Finding particular R, G, B value by comparing with threshold and fetching its corresponding pixel locations from table
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I have a 20*3 rgbvalues matrix of an image
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/190683/image.png)
and given below table cx and cy are its corresponding pixel locations
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/190684/image.png)
and now i want to check in the rgbvalues table which satisfying the following condition,
((R>=0 && R<=100) && (G>=0 && G<=100) &&(B>=0 && B<=100)) and the corresponding cx and cy pixel location values. can anybody help me?
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Image Analyst
le 19 Mai 2018
Try this:
mask = (R>=0 & R<=100) & (G>=0 & G<=100) & (B>=0 & B<=100);
cxInMask = cx(mask);
cyInMask = cy(mask);
Take special note that I am using only single ampersands, not double ones because I want to do operations on a logical vector.
For your data, like Jan said, both will be empty since no row satisfies your criteria.
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Image Analyst
le 27 Mai 2018
No, using a single ampersand will create a binary image - a mask image.
"How can be make it possible?" I already showed you. Just do what I said. Don't change it back to what you said which will make it not work again. Make adjustments to the values if you want but don't change the ampersands to double ampersands.
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Jan
le 19 Mai 2018
None of the colors in the table satisfies B <= 100. What ever the relation between the two tables is and whatever "corresponding cx and cy pixel location" means, while no element of B is matching, the condition is false in every case.
This solution seems to be trivial. Therefore I guess, you meant something else. Then please explain it again.
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meenu v
le 28 Mai 2018
Modifié(e) : meenu v
le 28 Mai 2018
2 commentaires
Image Analyst
le 28 Mai 2018
Modifié(e) : Image Analyst
le 28 Mai 2018
If you'd look in the workspace, you'd see that you never defined an x and y. Plus R, G, and B are most likely full images, not single values so you should be using single ampersands like I've told you already, or if you want the R, G, and B at a single point then you should index them or use the pq variable you created.
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