How may I change certain areas of a geometry (specified by point point) with reference to a geometry?

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Ajay Goyal 2022-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/1622310-how-may-i-change-certain-areas-of-a-geometry-specified-by-point-point-with-reference-to-a-geometry

评论： yanqi liu 2022-1-8

Picture1.png

I have two pointclouds containing x,y,z cordinates of two similar geometry. Say A and B. A is suppose a square of size 1mm by 1mm. B is also a square of size 0.5mm by 0.5mm. However, in B one edge is distorted (see attached figure). Now I wish to correct it, which means, change it to sqaure of size 0.5mm by 0.5mm. Is there a way to do it?

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yanqi liu 2022-1-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1622310-how-may-i-change-certain-areas-of-a-geometry-specified-by-point-point-with-reference-to-a-geometry#answer_868145

在 MATLAB Online 中打开

clc; clear all; close all;

[X,map,alpha] = imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/852940/Picture1.png');

figure; imshow(alpha);

bw = im2bw(alpha);

bw = bwareaopen(imfill(bw, 'holes'), 1000);

bw2 = bwareafilt(bw, 2);

bw(bw2) = 0;

[r,c] = find(bw);

bw(min(r):max(r),min(c):max(c)) = 1;

bw = logical(bw);

be = imdilate(bwperim(bw), strel('disk', 3));

alpha(be) = 255;

figure; imshow(be);

figure; imshow(alpha);

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yanqi liu 2022-1-7

在 MATLAB Online 中打开

yes，sir，may be make relation between them，such as

clc; clear all; close all;

[X,map,alpha] = imread('https://ww2.mathworks.cn/matlabcentral/answers/uploaded_files/855030/Picture1.png');

figure; imshow(alpha);

bw = im2bw(alpha);

bw2 = bwareaopen(imfill(bw, 'holes'), 1000);

bw2 = bwareafilt(bw2, 2);

bw3 = bw;

bw3(bw2) = 0;

bw4 = bw;

bw4(~bw2) = 0;

[L,num] = bwlabel(bw4);

statsp = regionprops(L);

areap = cat(1,statsp.Area);

[~,id] = sort(areap, 'descend');

bw4a = L == id(1);

bw4b = L == id(2);

cen1 = statsp(id(1)).Centroid;

cen2 = statsp(id(2)).Centroid;

ts = round(cen1-cen2);

bw4b2 = imtranslate(bw4b,ts);

bw4ab = logical(bw4a+bw4b2);

% locate every number

[r, c] = find(bw4);

stats = regionprops(bw3);

pts1 = [];

pts2 = [];

for i = 1 : length(stats)

ceni = stats(i).Centroid;

disi = pdist2(ceni, [c, r]);

[~,ind] = min(disi);

hold on;

plot([ceni(1) c(ind)], [ceni(2) r(ind)], 'r-', 'LineWidth', 2);

if bw4a(r(ind), c(ind))

pts1 = [pts1; c(ind) r(ind)];

end

if bw4b(r(ind), c(ind))

pts2 = [pts2; c(ind) r(ind)];

end

% compute

pts3 = pts2;

pts3(:,1) = pts3(:,1)+ts(1);

pts3(:,2) = pts3(:,2)+ts(2);

figure; imshow(bw4ab);

hold on;

plot(pts1(:,1), pts1(:,2), 'm*');

plot(pts3(:,1), pts3(:,2), 'ro');

% get relation

relation = [];

for i = 1 : size(pts3,1)

disi = pdist2(pts1, pts3(i,:));

[~,ind] = min(disi);

relation = [relation; i, ind];

plot([pts3(i,1) pts1(ind,1)], [pts3(i,2) pts1(ind,2)], 'r-', 'LineWidth', 2);

end

figure; imshow(alpha);

hold on;

for i = 1 : size(relation, 1)

plot([pts1(relation(i, 2), 1) pts2(relation(i, 1), 1)], [pts1(relation(i, 2), 2) pts2(relation(i, 1), 2)], 'm-', 'LineWidth', 2);

end

now，we can get the point relation

Ajay Goyal 2022-1-7

Thank you very much my friend. It will solve the purpose. I am home quarantined since yesterday and will try to study it on Monday, if report is in my favor :). Take care Regards, Dr. Ajay

yanqi liu 2022-1-8

it is my pleasure，in thie question，we use the loop iteration for compute，and choose the best result. of course，may be use some parameter to adjust

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