Straightening warped text lines using polynomial regression

Perspective distortion always occurs while scanning thick, bound documents, resulting in two problems in the scanned grayscale image ? (i) shade along the `spine' of the book, and (ii) warping of words in the shade area. We proposed a restoration system to solve these two problems in our previous paper [1]. However the shape of the warped words was not fully restored, since we simply shifted and rotated the warped word. In this paper, we will propose a better method to straighten warped text line using polynomial regression. The implementation results comparing with those of the old system have shown a marked improvement in the image restoration.

• Type: Conference
• Year: 2002
• Where: ICIP
• Authors: Zheng Zhang 0003, Chew Lim Tan
• Keywords: ICIP 2002, Image Processing, Polynomial Regression, Shade Area, Warped Words