Hey @Tai Pham
It seems that the issue is related to the input image. The “activecontour” function in MATLAB expects a 2D grayscale image.
To convert an image to grayscale you can use “rgb2gray” function as follows:
gray_img = rgb2gray(img); %now you get 2D grayscale image
% input the “gray_img” to "activecontour" function
For more details on using “activecontour” function, kindly refer the MATLAB example on “Segmenting Image Using Active Contours with Interactive Mask” by running the following command:
openExample('images/SegmentImageOverlayingMaskAndContourOnOriginalImageExample');
I hope this helps you!
