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The callback is never accessed. Change

self.sub = rospy.Subscriber('/camera/depth/image_rect_raw',Image,callback)

to

self.sub = rospy.Subscriber('/camera/depth/image_rect_raw', Image, self.callback)

Some additional comments:

If you just want to view images, use rqt_image_view instead
use ROS logging instead of prints, that way you can use all the tools associated with it
consider using a linter, I see several PEP8 violations ;)

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