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Feature extraction not reproducible

Within a program I've written, I'm reading jpg-images using cv::imread() and extract Sift-features afterwards.

I recently updated OpenCV from version 2.4.1 to 2.4.4, but since that day, the feature extraction is not reproducible any more: The number of extracted features, feature locations and descriptors differ when executing my software multiple times (with constant input-parameters, of course)

Tests with Surf or Orb result in equal behaviour.