find 8 neighbours in image

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Sajid Rahim
Sajid Rahim el 21 de Sept. de 2017
Respondida: Mehadi Hasan el 22 de Oct. de 2021
hi dears..... plz help me
how i find the 8 neighbours around the white pixels...
  3 comentarios
RASHMI CHINNAPPA
RASHMI CHINNAPPA el 4 de Jul. de 2020
how to find the 8 neighbours around a single white region
Image Analyst
Image Analyst el 4 de Jul. de 2020
Use imdilate() then and it with the original
neighbors = imdilate(bw, true(3)) & ~bw;

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Respuestas (2)

KSSV
KSSV el 21 de Sept. de 2017
Read about knnsearch
I = imread('2.png') ;
I = rgb2gray(I) ;
[y,x] = find(I) ;
% 8 nearest neighbors
[ny,nx] = size(I) ;
[X,Y] = meshgrid(1:nx,1:ny) ;
% global indices
idx = knnsearch([X(:) Y(:)],[x,y],'k',8) ;
% sub indices
[i,j] = ind2sub(size(I),idx) ;
  2 comentarios
Sajid Rahim
Sajid Rahim el 16 de Oct. de 2017
Editada: Walter Roberson el 17 de Oct. de 2017
clear all;
[filename
pathname]=uigetfile('*.jpg;*.png;*.tif;*.tiff;*.gif;*.bmp;');
inputimage=imread([pathname filename]);
I=inputimage;
% I = imread('5.png') ;
I = rgb2gray(I) ;
[y,x] = find(I) ;
figure
imshow(I)
hold on
plot(x,y,'.b')
% x
% y
% z=(y+x)/2
% plot(z,'.r')
a=x(1)
b=y(1)
plot(x(1),y(1),'*y')
plot(x(end),y(end),'*y')
% neighbors(1) = (a,b-1);
neighbors(1) = I(a,b-1);
plot(a,b-1,'*r')
neighbors(2) = I(a,b+1);
plot(a,b+1,'*r')
neighbors(3) = I(a,b+2);
plot(a,b+2,'*r')
neighbors(4) = I(a+1,b);
plot(a+1,b,'*r')
neighbors(5) = I(a+1,b+1);
plot(a+1,b+1,'*r')
neighbors(6) = I(a+2,b+2);
plot(a+2,b+2,'*r')
neighbors(7) = I(a+2,b);
plot(a+2,b,'*r')
neighbors(8) = I(a+2,b+1);
plot(a+2,b+1,'*r')
neighbors(9) = I(a+2,b+2);
plot(a+2,b+2,'*r')
this is my code i done it
but now i wana to find each 8 neighbers of every finded neibgher
Walter Roberson
Walter Roberson el 17 de Oct. de 2017
This code does not answer the questions "Find them in what sense? What output are you looking for?"

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Mehadi Hasan
Mehadi Hasan el 22 de Oct. de 2021
I = imread('2.png') ;
I = rgb2gray(I) ;
[y,x] = find(I) ;
% 8 nearest neighbors
[ny,nx] = size(I) ;
[X,Y] = meshgrid(1:1x,1:1y) ;
% global indices
idx = knnsearch([X(:1) Y(:1)],[x,y],'k',8) ;
% sub indices
[i,j] = ind2sub(size(I),idx) ;

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