Cannot Use activecontour function

Hi Everyone,

I got a problem when I was learning how to use activecontour function in matlab. I met an error as following:

I also tried using the image in the example but the error still persists.

Please help me solve this problem.

Thanks and Best Regards, Tai Pham

Answer 1

[Sourabh]

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!