Abstract: People rely more and more on mobile devices to read various digital contents. The
variation on parameters such as screen resolution, aspect ratio of these devices presents new
challenges on digital content processing. Image retargeting has become popular in the past decade.
Various content-aware methods are presented to reduce the distortion of important object when the
image is scaled. However, for those bitmap represented heterogeneous documents which contains
various elements, due to the high resolution, it can only be partially displayed on devices with small
screen region. Frequently switch between scale and translate are required to read the whole document,
which obviously affect user’s reading experience. We propose a retargeting method for heterogeneous
document. We firstly analysis the layout of document in a local manner, and then extract the
appropriate rectangular reading area and resize it to match the screen. Our method avoids the tedious
scale and translation operations, and thus improves the reading experience greatly.

Key words: image retargeting, heterogeneous document, layout analysis, homogeneous region, region
growing