III. CAMERA BASED DOCUMENT CAPTURING SYSTEM
The proposed method is mainly composed of two steps, detection and removing of text regions, and estimation of feature points to determine a homography for image warping. The overview of the proposed method is illustrated in Fig.1. In this paper, we assume that the shape of a paper is rectangular, and the colour of it is white. The typical example of this assumption is a printed document with a normal A4 size white paper
As an initial step, a white region in a capture image is detected with a simple threshold method. After converting the input colour image into a grey scale image, the maximum value of it is found. A white region in an image with a document is detected with a fixed threshold value as follows.