tracker/pt: don't allocate temporary dynamic size arrays

2 files changed, 5 insertions, 6 deletions

diff --git a/tracker-pt/point_extractor.cpp b/tracker-pt/point_extractor.cpp
index 3808c408..655e1412 100644
--- a/tracker-pt/point_extractor.cpp
+++ b/tracker-pt/point_extractor.cpp
@@ -29,7 +29,6 @@ const std::vector<cv::Vec2f>& PointExtractor::extract_points(cv::Mat& frame)
     }
 
     // convert to grayscale
-    cv::Mat frame_gray;
     cv::cvtColor(frame, frame_gray, cv::COLOR_RGB2GRAY);
 
     const double region_size_min = s.min_point_size;
@@ -61,14 +60,11 @@ const std::vector<cv::Vec2f>& PointExtractor::extract_points(cv::Mat& frame)
     const int thres = s.threshold;
     if (!s.auto_threshold)
     {
-        cv::Mat frame_bin;
         cv::threshold(frame_gray, frame_bin, thres, 255, cv::THRESH_BINARY);
         cv::findContours(frame_bin, contours, CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
     }
     else
     {
-        cv::Mat hist;
-        constexpr int hist_c = 8;
         cv::calcHist(std::vector<cv::Mat> { frame_gray },
                      std::vector<int> { 0 },
                      cv::Mat(),
@@ -76,7 +72,7 @@ const std::vector<cv::Vec2f>& PointExtractor::extract_points(cv::Mat& frame)
                      std::vector<int> { 256/hist_c },
                      std::vector<float> { 0, 256/hist_c },
                      false);
-        const int sz = hist.rows*hist.cols;
+        const int sz = hist.cols * hist.rows;
         int val = 0;
         int cnt = 0;
         constexpr int min_pixels = 250;
@@ -95,7 +91,6 @@ const std::vector<cv::Vec2f>& PointExtractor::extract_points(cv::Mat& frame)
         val *= 240./256.;
         //qDebug() << "val" << val;
 
-        cv::Mat frame_bin;
         cv::threshold(frame_gray, frame_bin, val, 255, CV_THRESH_BINARY);
         cv::findContours(frame_bin, contours, CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
     }
diff --git a/tracker-pt/point_extractor.h b/tracker-pt/point_extractor.h
index 979cc8b6..ad8955fc 100644
--- a/tracker-pt/point_extractor.h
+++ b/tracker-pt/point_extractor.h
@@ -27,8 +27,12 @@ public:
     
     settings_pt s;
 private:
+    enum { hist_c = 8 };
     std::vector<cv::Vec2f> points;
     QMutex mtx;
+    cv::Mat frame_gray;
+    cv::Mat frame_bin;
+    cv::Mat hist;
 };
 
 #endif //POINTEXTRACTOR_H