Locate points inside region based on coordinates

Hi guys, MATLAB rookie here. I have a matrix of points distribution coordinates and binary image of a structure. What I want to do is to select the points that located inside the structure of the binary image and extract those points. I read about using "&" but clearly it didn't work when I try it. Could you guys share some insights?

Answer 1

[KSSV]

doc inpolygon.

[Jason States]

Thanks a lot!

Answer 2

[Image Analyst]

You need to turn your (x,y) points into a binary image first. THEN you can use & and find() after that if you want to:

pointsImage = false(size(binaryImage));
for k = 1 : length(x)
    thisRow = round(y(k));
    thisCol = round(x(k));
    pointsImage(thisRow, thisCol) = true;
end
% Find intersection.
%  This will be an image of only the points inside blobs in binaryImage.
pointsInside = binaryImage & pointsImage;
% Find rows and columns of points inside
[rows, columns] = find(pointsInside); % or [y, x] = find(pointsInside);