如何在OpenCV中阈值

How to threshold an image in OpenCV?

本文关键字：阈值 OpenCV      更新时间：2023-10-16

我在openCV中具有二进制图像，代表蒙版。这个面膜有一定程度的几何噪声，我想平滑，所以为此，我使用模糊。

现在我有了灰度图像。我想将所有像素都超过一定阈值，使它们变白，所有其他像素必须变成黑色。

在OpenCV中有一种简单的方法？

是的，有：

ret,thresh1 = cv.threshold(img,127,255,cv.THRESH_BINARY)

我从这个链接中得到。

在C 上，我们有

threshold( src_gray, dst, threshold_value, max_BINARY_value,threshold_type );

如果您想要更多信息，请在这里

上一个链接（C 教程）的完整代码

#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <stdlib.h>
#include <stdio.h>
using namespace cv;
/// Global variables
int threshold_value = 0;
int threshold_type = 3;;
int const max_value = 255;
int const max_type = 4;
int const max_BINARY_value = 255;
Mat src, src_gray, dst;
char* window_name = "Threshold Demo";
char* trackbar_type = "Type: n 0: Binary n 1: Binary Inverted n 2: Truncate n 3: To Zero n 4: To Zero Inverted";
char* trackbar_value = "Value";
/// Function headers
void Threshold_Demo( int, void* );
/**
 * @function main
 */
int main( int argc, char** argv )
{
  /// Load an image
  src = imread( argv[1], 1 );
  /// Convert the image to Gray
  cvtColor( src, src_gray, CV_BGR2GRAY );
  /// Create a window to display results
  namedWindow( window_name, CV_WINDOW_AUTOSIZE );
  /// Create Trackbar to choose type of Threshold
  createTrackbar( trackbar_type,
                  window_name, &threshold_type,
                  max_type, Threshold_Demo );
  createTrackbar( trackbar_value,
                  window_name, &threshold_value,
                  max_value, Threshold_Demo );
  /// Call the function to initialize
  Threshold_Demo( 0, 0 );
  /// Wait until user finishes program
  while(true)
  {
    int c;
    c = waitKey( 20 );
    if( (char)c == 27 )
      { break; }
   }
}

/**
 * @function Threshold_Demo
 */
void Threshold_Demo( int, void* )
{
  /* 0: Binary
     1: Binary Inverted
     2: Threshold Truncated
     3: Threshold to Zero
     4: Threshold to Zero Inverted
   */
  threshold( src_gray, dst, threshold_value, max_BINARY_value,threshold_type );
  imshow( window_name, dst );
}
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