![sampleImg.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/237001/sampleImg.png)
Extracting coordinates values for the line.
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Hi,
I want to extract the coordinates for the white points along the main line where I am getting bit of noise around with additional 1 or 2 points in some columns just around the central line. I extracted the data by applying sobel filter on a displacement field and then removed some extra noisy data using bwareopen but now I am stuck with these extra points and am unable to get rid of these. Any suggestions regarding this? I have attached the displacement field matrix in .mat file.
![Annotation 2019-09-03 215357.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/236874/Annotation%202019-09-03%20215357.png)
3 个评论
Image Analyst
2019-9-5
If so, that's very easy, just threshold and scan across columns using find() on every column to find the first row with something in it.
Whoever told beginners that the first step to successful image analysis, and the easiest way to proceed, is to do edge detection, should be take out behind the woodshed and beaten. Is there a concerted effort by professors to spew this nonsense? It makes it unnecessarily hard for beginners.
采纳的回答
Akira Agata
2019-9-20
How about the following?
% Load data and convert to gray-scale image
load('v.mat');
Igray = mat2gray(v);
% Apply multilevel (N = 2) image thresholds
th = multithresh(Igray,2);
Iseg = imquantize(Igray,th);
% Extract the edge between Iseg == 1 and Iseg == 2
se = strel('disk',1);
BW1 = bwperim(Iseg == 1);
BW1 = imdilate(BW1,se);
BW2 = bwperim(Iseg == 2);
BW2 = imdilate(BW2,se);
BWedge = BW1 & BW2;
BWedge = bwmorph(BWedge,'skel',Inf);
% Show the result
figure
imshow(BWedge)
![edge.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/239037/edge.png)
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