MATLAB: Counting objects doesn’t hit the correct value

image analysisImage Processing Toolboximage segmentation

Hello, I need to count objects from different images, they are seem as this one: There are 3 objects, but when I do my code, it sais there are 7 objects. I have more photos, sometimes it hit the value, and other times doesn't. Any idea to correct this?

I=imread('imgPM101');
imshow(I)
I2=imadjust(I);
level=graythresh(I);
bw = im2bw (I, level);
bw =  bwareaopen (bw, 50);
bw = ~bw;
imshow(bw)
[labeled,numObjects] = bwlabel(bw,8);
numObjects

Thank you.

Best Answer

Try the attached test.m (below in blue text), which will produce the 3 blobs:

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Try this:

bw = imread('bw.png');
if ndims(bw) > 1
	bw = bw(:,:,1);
end
% Threshold
bw = bw > 128;
subplot(1, 2, 1);
imshow(bw, []);
% Fill holes
bw = imfill(bw, 'holes');
% Get areas
props = regionprops(bw, 'Area');
sortedAreas = sort([props.Area], 'descend')
% Looks like we need to throw away any blobs less than 1000 pixels or so
bw = bwareaopen(bw, 1000);
subplot(1, 2, 2);
imshow(bw);
% Count the blobs
[labeledImage, numBlobs] = bwlabel(bw);
fprintf('Found %d shapes.\n', numBlobs);

MATLAB: How to counting the number car in a image

You're simply doing a auto threshold, which most likely gives a terrible segmentation, and then basically counting all bright blobs regardless if they're a car, a reflection, a part of a car, or anything else. You can't do anything as simplistic as a global threshold. Maybe you should try stdfilt() and try to get areas that have a lot of variation in them, assuming that the road or parking lot will be smooth. Then threshold the stdfilt() image.

Best Answer

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