Document Image Applications
Dan S. Bloomberg, Luc M. Vincent · 2013
This chapter addresses some problems associated with computer processing of printed documents. Although the graphical rendering process invariably loses structural information, much useful information can be extracted from the pixmaps. Some of that information, such as skew, warp and text orientation detection, is related to the digitization process and is useful for improving the rendering on a screen or paper. The layout hierarchy can be used to reflow the text for small displays or magnified printing. Other information is useful for organizing the information in an index, or for compressing the image data. The chapter is concerned with robust and efficient methods for extracting such useful data. Segmentation is the fundamental operation in document image analysis (DIA). The ability to carry out fast pattern matching between elements of document images, such as connected component or character or word images, is an important feature of many applications. Controlled Vocabulary Terms document image processing; image segmentation; pattern matching; text detection