message: [move sift.cpp] Updated internal calls to linear resize to use bit-exact version
  original commit:
diff: @@ -162,7 +162,8 @@ static const float SIFT_DESCR_MAG_THR = 0.2f;
  // factor used to convert floating-point descriptor to unsigned char
  static const float SIFT_INT_DESCR_FCTR = 512.f;
  -#if 0
  +#define DoG_TYPE_SHORT 0
  +#if DoG_TYPE_SHORT
  // intermediate type used for DoG pyramids
  typedef short sift_wt;
  static const int SIFT_FIXPT_SCALE = 48;
  @@ -198,7 +199,11 @@ static Mat createInitialImage( const Mat& img, bool doubleImageSize, float sigma
  {
  sig_diff = sqrtf( std::max(sigma * sigma - SIFT_INIT_SIGMA * SIFT_INIT_SIGMA * 4, 0.01f) );
  Mat dbl;
  +#if DoG_TYPE_SHORT
  + resize(gray_fpt, dbl, Size(gray_fpt.cols*2, gray_fpt.rows*2), 0, 0, INTER_LINEAR_EXACT);
  +#else
  resize(gray_fpt, dbl, Size(gray_fpt.cols*2, gray_fpt.rows*2), 0, 0, INTER_LINEAR);
  +#endif
  GaussianBlur(dbl, dbl, Size(), sig_diff, sig_diff);
  return dbl;
  }
  