The document describes a virtual touch screen project that allows basic computer operations to be controlled using a laser pointer and webcam. Key components are a laser pointer to indicate location and a webcam to capture the projected area. Frames from the webcam are analyzed to identify bright spots from the laser pointer and transform the coordinates to mouse movements and clicks on the computer screen.

1. Virtual Touch Screen This image is from a video http://in.youtube.com/watch?v=OTCWhraw2Xw

2. Team Members K.JAGADEESH - 660752022 V.PRASANTHI - 660752044 K.SUPRIYA - 660752025 K.CHANDRASEKHAR - 660752020 M.CHAKRADHAR - 660752037 Team Guide : Mercy Vinolia (Asst.Professor) CSE Department

3. Objective Objective of our project is to develop an application that provides a means of accessing the control of basic computer operations using a laser light and a webcam. User normally handles his operations using mouse and keyboard. These may not be easiest way at every time. Programming Language : C# in .NET Framework

4. Components required A laser pointer � for tracing location. A webcam � which provides the external environment to the computer through video.

5. Analysis Webcam is located so that it exactly captures the projected area. A red color laser light is preferred and external light effects should be minimum. A webcam is installed with its driver.

6. Block diagram avicap32.dll (to run webcam and save video as .avi format) AVIStreamGetFrame() (The frame data is returned as a packed DIB) Bitmap.Getpixel(x,y) brightness = (299 * red + 587 * green + 114 * blue) / 1000 User32.dll Mouse_event(dwflags,dx,dy,dwdata,dwextra) Transformation of x and y To the screen resolution

7. Identifying laser pointer for (int y = 0; y < imageHeight; y += 1) { for (int x = 0; x < imageWidth; x += 1) { byte red, green, blue; red = Bitmap.GetPixel(x, y).red; green = Bitmap.GetPixel(x, y).green; blue = Bitmap.GetPixel(x, y).blue; float brightness = (299 * red + 587 * green + 114 * blue) / 1000; if (brightness > threshold) { brightest = brightness; xPos = x; yPos = y; brightnessFound = true; } // x loop }}

8. Transformation : cursorX = ((float)screenWidth / imageWidth) * xPos; cursorY = ((float)screenHeight / imageHeight) * yPos; Mouse LEFT CLICK : Dllimport � User32.dll mouse_event(MOUSEEVENTF_LEFTDOWN, cursorX, cursorY, 0, 0);