How can i detect blacked spots?

How can I detect Blacked Spots in banana, Because my boundingbox is not detect where is blacked area

Answer 1

[Allan III T. Condiman]

I want to detect this spots in this picture below and not detect the spots the top and bottom of the banana?

a variable is picture

This is my code below:

grayImage = a;

[rows, columns, numberOfColorChannels] = size(grayImage);

if numberOfColorChannels > 1

grayImage = rgb2gray(grayImage);

end

binaryImage = grayImage == 0;

binaryImage = imclearborder(binaryImage);

[labeledImage, numBlobs] = bwlabel(binaryImage);

coloredLabels = label2rgb (labeledImage, 'hsv', 'k', 'shuffle');

props = regionprops(labeledImage, 'BoundingBox', 'Centroid');

imshow(picture);

hold on;

for k = 1 : numBlobs

bb = props(k).BoundingBox;

bc = props(k).Centroid;

rectangle('Position',bb,'EdgeColor','c','LineWidth',2);

end

drawnow limitrate;