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Detect multiple occurrences of the same Image Target

Discussion in 'Vuforia' started by K1kk0z90_Unity, Jan 10, 2018.

  1. K1kk0z90_Unity

    K1kk0z90_Unity

    Joined:
    Jun 2, 2013
    Posts:
    90
    Hello,
    I'm new to Vuforia. I have a database consisting of only one Image Target. I have printed 2 copies of this image, and I want to detect both simultaneously, whenever they are both in the camera's field of view.
    In VuforiaConfiguration I have set Max Simultaneous Tracked Images to 2. In my scene I have only one instance of that Image Target.
    When I try to run the project (either on an Android phone or in the Unity editor) the augmentation is performed only on one image at a time, even when both copies of the same image are visible on the phone camera (or the PC webcam when testing in Unity editor).
    What am I doing wrong? Thank you in advance for your help! :)
     
    K1kk0z90_Unity, Jan 10, 2018
    #1
    khanhabib likes this.

  2. nahoy

    nahoy

    Joined:
    Dec 10, 2012
    Posts:
    21
    Hey,

    I may be wrong, but you must have 2 different Image Target, not twice the same.
    I think that when it found the Image Target it was looking for, it stops looking for this particular one since it already found it.
    If you want to hack around it, I guess you could create a second Image Target with the exact image, but it will be 2 different Image Targets for the system?
     
    nahoy, Jan 10, 2018
    #2
    K1kk0z90_Unity likes this.

  3. K1kk0z90_Unity

    K1kk0z90_Unity

    Joined:
    Jun 2, 2013
    Posts:
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    Thank you very much for your answer! :)
    I have tried also to duplicate the same Image Target, so that I had 2 instances in the scene, but in the editor I get a Warning:

    and it still detects only one image.

    However, if I have 2 DIFFERENT Image Targets in the scene, it augments both correctly. So it is not possible to augment the same Image Target more than once in the same camera field of view?
     
    K1kk0z90_Unity, Jan 10, 2018
    #3

  4. nahoy

    nahoy

    Joined:
    Dec 10, 2012
    Posts:
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    "So it is not possible to augment the same Image Target more than once in the same camera field of view"
    Seems like we can't :)
     
    nahoy, Jan 10, 2018
    #4

  5. Vuforia-Strasza

    Vuforia-Strasza

    Official Vuforia Employee Vuforia

    Joined:
    Jun 13, 2017
    Posts:
    548
    You cannot track multiple instances of the same target at the current time. VuMarks offers a functionality that is similar to this however. You can design a single image and generate instances with slight variances (similar to a QR code) that can be detected and tracked as separate targets.

    You can read more about VuMarks here: https://library.vuforia.com/articles/Training/VuMark.html
     
    Vuforia-Strasza, Jan 11, 2018
    #5
    pixamentory, khanhabib and K1kk0z90_Unity like this.

  6. K1kk0z90_Unity

    K1kk0z90_Unity

    Joined:
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    Posts:
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    OK, thank you for your answer! :)
     
    K1kk0z90_Unity, Jan 11, 2018
    #6
    Vuforia-Strasza likes this.

  7. pixamentory

    pixamentory

    Joined:
    Mar 15, 2020
    Posts:
    3


    How can i detect multiple vumark instances.......as i am doing now two different instances of vumark showing same id
     
    pixamentory, Apr 4, 2020
    #7