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Image operation

Image operation

Hello everybody,


I am trying to do a simple task yet I have been unable to complete it successfully.


I have an avi video and I want to extract a particular frame from it, then I want to subtract this frame to other frames in the video, this could be helpful for instance to remove the background from a video. The video corresponds to a bubble that grows and collapses in a few frames.


I am able to do the subtraction from operation (i.e.. Frame 2 - frame 1); I then convert the resulting image to a grayscale image (SSL) with the IMAQ cast image VI/ However, the resulting image is all black. I expected to see the difference between the two images as a dark ring that shows the growth of the bubble and not only a black image. 


Can somebody give me a hand with this problem?


I am attaching the VI and the video(Test.avi). 



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Message 1 of 4

Re: Image operation

Hi Roberto83


You probably have to allocate memory for both Frame A and B by using IMAQ Create.


See attached VI.



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Message 2 of 4

Re: Image operation

Thank you for your assistance Vegemite.


I was unabel to open the vi because I am using version 8.5, by any chance can you save it a an 8.5 version.


Thanks again



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Message 3 of 4

Re: Image operation

Hi Rob

here is 8.5 version of VI.



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Message 4 of 4