How to find the difference (in pixels) between two boundaries/countours?

I have this image in which I overlayed a greyscale image with its correspondent contour (green contour). I got the green contour from the morphological segmentation step. I overlayed the two contours to get visual validation on the effectiveness of my segmentation step. I want to know the difference in pixels between the greyscale contour that I will trace manualy and the green contour, so that I can know the total error of the segmentation process (in pixels)

Which tool can I use to achieve this?

Answer 1

[KALYAN ACHARJYA]

You can do number of ways: (Considering the single pixel value, as both section has same pixel value, may have small different)

1. Manually:

imtool('iamge_file_name'); 

Move the cursor, where you need the pixel value, it shows the image viewer at the bottom of the app. Note this and find the difference.

2. Authomatically: Using code (Assumed that your contours cover the mid section of the image)

    data=imread('image_file_name');
    [r c d]=size(data);
    diff_pix=data(randi(r),1)-data(round(r/2),round(c/2));

Kalyan Acharjya 😊