Advanced Vision - FAQ

  1. Getting LEARN access before you're registered for AV
    1. Go to Learn login page
    2. Login with your EASE password
    3. Click on the red Self-Enrol tab at the top right
    4. Click on the 'Browse Course Catalogue' button in the right column top box labeled 'Course Catalogue (self-enrol courses)'
    5. Search for: ID - Contains - INFR11031
    6. Hover with the mouse over the course ID for the current year and you should see a little down arrow button. Click on it and then click on Enrol.
    7. Click on 'Submit'
    8. Click on 'OK' at bottom right of page
  2. Prerequisites
    IVR is normally a required prerequisite to do the AV course. Please consult the lecturer and your course organiser (M.Sc. / 4th year) before if you wish to take this course without having previously taken IVR.
  3. Auditing
    Auditing of the course (i.e. attending lectures without doing assessed practicals or exams) is allowed. Auditing the course will not count towards any degree credit. Please do not let this activity interfere with your assessed modules.
  4. Matlab
    Matlab and the Matlab image processing toolkit is commercially licensed software. It is not available from the school for use on personal home computers. It can be used from outwith the school via remote access to the school systems.
  5. Lab Partners
    You get to choose your own lab partner for the practicals. They should be different on the two practicals that require teams of two.
  6. Lab Access
    The lab is Forrest Hill ga11 and you can use it almost 24/7. There are 3 reserved hours with the AV demonstrator, Monday 4-5,5-6 and Thus 4-5. Come to one of these sessions if you'd like some advice/help. IAR has reserved the lab Monday 2-3, Weds 12-1 and Thurs 2-3. Please do not use the lab during these times and be considerate to other lab users.
  7. Webcam Image Capture

    There are 4 types of usable webcam available in the IPAB teaching lab:

    1. A rectangular Logitech camera
    2. A rectangular Philips camera
    3. A dark silver ball Logitech camera
    4. A dark silver ball Logitech camera labeled with IPAB

    There is also a light silver ball not labeled with IPAB that has been left on the supplies shelf. The current driver is not working for these.

    All cameras can capture images with the same commands:
    mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0
    allows you to preview images on the screen before capture (NOTE: v-4-el-2, not v-4-one-2). This is useful for adjusting the camera and target positions until the the full scene is in view. You can also adjust the focus by twisting the ring around the lens. When you are satisfied with the position, kill the capture with CTRL-C.

    When you want to capture an image for processing, use:
    mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0 -frames 5 -vo jpeg
    This will capture 5 frames into your current directory. The captured frames will be in the files 0000000X.jpg, where X=1/2/3/4/5. Check these (using e.g. xv or gimp) and use one of the good images. If you are doing automatic capture from within a program, then you probably want to use one of images 4 or 5 as sometimes image 1-3 are corrupted.

  8. Convolution
    > I just wanted to see if I had the right idea about the convolution
    > formulae on slide 9
    >
    > for the 'mid lecture problem' the mask is  [1 2 1] which have to be
    > indexed -1 0 1, to allow the formulae to sum from -N to N .
    >
    > So for example
    >
    > Output(5) = weight(-1)*input(5- -1) + weight(0)*input(5-0)
    +weight(1)*input(5- 1)
    >
    >                  = weight(-1)*input(6) + weight(0)*input(5) +
    weight(1)*input(4)
    >
    > So if the mask was some non symmetric distribution it would be important to
    > reverse it before placing under the Input when calculating the output
    > i.e
    > [20 20 20 20 10 10 10 10] convoled with [0 1 2] is
    >
    > [60 60 60 50 30 30] not [60 60 40 30 30 30]
    
    
    Yes - this is correct.
    
    There is a related autocorrelation function that does not reverse the
    mask order, but that this is a different matter.
    
  9. Creating PDF files under windows
    How do I create a PDF file if I did my assignment in MS windows based application?
    Download and install the free software available from here. You must install both the PDFwriter and the ghostscript convertor. PDF files can then be created by using File Menu->Print from any application and selecting "Cute PDFWriter" as the printer.

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This page is maintained by the course lecturer, Bob Fisher, rbf@inf.ed.ac.uk, room IF 1.26, ext 513441.


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