Problem using the IMAQ Extract function.Not getting two different image out

Hi, I am trying to use the multiple IMAQ extract functions to get certain parts of the webcam image and then using the color extract function to get the average RGB values. The problem is that both the IMAQ extract functions give the same image on its output port. The block diagram snippet and VI are attached below. Also, please let me know if there is a better way of doing this. I need to expand this later to extract rgb values of about 40-50 different parts of the image instead of just two shown below.
Solved!
Go to Solution.
Attachments:
Extract RGB Data.vi ‏104 KB

You did not create another image that you should wire to the input "Image Dst" of "IMAQ Extract". That's why you always operate on the original image (which you should not do if you intend to operate on several regions of the image).
Solution:
(1) Create a new image and wire this to "Image Dst".
(2) Apply the histogram operation sequentially (e.g. in a loop).
That way you will notice, that Image Dst contains actually(!) the region you have specified. (Put a probe on the image wire that goes from the Extract VI to the Histogram VI).

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Problem using the IMAQ Extract function.Not getting two different image out

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