crop objects from color image and still have color objects

Hello,

I know how to crop an object from a binary image. But how to do it from a color image to get a color final image around the object.

Thnak you,

Answer 1

[mariem farhat]

Ok, I find it!

RGB=imread(I);
%%Convert to gray scale
  Gray=rgb2gray(RGB);
%%Convert to binary image
threshold = graythresh(Gray);
imagen =~im2bw(Gray,threshold);
%%Remove all object containing fewer than 30 pixels
imagen = bwareaopen(imagen,30);
%%Label connected components
[L Ne]=bwlabel(imagen);
%%Measure properties of image regions
propied=regionprops(L,'BoundingBox','Area');
% %%Objects extraction
for n=1:Ne
  if(propied(n).Area>1000)

        [r,c] = find(L==n);
        switch (type)
            case 'RGB'
            %%get the image of the object 
               s_I=size(RGB);
               s = size(r);
               n1(:,:,1) = zeros(s_I(1),s_I(2));
               n1(:,:,2) = zeros(s_I(1),s_I(2));
               n1(:,:,3) = zeros(s_I(1),s_I(2));

                n1 (:,:,1) =255;
                n1 (:,:,2) = 255;
                n1 (:,:,3) = 255;

               for i=1:s
                   n1(r(i),c(i),1)=RGB(r(i),c(i),1);
                   n1(r(i),c(i),2)=RGB(r(i),c(i),2);
                   n1(r(i),c(i),3)=RGB(r(i),c(i),3);

               end;
               n1 = uint8(n1);
               % get the croped object from the image
               R = n1(min(r):max(r),min(c):max(c),1);
               G = n1(min(r):max(r),min(c):max(c),2);
               B = n1(min(r):max(r),min(c):max(c),3);
               n2 = cat(3,R,G,B);
               n2 = uint8(n2);

that is it! Hope it will help someone.

Answer 2

[Abdullah Sarwar]

clear all;

clc;

rgbImage = imread('04738.bmp');

% Extract color channels.

redChannel = rgbImage(:,:,1); % Red channel

greenChannel = rgbImage(:,:,2); % Green channel

blueChannel = rgbImage(:,:,3); % Blue channel

size_img=size(rgbImage);%size of img

minval=min(size_img(1:2));%min value of size matrix

if minval<128% crop dimentions

i=64

elseif minval<256

i=128

elseif minval<512

i=256

elseif minval<1024

i=512

elseif minval<2048

i=1024

end

x=redChannel(1:i,1:i);%crop red

y=greenChannel(1:i,1:i);%crop green

z=blueChannel(1:i,1:i);%crop blue

recombinedRGBImage = cat(3, x, y, z);%recombine all planes

% Display them all.

subplot(1,2,1);

imshow(rgbImage);

subplot(1,2,2);

imshow(recombinedRGBImage);

title('Recombined to Form Original RGB Image Again')

%% please make changes according to your need