Doug’s MATLAB Video Tutorials

January 18th, 2008

Cool Feature: Video processing demos

 Thank you to everyone that answered the survey from my last post. I will be processing the results and reporting in my next post. Changes are already being planned based on the results. This three minute video shows you how to view product demos in the Video and Image Processing blockset. Motion detection and tracking is covered in the first demo and photo mosaicking from video is covered in the second.
Find the files here. PodCast here Other videos have been gathered here: http://blogs.mathworks.com/pick/category/video/ Other cool feature posts have been gathered here: http://blogs.mathworks.com/pick/category/cool-feature/

By Doug Hull

14:50 UTC | Posted in Format: PodCast, Format: Video, Topic: Cool feature | Permalink |

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7 Responses to “Cool Feature: Video processing demos”

  1. Szymon Gackowski replied on February 3rd, 2008 at 07:36 UTC :

    ok, that is really cool. But is there any possibility to do this in real time using data aquisition? how to aquire data from usb web cam?
    best regards!
    Simon

  2. Bruce Tannenbaum replied on February 4th, 2008 at 10:10 UTC :

    Hi Szymon,

    With the Image Acquisition Toolbox, you can acquire images or video into Simulink and/or MATLAB. For Simulink, you would use the “From Video Device” block. This supports USB web cameras, as well as a broad range of frame grabbers and scientific digital cameras. For more information on the supported hardware, look here: http://www.mathworks.com/products/imaq/supportedio.html

    - Bruce

  3. Szymon Gackowski replied on February 5th, 2008 at 11:57 UTC :

    Thank you Bruce!
    That was very helpful!

  4. elya replied on August 27th, 2008 at 21:04 UTC :

    hi,i’m using MATLAB 7.0.

    i’m a beginner. I want to read/call video (.avi) file in MATLAB but i couldn’t find any function. how to call the video (.avi) in matlab? how to extract the video frame by frame?

    thanks

  5. Scott Hirsch replied on August 28th, 2008 at 12:47 UTC :

    Elya -

    In v7.0, try aviread. This has straightforward syntax for reading a single frame - you could just embed in a for loop if that’s appropriate.

    Readers with newer versions should check out mmreader - introduced on Windows in R2007b, Mac in R2008a.

    - scott

  6. jhon diaz replied on August 4th, 2009 at 20:24 UTC :

    Hi.
    I’m a beginer in Matlab and since three months ago I started working with video files. With the image processing toolbox and image acquisition toolbox I can select my frames and process some analysis, however I’m planning to execute an event depending on what happens in the video (tracking objects). This event is to output a signal for triggering an external device. Could someone give me an idea of how to do this? Thanks a lot.

  7. dhull replied on August 5th, 2009 at 20:07 UTC :

    jhon,

    I think you need to be more specific with your question.

    What do you mean by “executing an event” This makes me think of either callbacks or Simulink/Stateflow.

    You want this event to trigger and external device. Do you know how to trigger the external advice in MATLAB? Are you trying to work in “hard real time”?

    Doug

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