c++ - OpenCV Background substraction using Absdiff -

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i've been working program detect hands background substracting. have tried save first frame of camera background , substract current frame, appeared have different brightness somehow. i've tried several times , dont have , light changing, can problem? image1 image2

#include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> #include "camera.h" #include <opencv2/core/core.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/video/background_segm.hpp> using namespace cv; using namespace std; int main() {     const int laptop_cam = 0;     const int lifecam = 1;     const int max_fps = 25;     camera cam(lifecam);     mat background;      cam.takeshot();     cam.mirrorimage();      cam.getframe().copyto(background); //deep copy     imshow("background", background);     mat diff;     while (true) {         cam.takeshot();         cam.mirrorimage();         absdiff(cam.getframe(),background , diff);          imshow("result", cam.getframe());         imshow("diff", diff);          cam.set_fps(max_fps);          if (waitkey(1) == 27)             break;      }  }

here "camera.cpp":

#include "camera.h" camera::camera() { }   camera::~camera() {  } camera::camera(int camnum) {     videocapture cap(camnum);     _capture = cap; } void camera::takeshot() {     _capture >> _frame; } void camera::set_fps(int fps) {     if (fps > 25)         fps = 25;     else if (fps < 1)         fps = 1;     _capture.set(cv_cap_prop_fps, fps); } mat camera::getframe() {     return _frame; } void camera::mirrorimage() {     flip(_frame, _frame, 1); }

there should subtle lighting change , absolute subtraction hardly work. if have use absolute different, might want threshold diff.

however, should background subtraction algorithm. opencv has built-in methods: mog2, knn.

also, can detect hands using skin (color) detection.


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