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 for（i=0;i<3;i++）
for(j=0;j<3;j++) 
 
{
Mat dictionary;
Mat cfile=("lema.jpg", CV_LOAD_IMAGE_GRAYSCALE)
float f=0;
float ID=0;
float * value = new float[2];
FileStorage fs("dictionary_k2000.yml", FileStorage::READ);
fs["vocabulary"] >> dictionary;
fs.release();
Ptr<descriptormatcher> Ptr<DescriptorMatcher> matcher(new FlannBasedMatcher);
Ptr<featuredetector> Ptr<FeatureDetector> detector(new SiftFeatureDetector());
Ptr<descriptorextractor> Ptr<DescriptorExtractor> extractor(new SiftDescriptorExtractor);
BOWImgDescriptorExtractor bowDE(extractor,matcher);
bowDE.setVocabulary(dictionary);
vector<keypoint> vector<KeyPoint> keyPoints;
detector->detect(cfile, keyPoints );
Mat imageDescriptor;
bowDE.compute( cfile, keyPoints, imageDescriptor ); 
  }
}

the imageDescriptor gotten in each loop is different, two parameters of bowDE.compute "cfile" and "keyPoints" are the same , why ? how to solve this problem