1 files changed, 8 insertions, 3 deletions
diff --git a/meowpp/gra/FeaturePointsDetector_Harris.h b/meowpp/gra/FeaturePointsDetector_Harris.h
index e7c6b91..8f0f8fe 100644
--- a/meowpp/gra/FeaturePointsDetector_Harris.h
+++ b/meowpp/gra/FeaturePointsDetector_Harris.h
@@ -16,7 +16,7 @@
 namespace meow {
 
 /*!
- * @brief Harris corner detect
+ * @brief Harris-Corner-Detect algorithm for finding feature points.
  *
  * @author cat_leopard
  */
@@ -190,10 +190,12 @@ public:
     Ixx.gaussianed(self->sizeW_, self->sizeW_);
     Iyy.gaussianed(self->sizeW_, self->sizeW_);
     Ixy.gaussianed(self->sizeW_, self->sizeW_);
+    input_gx.clear();
+    input_gy.clear();
 
     // filter too flat or on edge
-    Bitmap<double>  R(input.height(), input.width(),   0.0);
-    Bitmap<bool> good(input.height(), input.width(), false);
+    Bitmap<double>    R(input.height(), input.width(),   0.0);
+    Bitmap<bool>   good(input.height(), input.width(), false);
     ssize_t b = self->boundB_;
     for (ssize_t y = b, Y = -b + input.height(); y < Y; y++) {
       for (ssize_t x = b, X = -b + input.width(); x < X; x++) {
@@ -204,6 +206,9 @@ public:
         good.pixel(y, x, (r >= self->thresholdR_));
       }
     }
+    Ixx.clear();
+    Iyy.clear();
+    Ixy.clear();
 
     // find union neighbor
     DisjointSet dsj(input.size());