International Journal of Emerging Trends in Engineering Research (IJETER), Vol. 3 No.6, Pages : 275-279 (2015) Special Issue of NCTET 2K15 - Held on June 13, 2015 in SV College of Engineering, Tirupati http://warse.org/IJETER/static/pdf/Issue/NCTET2015sp53.pdf 275 ISSN 2347 - 3983 A GUI FOR PROJECTOR-CAMERA USING TOUCH DETECTION K.Vinod 1 , P.Dileep Kumar 2 1 PG Student, Department of ECE, Sri Venkateswara College of Engineering, Tirupati, Andhra Pradesh, India. vinu.vinod59@gmail.com 2 Assistant Professor, Department of ECE, Sri Venkateswara College of Engineering, Tirupati, Andhra Pradesh, India. dileepk38@gmail.com ABSTRACT In this paper, we propose a novel interactive projection system (IPS), which enables bare-finger touch interaction on regular planar surfaces (e.g., walls, tables), with only one standard camera and one projector. The challenge of bare-finger touch detection is recovering the touching information just from the 2-D image captured by the camera. In our method, the graphical user interface (GUI) button is projected on the surface and is distorted by the finger when clicking it, and there is a significant positive correlation between the button’s distortion and the finger’s height to the surface. Therefore, we propose a novel, fast, and robust algorithm, which takes advantage of the button’s distortion to detect the touch action. The existing keyboards used keys based keyboard for typing on the computer. These keyboards are working on the mechanical push principle. But for the small devices like mobile phones and tablets it is impossible to carry big keyboard with them. The touch screen based keyboards available in such devices are very inconvenient to write because the size of people finger is big and the size of the keys on the touch screen is small. So typing work on the small devices is not convenient and on computer our fingers get pain after doing long time typing work because of mechanical vibration of the keys. Keywords—Edge detection, human–computer interaction, projector–camera system, touch detection, triangulation. I. INTRODUCTION Mobile devices (e.g., mobile phones, pads) with significant computational power and capabilities have been a part of our daily life. Benefiting from the mall size of these devices, they are easy to carry. However, the screen real estate of today’s mobile devices is limited by their small sizes. This greatly iminishes their usability, functionality, and comfort. A pico-projector can be used to significantly increase the limited screen size of the mobile devices. With the development of the projection technology, we believe that embedded projectors in the mobile phones will be very common in the future, and people will enjoy a way of displaying digital contents on everyday surfaces. Meanwhile, the interactions (e.g., touch, gesture) on the projected display are thought to be appealing. To achieve the touch interaction, the biggest challenge lies in how to determine whether the fingers touch the projected surface or not. Most of the researchers in this area use multicameras or a depth camera to obtain the relative position between the fingertip and the projected surface.