virtual keyboard

With fast emerging technology, all devices are becoming compact and there is a human feeling that there should be some simple system which helps to enter text. Standard keyboard is difficult for people to carry and difficult to use. There are some existing virtual keyboards which are based on cmos technique, vibration calculated using some softwares and using some hardwares, but they are inefficient in locating exact location. To solve this problem, we go for image processing technique. We use camera to implement this technique. In this paper, we see how a paper can be used as an efficient input device. The process undergoes a series of phases such as absolute difference, threshold, contour and perspective transformation that makes our proposal more efficient.