warped image is determined by "polling" location in the second image for output values.

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Ballard, D.H., Brown, C.M., "Imaging Device for Computer Vision," Computer Vision, Published by Prentice-Hall, Inc., Englewood Cliffs, NJ, pp. 52-56.
Strat, T.M., "Recovering the Camera Parameters from a Transformation Matrix," Readings in Computer Vision: Issues, Problems, Principles, and Paradigms, Morgan Kaufmann Publishers, Inc., Los Altos, CA., pp. 93-100.

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