Changing division to multiplication, a decent speedup.

2026-05-16 12:17:57 +00:00 · 2017-09-30 11:33:15 +01:00
parent bf7ab4f309
commit ea4a0feb3a
1 changed files with 4 additions and 1 deletions
--- a/lib/local/LandmarkDetector/src/CEN_patch_expert.cpp
+++ b/lib/local/LandmarkDetector/src/CEN_patch_expert.cpp
@@ -367,9 +367,12 @@ void im2colBiasSparseContrastNorm(const cv::Mat_<float>& input, int width, int h
 				norm = 1;
 			}

+			// Flip multiplication to division for speed
+			norm = 1.0 / norm;
+
 			for (size_t x = 1; x < width*height + 1; ++x)
 			{
-				Mo[x] /= norm;
+				Mo[x] *= norm;
 			}

 			rowIdx++;