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try adding your descriptors directly to your BOW:

gray = cv2.cvtColor(image, cv2.CV_LOAD_IMAGE_GRAYSCALE)
kp, dsc= sift.detectAndCompute(gray, None)
BOW.add(dsc)

try adding your descriptors directly to your BOW:

gray = cv2.cvtColor(image, cv2.CV_LOAD_IMAGE_GRAYSCALE)
kp, dsc= sift.detectAndCompute(gray, None)
BOW.add(dsc)

## later:
dictionary = BOW.cluster()