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Encoding corrupts image!


I am using OpenCV for Face Recognition. For some reason I have to encode the face image into a string and send it to a server where the recognition part is done. However, the results are not the same as if I did the recognition directly on the taken picture.

import cv2

img = cv2.imread('/path/to/file.jpg')

recognizer.predict(img) # returns some id

#encode data
result, imgencode = cv2.imencode('.jpg', img, encode_param)
data = numpy.array(imgencode)
stringData = data.tostring()

data = numpy.fromstring(stringData, dtype='uint8')
decimg = cv2.imdecode(data,1)

recognizer.predict(decimg) # should return the same id, but does not

What could be the problem?

Thanks a lot in advance. :) Arminius