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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Accepted Answer
Image Analyst
on 19 May 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.
3 Comments
Image Analyst
on 27 May 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.
More Answers (2)
Jan
on 19 May 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
on 28 May 2018
Edited: meenu v
on 28 May 2018
2 Comments
Image Analyst
on 28 May 2018
Edited: Image Analyst
on 28 May 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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