error in detecting components using bwlabel

2018 1 29
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更新时间：2018 1 30
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I used bwlabel for detecting connected components but i got error output i.e 3 objects are detected instead of 8. I am attaching input image. Expecting your suggestion.

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Walter Roberson
Walter Roberson 2018-1-29

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bwlabel assumes that the white pixels are where the data is and that the black pixels are holes. When you have black text on a white background you need to invert the image.

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SHOBA MOHAN
SHOBA MOHAN 2018-1-29
Thanks Walter. After using imcomplement it detects all the objects. but the output seems blurred one. How can i make exact detection of objects i am using the below code.
ImgPlate=imread('ImgPlate.jpg');
ImgPlate=im2bw(ImgPlate);
% ImgPlate=bwareaopen(ImgPlate,4);
ImgPlate=imcomplement(ImgPlate);
figure,imshow(ImgPlate);
[L,Ne]=bwlabel(ImgPlate);
for n=1:Ne
[r,c] = find(L==n);
n1=picture(min(r):max(r),min(c):max(c)); %picture command crops nth object from L
n1=imresize(n1,[42,24]); %in database size is 42,24 so it is resized so that we can match it with the database
figure,imshow(n1);
end
Walter Roberson
Walter Roberson 2018-1-29
编辑：Walter Roberson 2018-1-29
I would suggest that you do a bwclose() before doing the labeling, in order to join together sections that are close together such as the two parts of the accessibility symbol.
You are starting with a JPEG image, so you have to live with blurring. JPEG in the default lossless mode always blurs straight edges.
SHOBA MOHAN
SHOBA MOHAN 2018-1-30
Thanks Walter. I will try with your inputs.
Image Analyst
Image Analyst 2018-1-30
Or you could sum the image vertically to find the gaps between the symbols.

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