deletions | additions       diff --git a/To_detect_the_ears_we__.tex b/To_detect_the_ears_we__.tex  index e21fbe3..6547d37 100644  --- a/To_detect_the_ears_we__.tex  +++ b/To_detect_the_ears_we__.tex 
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To detect the ears, we \citet{gonzalez2014kinect}'s study, they  apply a preprocessing to the depth image just as we do to detect the nose and eyes. From the depth image, e.g. the one showed in Fig. 13(a), a depth filter is applied to remove the background and compute just the fore-ground where the user is. Fig. 13(b) shows a depth image after applying the depth filter. In this image, all the background is removed and only the face and a fraction of the torso of the user appear.\citet{gonzalez2014kinect}