修改了opencv4的兼容性，现在opencv3未知

ImageDetect/ImageDetect.cxx

@@ -1,7 +1,7 @@
 #include <vector>
 #include <iostream>
 #include <exception>
-#include <opencv/cv.h>
+#include <opencv2/opencv.hpp>
 #include <opencv2/imgcodecs.hpp>
 #include <opencv2/imgproc.hpp>
 #include <opencv2/videoio.hpp>
@@ -22,7 +22,7 @@ using namespace cv;
 void detect_brightness(cv::Mat input_img, float& cast, float& da)
 {   
     cv::Mat gray_img;  
-    cv::cvtColor(input_img, gray_img, CV_BGR2GRAY);
+    cv::cvtColor(input_img, gray_img, COLOR_BGR2GRAY);
 
     float a = 0, Ma = 0;   
     int hist[256] = { 0 };