OpenCV返回面部的矩形和区域这些被发现的面孔覆盖。如果我必须编写显示有多少面孔的程序（人们有面孔，或面孔附着在人们身上），我只需要计算返回的面孔数量。



例如，以下代码显示了需要完成的示例;我修改它以满足您的需要，

  //  检测面 
此 .faceCascade.detectMultiScale（grayFrame，faces， 1  。 1 ，
 2 ， 0  | Objdetect.CASCADE_SCALE_IMAGE，
 new 大小（此 .absoluteFaceSize，
 this  .absoluteFaceSize）， new  Size（））; 

 Rect [] facesArray = faces.toArray（）;  //  将面转换为数组 
 int  people = facesArray.length;  //  人数 

人脸检测和跟踪 - OpenCV Java Tutorials 1.0文档 [ ^ ]



代码示例可以从GitHub中获取， GitHub - opencv-java / face-detection：使用OpenCV和JavaFX进行人脸检测 [ ^ ]

I want to make library that show as how many people are using it so i think i should count the number of user by detecting their face through java openCv. I want to count number of people in the image, using that library.

What I have tried:

am using the defult OPenCV FACE detecthion but how can i count it

OpenCV returns the rectangles for the faces, and the areas that those "detected" faces cover. If I had to write the program that shows how many faces are there (people have faces, or faces are attached to the people), I would have simply counted the number of faces returned.

For example, the following code shows a sample of what needs to be done; I modified it to fit your need,

// Detects the faces
this.faceCascade.detectMultiScale(grayFrame, faces, 1.1, 
                                  2, 0 | Objdetect.CASCADE_SCALE_IMAGE, 
                                  new Size(this.absoluteFaceSize, 
                                  this.absoluteFaceSize), new Size());

Rect[] facesArray = faces.toArray(); // Converts the faces to array
int people = facesArray.length;      // Number of people

Face Detection and Tracking — OpenCV Java Tutorials 1.0 documentation[^]

The code sample can be captured from GitHub, GitHub - opencv-java/face-detection: Face detection with OpenCV and JavaFX[^]