how to connect all points in a image

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shivu kumar
shivu kumar 2017-4-9
回答： Image Analyst 2017-4-11
i am plotting the points on image, but i want to connect the all points on the image please give me code or method to connect all the points.
clc;
clear all;
close all;
X=imread('math.jpg');
imfinfo('math.jpg')
figure,imshow(X)
b = imresize(X,[100,100]);
si = size(b,1);
sj = size(b,2);
figure;imshow(b);
% Binarization
th = graythresh(b);
I = im2bw(b,th);
w = 5;
h = 5;
c=si/w;
r=sj/h;
kl=bwmorph(~I,'thin',inf);
figure,imshow(kl)
R(:,:)=kl(:,:);
I=1;
U1=w;
J=1;
U2=h;
E=1;
for i=1:r
for j=1:c
B(I:U1,J:U2)=R(I:U1,J:U2);
[x,y]=find(B==1);
CX=mean(x);
CY=mean(y);
CXX(E)=CX;
CYY(E)=CY;
T(I:U1,J:U2)=B(I:U1,J:U2);
J=J+w;
U2=U2+h;
E=E+1;
clear B x y
%CYY(isnan(CYY)) = [];
%CXX(isnan(CXX)) = [];
end
I=I+w;
U1=U1+h;
J=1;
U2=h;
end
%kl(isnan(kl(:,1)),:) = [];
imshow(R)
hold on
hold on
% plot(CYY,CXX,'.c','Markersize',8)
% hold off
r = imread('empty.jpg'); %Reading empty white blank image for plotting purpose
re = imresize(r,[100,100]);
figure,imshow(re)
% hold on
hold on
plot(CYY,CXX,'.k','Markersize',10);
hold off
help me to connect the all points on the image.
  2 个评论
shivu kumar
shivu kumar 2017-4-11
Sir please help to find the answer
input image
Image Analyst
Image Analyst 2017-4-11
All the points in each letter are already "connected". Perhaps you should just threshold and call bwlabel() to give the pixels in each letter the same class (ID) number.

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采纳的回答

Image Analyst
Image Analyst 2017-4-9
I don't know what your code does because (1) it's uncommented, (2) the indentation is messed up, and (3) it's an alphabet soup with no indication what variables like U1, U2, T, B, J, kl, etc. mean. It's unmaintainable code.
So all I can tall you is how I'd tackle the image. I'd get the distance of every point to every other point using either pdist2() (in the Stats toolbox) or a double for loop. Then for all pairs of points that are less than some predetermined distance, I'd draw a line between them. I have attached demo code for burning lines into a image.
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2017-4-9
If you already know the points you want to connect, simply see my demo where I do exactly that. Basically use imline() to create a binary image then use that as a mask to set a value in your original image.
shivu kumar
shivu kumar 2017-4-9
编辑：shivu kumar 2017-4-9
please give me some code because, now am learning matlab it will help me. and another help how minimum spanning works in matlab.
this my expected output

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更多回答（1 个）

Image Analyst
Image Analyst 2017-4-11
Regarding your new image written with a felt marker, see the attached code.

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