Convert binary image to a line plot

I have a image with the contours of an object I'm analyzing, this image is a binary image where it shows the contours of the object as white and the rest as black. And I have the object mesh.

What I'm trying to do is overlay the contour image, as a line plot, on the mesh plot so i can see where are the limits of the mesh and remove the excess mesh.

Answer 1

[Image Analyst]

Your mesh doesn't have the same x and y limits/ranges as the binary image so you might have to scale it, but it's basically like this

[y, x] = find(binaryImage); % Note: it's [y, x], NOT [x, y], because it's really [row, column].
hold on
plot(x, y, 'k.', 'MarkerSize', 20) % Adjust markersize to what you want.

[Bruno Neto]

It worked but now both images don't match. My binary image is way bigger than the mesh, besides, I have some negatives coordinates on the mesh and none on the binary image. I'm still not able to match them.

My mesh image is apparently inside the red box i draw

[Bruno Neto]

I finally could match the contours with the mesh but i still have the contours as points at not as a line. Is there anyway to connect the point to convert it to a line? So i can create a region inside the contours

[Bruno Neto]

[Image Analyst]

Why do you want a mesh anyway?

How did you get your binary image? Why is it not one pixel wide? Did you not use bwperim or bwboundaries?

I don't know what this means: "but i still have the contours as points at not as a line"? I think of contours like isolevels, like curves at a particular elevation/altitude for a topographic map, or iso-gray level lines on a gray scale image. That is your definition of contour, and why do you expect it to be a line? If you want the list of (x,y) coordinates for the perimeter of the binary image to be in an oder where all the points are adjacent, then use bwboundaries.

[Bruno Neto]

I got my binary image using Edge command. And I need those as a line so I can remove the excess mesh (red in image)