How do I get the coordinates of a fingerprint image?

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Klara
Klara 2014-5-16
评论： Image Analyst 2014-5-18
I have several images in which they have been located in different areas. I would like to find the coordination of where the image of fingerprint is started. Then I want to define a small window square in left top corner of the fingerprint.
Any idea?

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回答（1 个）

Image Analyst
Image Analyst 2014-5-16
If you can threshold you can look for the lowest index in the binary image. Here's one of many ways
binaryImage = grayImage < someThreshold;
[rows, columns] = find(binaryImage);
topRow = min(rows);
leftColumn = min(columns);
Another way
verticalProfile = mean(binaryImage, 2);
topRow = find(verticalProfile, 1, 'first');
horizontalProfile = mean(binaryImage, 1);
leftColumn = find(horizontalProfile, 1, 'first');
  2 个评论
Klara
Klara 2014-5-18
编辑：Klara 2014-5-18
Thanks, I segmented the image based on the variance. Therefore, foreground is area with higher variance. Then by the folowing script, I found the location of the top left corner.
% stats = regionprops(foreground,'Extrema');
top_leftX = round(stats.Extrema(1,2));
top_leftY = round(stats.Extrema(1,1));
How can I divide the image into blocks of 120x120 from that location?

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