How do i put the results from a calculation as the offset value

hi .. i am trying to set the value of the mask offset from the results i get from a calculation.
this is what i am trying to do
i want to get a ROI from an image, so i used thresholding to separate it form the background
then i find the centroid of the image. i then create a mask a little
larger than the ROI to get rid of the background in an unthresholded
image but the position of the mask is at origin(0,0)
i need the centroid of the mask to be the same as the ROI. so i
subtract the x and y values of the ROI centroid with the centroid of
the mask to get the offset. which is done manually. but i want to
do it for ROIs in different positions, so i want to get the value of
the subtraction staight into the VI .. how can i do that..?? i tried
wiring the value of subtraction into the input of the "set offset" node
but it does not work .. can anyone help me ??thanks very much

i managed to get it done...i did not know how about the cluster to element function .. could you comment on my program?
i'm trying to construct a sign language translator. for the
signing. i am using yellow colored gloves with colored finger tips. the
yellow region is to help me detect the position of the gloves during
thresholding.
1st of all .. i do thresholding to separate the ROI from the
background.. then i put a bouding box around the region of interest. is
there any better and easier way to do this??
could anyone point me in the right direction ?
i am very new to LV and image processing. i always have problem
using some functions especially when it requires lots of settings.
sometimes the help file does no help much ..
my next problem after creating the bounding box is how do i extract
only the colors from the image? i tried color thresholding but the
result is gray scale. how do i extract only the yellow region of the
gloves and the finger tips to be further processed? in MATLAB , color
segmentation is used.. but i can't figure how it works in LV .. please
help me .. thanx
Attachments:
color threshold_andreas_centroid_mask.vi ‏263 KB

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