![]() ![]() Step 5: The Camera Calibration ToolboxĪlthough “the camera calibration toolbox” as long as 3 different angles to shoot photos can be a good camera calibration, but in this design used 9 different angles to shoot photos of the camera calibration the calibration parameters, the parameters are applied to correct algorithm in real-time operation can be real-time correction of distortion of the picture. The picture is taken by using the angle of view 150 camera is a distortion, and in order to Calibration the distortion of the picture using Matlab camera Calibration tool ‘Calibration Toolbox Camera’. Making a virtual laser keyboard 1> The Laser Projection Virtual Keyboard DesignedĪt the bottom of the infrared laser emission from a surface of a covering space in the infrared range, of course this plane to cover the entire keyboard, a keyboard in the center of the keyboard is the projection contour shape of the keyboard is mainly used for calibration, at the top of the real-time camera outside the graphics and pass data to the computer, because the laser light is a horizontal and parallel so no object occlusion camera is unable to detect the infrared signal, but if there are objects in the infrared laser region when the occluded objects’ surface will be covered with the infrared camera will detect the infrared signal, computer access to the signal sent by the camera after a certain the algorithm to obtain coordinates in the picture of infrared spot and then put the coordinate mapping to real keyboard position so as to realize its function. When a user presses a “virtual key”, the reflected laser light will be captured by the camera and a signal processing software installed on the PC/Mac performs all the critical jobs: recognizing the user’s finger top, perform distance measurement and mapping the position of the user finger top to the related key character. The main devices and technologies used to project the hologram are a diffractive optical element, red laser diode, CMOS camera and sensor chip and an infrared (IR) laser diode The projection is realized in four main steps and via three modules: projection module, sensor module and illumination module. The laser keyboard uses laser and infra-red technology to create the virtual keyboard and to project the hologram of a keyboard on a flat surface. detected coordinates determine actions or characters to be generated.Sensor chip determines where infrared beam was broken or disturbed.Camera photographs angle of incoming infrared light.Reflected infrared beam passes through an infrared filter to camera.Finger makes keystroke on virtual keyboard and this breaks infrared beam and infrared light is reflected back to projector.An invisible infrared beam is projected above the virtual keyboard.Some devices use a second (invisible infrared) beam: detected co-ordinates determine actions or characters to be generated.A sensor or camera in the projector picks up the finger movements.A laser or beamer projects visible virtual keyboard onto level surface.They have the advantage that users can write texts or e-mails easier and faster, just as with a usual keyboard and that when it is turned off it disappears suddenly and completely.Ī projection keyboard generally works as follows : The device projecting the keyboard comes in different sizes but they are normally the size of a small mobile phone, 90 x 34 x 24 mm. The virtual keyboard and mouse is the only computer peripheral part that works in complete darkness and it is suitable for Blackberries, Smartphones, PDAs, and Mac & Tablet PCs. The beam is equipped with sensors and cameras that translate the place when the infrared light was broken into characters This type of product projects an invisible infrared beam above the virtual keyboard on which one uses the fingers to make keystrokes on the projected keyboard. ![]() Some systems use an invisible infrared as a second beam to create a wireless laser keyboard projection. The projecting device is equipped with a sensor or sensorial camera that picks up the finger movements and touches and when these are detected, they are transformed into actions or characters. ![]() This is how these devices work: the visible virtual keyboard is projected onto the surface by a laser or with some systems or by a beamer. Most systems may be used as a virtual mouse or virtual piano. The laser keyboard projection is sort of an image of a real keyboard but which does not really exist i.e. This technology is able to record the finger movements and translate them into keystrokes in the device, although there are no physical keys. This type of keyboard is also called projection keyboard. The wireless laser keyboard and mouse are virtual parts of peripheral hardware that can be projected and touched on any type of surfaces. The laser keyboard and mouse are the ultimate technology when it comes to computer science. ![]()
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