Android Graph Reader

In this paper, we aim to design and implement a system that allows a user to quickly and accurately read values of points of interest in graphs. This system focuses on two types of graphs: simple line graphs and 2D grayscale images. These images are obtained through photographs of printed graphs taken with an Android phone. Our final product is a portable graph reader that compensates for the non-idealities that arise from a camera phone. Techniques used include perspective correction, lighting compensation, and feature detection. Key words—image processing, image segmentation, OCR, graph