Merge pull request #19 from biometrics/transforms

Added DownsampleTransform

Merge pull request #19 from biometrics/transforms
Added DownsampleTransform
jklontz
2 parents 44cdf3bb a12c0111
Showing 2 changed files with 14 additions and 2 deletions
sdk/plugins/reduce.cpp
share/openbr/openbr.bib
@@ -122,6 +122,7 @@ BR_REGISTER(Transform, StatTransform)
 /*!
  * \ingroup transforms
  * \brief Downsample the rows and columns of a matrix.
+ * \author Lacey Best-Rowden \cite lbestrowden
  */
 class DownsampleTransform : public UntrainableTransform
 {
@@ -131,9 +132,15 @@ class DownsampleTransform : public UntrainableTransform
     void project(const Template &src, Template &dst) const
     {
+        if (src.m().channels() != 1)
+            qFatal("Expected 1 channel matrix.");
         Mat input = src.m();
-        Mat output;
-        (void) input; // TODO: write me!
+        Mat output(ceil((double)input.rows/k), ceil((double)input.cols/k), CV_32FC1);
+        for (int r=0; r<output.rows; r++) {
+            for (int c=0; c<output.cols; c++) {
+                output.at<float>(r,c) = input.at<float>(r*k,c*k);
+            }
+        }
         dst.m() = output;
     }
 };
@@ -28,6 +28,11 @@
 	Author = {Charles A. Otto},
 	Howpublished = {https://github.com/caotto},
 	Title = {ottochar at gmail.com}}
+
+@misc{lbestrowden,
+	Author = {Lacey S. Best-Rowden},
+	Howpublished = {https://github.com/lbestrowden},
+	Title = {bestrow1 at msu.edu}}
 % Software