How to find width at certain pixel value in an image

I need to find the width at these positions in pixels although these can be found manually I need to compute this in matlab without manual intervention. I had written the code using improfile but the user needs to manually select the points and run the code three times to get the value. Kindly help me with this. Thank you in advance.

Answer 1

[Matt J]

Use the edge() command. Then, for each desired x-position, take the y-position of the 3rd edge from the top.

[Aishwarya Sanaka]

Matt, could you please elaborate. I did not understand the y-position part.

[Matt J]

In any desired column of the edge map, you just have to find the 3rd non-zero value, e.g.,

load image

edge_Image=edge(Image);

col = 190; %desired column

   nz = find(edge_Image(:,col));
width=nz(3);

imshow(edge_Image);
drawline('Position',[col 1; col width],'Color','c');

[Aishwarya Sanaka]

Appreciate your help. I understood the point clearly. Thanks again!

[Aishwarya Sanaka]

I have another doubt Matt, could you please tell me how to convert the jpg image to .mat format.I tried but the value and class is 1*1 cell and double. Please help me with this

[Image Analyst]

save('edge_Image.mat', 'edge_Image');

[Aishwarya Sanaka]

Appreciate your help, will try this. Thank you for responding.