how to split image and fill different color

Question

As this picture, how to use matlab code to split it into different parts, and then fill color in it? In addition, how to set gradient color in the second code ??? Here is the picture segmentation code: ``` clc rgb=imread('sample1.bmp'); bw=im2bw(rgb2gray(rgb),.8); bw=medfilt2(bw); planes=bwareaopen(bw,800); D=mat2gray(bwdist(imcomplement(planes))); stats=regionprops(D>.8,'Centroid'); planes_centroid=cat(1,stats.Centroid); planes_mask=false(size(bw)); planes_mask(sub2ind(size(bw),round(planes_centroid(:,2)),... round(planes_centroid(:,1))))=1; M=imimposemin(imcomplement(D),planes_mask); L=watershed(M); r=L & planes; stats=regionprops(r,'BoundingBox','Centroid') bb=cat(1,stats.BoundingBox); c=cat(1,stats.Centroid); figure,imshow(planes) hold on for i=1:length(stats) rectangle('Position',bb(i,:),'EdgeColor','b') plot(c(i,1),c(i,2),'r*') text(c(i,1)-5,c(i,2)-10,num2str(i)) end %second code clc;clf;close all;clear all; color=cell(4,1); for i=1:4 input=imread(['heartspline2_4_',num2str(i)],…

Accepted Answer

You can use `bwlabel` to assign different index to each image region:

```
img = imread('https://i.stack.imgur.com/F1Iya.jpg');  %// read image
bw = img(:,:,1) > 128;  %// convert to binary mask
lb = bwlabel(bw,4);  %// extract distinct regions
```

The result:

```
figure; imshow(lb, [], 'border', 'tight'); colormap(rand(256,3));
```

If you want a gradient effect to the colors, you can

```
[x y] = meshgrid(linspace(0,1,size(bw,2)), linspace(0,1,size(bw,1)));
rand('seed',543310);
rgb_lb = ind2rgb(lb, rand(max(lb(:)+1),3)); %// convert to RGB color image
gx = x; 
gx(lb==1)=1;  %// use the horizontal gradient
gx = gx./max(gx(:));
```

Apply the gradient:

```
rgb_lb = bsxfun(@times, rgb_lb, gx);
```

The result:

how to split image and fill different color

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