OpenCV >> C/C++

trackbar

---

參考資訊：
1. examples
2. createtrackbar

prototype

int createTrackbar(
  const string& trackbarname, 
  const string& winname, 
  int* value, 
  int count, 
  TrackbarCallback onChange=0, 
  void* userdata=0);

main.cpp

#include <opencv2/core/utility.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
 
using namespace cv;
using namespace std;
 
int threshval=100;
 
static void on_trackbar(int, void*)
{
  char buf[255]={0};

  sprintf(buf, "%d", threshval);
  Mat img(250, 250, CV_8UC3, Scalar(128, 255, 255));
  putText(img, buf, Point(80, 100), FONT_HERSHEY_SIMPLEX, 1, (0, 0, 0), 1, LINE_AA);
  imshow("trackbar", img);
}
 
int main(int argc, const char** argv)
{
  namedWindow("trackbar", WINDOW_AUTOSIZE);
  createTrackbar("Threshold", "trackbar", &threshval, 255, on_trackbar);
  on_trackbar(threshval, 0);
  waitKey(0);
  return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})

編譯並且執行

$ cmake .
$ make
$ ./main

完成

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