what is wrong with my code
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1-Write the program that determines the number of balloons in the picture below and the green rectangle around each balloon in the picture.
Bal=imread('ballons.jpg');
B=Bal(:,:,3);
d1x = [1 0 -1];
d1y = [1;0-1];
Bx = conv2(B,d1x,'same');
By = conv2(B,d1y,'same');
J = sqrt((Bx.^2)+(By.^2));
K = J>25;
L = imclearborder(K);
K=edge(K, 'Canny');
M = imfill(L,'holes');
N = bwareaopen(M,350);
figure, imshow(Bal);
stats = regionprops(N, 'BoundingBox', 'Centroid');
hold on;
for object = 1:length(stats)
bb = stats(object).BoundingBox;
bc = stats(object).Centroid;
rectangle('Position',bb,'EdgeColor','g','LineWidth',2)
plot(bc(1),bc(2), '')
end
hold off
area = sum(sum(N))
O = bwmorph(N,'remove');
perimeter = sum(sum(O))
[B,L] = bwboundaries(N,'noholes');
hold on
[row,col] = find(N==1);
[a,b] = size(N);
mask = false(a,b);
mask(min(row):max(row),min(col):max(col)) = 1;
mask = bwperim(mask,8);
mask = imdilate(mask,strel('square',4));
R = Bal(:,:,1);
G = Bal(:,:,2);
B = Bal(:,:,3);
R(mask) = 255;
G(mask) = 255;
B(mask) = 0;
RGB = cat(3,R,G,B);
hsv=rgb2hsv(Bal);
v=hsv(:,:,3);
range=[50 600]/750;
mask=(v>range(1)) & (v<range(2));
mask=imcomplement(mask);
se=strel('disk',2);
mask=imerode(mask,se);
mask=bwareaopen(mask,20);
[info, total]=bwlabel(mask);
mrk=regionprops(mask,'centroid');
XY=cat(1,mrk.Centroid);
hold on;
title(['All balons numbers : ',num2str(total)]);
B= double(rgb2gray(Bal));
d1x = [-1 0 1];
d1y = [-1;0;1];
Bx = conv2(B,d1x,'same');
By = conv2(B,d1y,'same');
J = sqrt((Bx.^2)+(By.^2));
K = J>50;
L = imclearborder(K);
M = imfill(L,'holes');
N = bwareaopen(M,6000);
[row,col] = find(N==1);
3 Comments
Accepted Answer
Image Analyst
on 17 Jun 2021
I'd start by using the Color Thresholder in HSV space to find green, then mask out the grass. Then I'd convert to HSV color space and look for blobs that have high S value. Use imclose() on the mask to merge together blobs that are not quite touching though they should be. Use bwareafilt() to get only those in a certain size range. Then call regionprops(mask, 'BoundingBox') and finally put in a loop where you call rectangle().
Attach your code if you need any more help.
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