Hello everyone.I would like to ask you how to extract the data of a local area of a picture. The code I wrote is shown below. Please help me correct the mistakes. Thank you all.

Question

Wesley 2021-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/834678-hello-everyone-i-would-like-to-ask-you-how-to-extract-the-data-of-a-local-area-of-a-picture-the-cod

评论： Wesley 2021-5-20

BW21=imread('m1.jpg');

% stats = regionprops(BW21,'Area','Centroid');%binaryImage

%

% %props = regionprops(BW21, 'Perimeter');%binaryImage

[labeledImage, numRegions] = bwlabel(BW21);%binaryImage

props = regionprops(labeledImage, 'Area','Centroid','Perimeter');

% Compute all the areas.

allAreas = [props.Area];

% Display each blob in its own figure.

for k = 1 : numRegions

thisRegion = ismember(labeledImage, k);

figure;

imshow(thisRegion);

drawnow;

end

%%%Data extraction of the first region on the image

data=imbinarize(BW21);%'image.jpeg'

result=edge(data);

figure,imshow(result);

[r,c]=find(result==1);

figure,plot(c,r,'.');

%%%Data extraction for the first area

for i=1:1:912

for j=1:1:1312

if BW31(i,j)~=1

BW31(i,j)=0;

end

x = linspace(1,912,912)';

y = linspace(1,1312,1312)';

contourf(y, x, BW31 ,20);

colorbar;

xlabel('x');

ylabel('y');

axis equal

data=imbinarize(BW31);%'image.jpeg'

result=edge(data);

figure,imshow(result);

[r,c]=find(result==1);

figure,plot(c,r,'.');

%

% Data extraction for the second area

%

BW32=bwlabel(BW21);

for i1=1:1:912

for j1=1:1:1312

if BW32(i1,j1)~=1

BW32(i1,j1)=0;

end

x1= linspace(2,912,912)';

y1 = linspace(2,1312,1312)';

contourf(y1, x1, BW32 ,20);

colorbar;

xlabel('x1');

ylabel('y1');

axis equal

data1=imbinarize(BW32);%'image.jpeg'

result1=edge(data1);

figure,imshow(result1);

[r1,c1]=find(result1==1);

figure,plot(c1,r1,'.');

...

%

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Answer 1

Sulaymon Eshkabilov 2021-5-20

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Is that what you are trying to get?

D = imread('BW.jpeg');
MYdata=imbinarize(D);
figure(1)
imshow(MYdata);
R=edge(MYdata);
figure,imshow(R);
[Edge,C]=find(R==1);
figure(2)
plot(C,Edge,'k.'), title('Separated local area pictures')

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Wesley 2021-5-20

Thank you very much for your kind reply. My idea is to extract the data from the first area. The second, the third, and the area behind it don't matter. I'd like to ask you this question. Thank you very much.

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Answer 2

Sulaymon Eshkabilov 2021-5-20

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Maybe here you can find some good help:

https://www.mathworks.com/matlabcentral/answers/76528-measurement-in-images-image-analysis?s_tid=srchtitle

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Wesley 2021-5-20

OK, thank you for your help.

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Answer 3

Image Analyst 2021-5-20

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You say "My idea is to extract the data from the first area. The second, the third, and the area behind it don't matter." By "area" I assume you mean "region". I have no idea what "data" means. You can get the area, the cropped region, individual uncropped blobs using ismember(), and lots of other stuff from regionprops().

But you have

% Compute all the areas.
allAreas = [props.Area];

so you're getting all the areas of all the blobs, if "area" is what you meant by "data". Otherwise, explain what "data" means to you. And define what you mean by "first" since blobs have varying size and are at verying locations.

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Wesley 2021-5-20

Thank you very much for your reply. In this way, the extracted coordinate data is in one block. I want to extract the coordinates of the edge curve of a single small area. For example, like the picture I sent below, the data of such a small area is saved individually. Thank you very much for your help.