def my_handler(proc, image, closure):
# print "handler invoked"
global previous
# meta={"symbols":[{"location":copy(s.location), "data":copy(s.data)} for s in image.symbols]}
# if meta['symbols'][0]['data']==previous:
# return
# previous=meta['symbols'][0]['data']
global lastPage
page=Page()
lastPage=page
# print "New page object"
pilImage=Image.fromstring("RGB",image.size,image.data).convert('L')
# print "make pilImage"
page.pilImage=pilImage
# print "set page.pilImage"
# page.pilImage.show()
page.symbols=image.symbols
# print "page.symbols="
page.read_grade_marks()
