Interactive whiteboard involving human interaction have been an active field of research in past years in human computer interaction (HCI). There is a need for adoption of natural interfaces between user and computing devices. This is trending in educational as well as corporate sector where various interactive application, tools and methodologies are used to make the presentation, summarization of difficult concepts easy and also to simulate collaborative work and enhance teaching practices. For Instance, it is a common practice to draw business processes on a traditional whiteboard, using conventional modeling notation such as UML, BPMN, during meetings between software programmers and business clients. Since it is a traditional whiteboard, software developer may need to redesign the process diagram on his computer by referring the whiteboard, this can be time consuming. Alternative way will be to use pen-based input device such as an electronic interactive whiteboard or graphics tablet. Use and working of interactive whiteboard have received researchers' attention as it has been found to be easy and highly effective interaction method. This paper presents a short review for interactive whiteboard technology and its operations proposed in the literature. Some examples of applications are also investigated.

In this paper, we propose an interaction based projection display system, which enables an infrared pen touch interaction on flat surface (e.g. walls, whiteboard, tables), with a webcam (with an infrared filter removed) and a projector. The challenge of infrared pen touch detection is to sense the touching and movement information of an infrared pen on the surface just from the 2-dimensional image captured by the webcam. In our method, the content of a computer is projected on the surface and the user interacts with the surface using an infrared pen, the movement of an infrared pen is captured by the webcam. Here, the infrared LED light act as a tracking point which helps in controlling the content projected on surface. The proposed method is performed in three stages: 1) the infrared pen LED image is captured and tracked using webcam 2) the calibration of webcamprojector setup is done by principle of Homography 3) the tracked coordinates or location of Infrared pen LED is mapped to computer cursor. By this way, movement of infrared pen allows user to control computer content projected on the surface.