Can someone explain me the following segmentation code for number plates ? what technique is applied here ?

 stats = regionprops(img3); %segmentation
     S = ' ';
for index=1:length(stats)
if stats(index).Area > 200 && stats(index).BoundingBox(3)*stats(index).BoundingBox(4) < 30000
      x = ceil(stats(index).BoundingBox(1));
      y= ceil(stats(index).BoundingBox(2));
      widthX = floor(stats(index).BoundingBox(3)-1);
      widthY = floor(stats(index).BoundingBox(4)-1);
      subimage(index) = {img3(y:y+widthY,x:x+widthX,:)};

Answer 1

[Walter Roberson]

It is just looking for connected blobs with area between 200 and 30000.

[Tafheem Ahmed]

can you please explain it a bit more detail ? :) i would like to implement this and try to improve on it

[Image Analyst]

It looks at the area of each blob, stats(index).Area, and if the area is between 200 and 30000, it extracts the bounding box of that blob out into its own image and then places that extracted image into one cell of a cell array called subimage.

See the FAQ: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

And see my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[Tafheem Ahmed]

thankyou :)