| 1 | MotionMouse, Rick van der Zwet - 0433373 <hvdzwet@liacs.nl>
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| 2 |
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| 3 | = Abstract =
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| 4 | 'Enhanced' presentation utility. Mouse interaction device using gestures or a
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| 5 | laser pointer and a WiiRemote controllor.
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| 6 |
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| 7 | = Introduction =
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| 8 | Current presentation devices only have a few forward/backward buttons and a
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| 9 | laser pointer, this is not suffient when presenting interactive media (e.g.
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| 10 | switching between many diffent input sources.). As now-a-days almost all
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| 11 | laptops has a high quality webcam included and are powerful devices. Using
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| 12 | commodity tools there needs to make a much better use of the resources
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| 13 | available.
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| 14 |
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| 15 | = Background =
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| 16 | Alternative available devices 'emulate' the mouse using gyrosensors or a
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| 17 | trackball. The combination with laser tracking has been tried already in a
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| 18 | different form with a more fixed setup [1]. Laser pointer tracking has also
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| 19 | been done, but most of the times not in lively envirionments. Gesture tracking
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| 20 | has been done in a fixed setup with a easy distinguable object like a dark
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| 21 | background [2], or a well coloured glove [3] or in a more advanced but static
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| 22 | setup [4]. Also using high-tech equipment [5].
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| 23 |
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| 24 | = Implementation =
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| 25 | The system is build on a Macbook Pro (model:4,1) running Ubuntu 9.10 amd64. The
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| 26 | Webcam used for tracking is an USB Trust WB-6250X Webcam (145f:0142). The
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| 27 | OpenCV package (2.0.0) is compiled from source. The WiiRemote is an model from
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| 28 | late 2008. The laser pointer used is a green laser pointer with high density
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| 29 | (50mW, WARNING: use in protected envirionments with IR safety eye wear).
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| 30 |
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| 31 | The Beamer used had an resolution of 800x600 and was projecting on a white
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| 32 | stone wall. The webcam was placed on top of the beamer.
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| 33 |
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| 34 | = Description =
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| 35 | The system consists of 3 components. The buttons and it's handeling are done
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| 36 | using the WiiRemote which connects to the laptop using bluetooth and the Open
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| 37 | Source program cwiid [6].
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| 38 |
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| 39 | The second component is build on the OpenCV [7] package. It detect the laser
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| 40 | pointer using a difference-algoritm. 1) Blurring is applied to get rid of the
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| 41 | webcam detections errors (.e.g wrong pictures). 2) The current frame values are
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| 42 | subtracted by the previous frame. 3) The spot of X times Y with the highest Red
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| 43 | and Green density is detected as the current laser pointer position, if the
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| 44 | threshold is above a certain value. The C source code is found at [8].
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| 45 |
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| 46 | The mouse location is updated to it's right location taking into count
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| 47 | transformation from the virtual to the real screen. The UNIX X11 implementation
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| 48 | is done using parts of the xdotool [9] package.
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| 49 |
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| 50 | = Discussion and Conclusions =
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| 51 | The status of the project could be marked as an early alpha. Mouse updates and
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| 52 | clicking works fine, altough the initialisation phase (the so called pairing)
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| 53 | could use some improvement. The tracking works if the image is static and there
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| 54 | is not many distorting with regards to movement.
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| 55 |
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| 56 | The laser to mouse pointer caliberation is not yet working has has to be done
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| 57 | by hand, the checkerboard image (in the source [8]) also needs to be done
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| 58 | automatically.
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| 59 |
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| 60 | Brightness control is a part to focus on further research. The Webcam
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| 61 | now tries to optimize for the whole screen, causing the laser pointer to
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| 62 | disappear in a bright light blob.
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| 63 |
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| 64 | The tracking algoritm now has trouble using moving images. As the picture send
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| 65 | to the output could be 'snooped' as well. There should be some more smarter
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| 66 | detection posible of the laser pointer.
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| 67 |
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| 68 | = References =
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| 69 | [1] Christopher Armenio, Design of a Laser Controlled Mouse Using OpenCV, 2008
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| 70 |
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| 71 | [2] Cristina Manresa, Javier Varona, Ramon Mas and Francisco J. Perales, Real
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| 72 | âTime Hand Tracking and Gesture Recognition for Human-Computer Interaction,
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| 73 | Electronic Letters on Computer Vision and Image Analysis 0(0):1-7, 2000
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| 74 |
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| 75 | [3] Robert Y. Wan, Jovan Popovi, Real-Time Hand-Tracking with a Color Glove,
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| 76 | 2009
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| 77 |
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| 78 | [4] Shahzad Malik, Real-time Hand Tracking and Finger Tracking for Interaction,
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| 79 | 2003
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| 80 |
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| 81 | [5] Daniel Kurz, et al., Laser Pointer Tracking in Projector-Augmented
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| 82 | Architectural Environments, 2007
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| 83 |
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| 84 | [6] cwiid, http://github.com/abstrakraft/cwiid
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| 85 |
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| 86 | [7] OpenCV, http://opencv.willowgarage.com
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| 87 |
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| 88 | [8] Detection software, http://rickvanderzwet.nl/svn/personal/liacs/mms/project/
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| 89 |
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| 90 | [9] xdotool, http://www.semicomplete.com/projects/xdotool/
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