From 82ca9e11965bce800ed5d500ab9c7dbc9ac3aa77 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 2 Jun 2022 22:42:29 +0800
Subject: import(life): ...

---
 .../life/digital-image-process-lab/CMakeLists.txt  |  3 ++
 .../HarrisCornerDetector.cpp                       | 49 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 works/life/digital-image-process-lab/HarrisCornerDetector.cpp

(limited to 'works/life')

diff --git a/works/life/digital-image-process-lab/CMakeLists.txt b/works/life/digital-image-process-lab/CMakeLists.txt
index 5c2d05b..8a00ca5 100644
--- a/works/life/digital-image-process-lab/CMakeLists.txt
+++ b/works/life/digital-image-process-lab/CMakeLists.txt
@@ -15,3 +15,6 @@ target_link_libraries(DiscreteFourierTransform ${OpenCV_LIBS})
 
 add_executable(MorphologicalTransformation MorphologicalTransformation.cpp)
 target_link_libraries(MorphologicalTransformation ${OpenCV_LIBS})
+
+add_executable(HarrisCornerDetector HarrisCornerDetector.cpp)
+target_link_libraries(HarrisCornerDetector ${OpenCV_LIBS})
diff --git a/works/life/digital-image-process-lab/HarrisCornerDetector.cpp b/works/life/digital-image-process-lab/HarrisCornerDetector.cpp
new file mode 100644
index 0000000..c7013be
--- /dev/null
+++ b/works/life/digital-image-process-lab/HarrisCornerDetector.cpp
@@ -0,0 +1,49 @@
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+
+#include <iostream>
+
+cv::Mat src, src_gray;
+int thresh = 100;
+int max_thresh = 255;
+const char *source_window = "Source image";
+const char *corners_window = "Corners detected";
+void cornerHarris_demo(int, void *);
+int main(int argc, char **argv) {
+  cv::CommandLineParser parser(argc, argv,
+                               "{@input | building.jpg | input image}");
+  src = cv::imread(cv::samples::findFile(parser.get<cv::String>("@input")));
+  if (src.empty()) {
+    std::cout << "Could not open or find the image!\n" << std::endl;
+    std::cout << "Usage: " << argv[0] << " <Input image>" << std::endl;
+    return -1;
+  }
+  cvtColor(src, src_gray, cv::COLOR_BGR2GRAY);
+  cv::namedWindow(source_window);
+  cv::createTrackbar("Threshold: ", source_window, &thresh, max_thresh,
+                     cornerHarris_demo);
+  cv::imshow(source_window, src);
+  cornerHarris_demo(0, 0);
+  cv::waitKey();
+  return 0;
+}
+
+void cornerHarris_demo(int, void *) {
+  int blockSize = 2;
+  int apertureSize = 3;
+  double k = 0.04;
+  cv::Mat dst = cv::Mat::zeros(src.size(), CV_32FC1);
+  cv::cornerHarris(src_gray, dst, blockSize, apertureSize, k);
+  cv::Mat dst_norm, dst_norm_scaled;
+  normalize(dst, dst_norm, 0, 255, cv::NORM_MINMAX, CV_32FC1, cv::Mat());
+  convertScaleAbs(dst_norm, dst_norm_scaled);
+  for (int i = 0; i < dst_norm.rows; i++) {
+    for (int j = 0; j < dst_norm.cols; j++) {
+      if ((int)dst_norm.at<float>(i, j) > thresh) {
+        circle(dst_norm_scaled, cv::Point(j, i), 5, cv::Scalar(0), 2, 8, 0);
+      }
+    }
+  }
+  cv::namedWindow(corners_window);
+  cv::imshow(corners_window, dst_norm_scaled);
+}
-- 
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