MATLAB: I have RGB (MxNx3) image and a binary mask (MxN). I want to place this mask over the RGB such that a line should be shown along the shape of the mask on the RGB image.

Question

The output should be some what like this

Answer 1

Call bwboundaries() then plot

boundaries = bwboundaries(binaryImage);
numberOfBoundaries = size(boundaries, 1);
hold on;
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'r-', 'LineWidth', 2);
end
hold off;