For user convenience, processing of document images captured by a
digital camera has been attracted much attention.
However, most existing processing methods require
an upright image such like captured by a scanner.
Therefore, we have to cancel
perspective distortion of a camera-captured image
before processing.
Although there are rectification methods of the distortion,
most of them work under certain assumptions on the layout;
the borders of a document are available,
textlines are in parallel,
a stereo camera or a video image is required and so on.
In this paper, we propose a layout-free rectification method
which requires none of the above assumptions.
We confirm the effectiveness of the proposed method by experiments.
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