CV_HAAR_SCALE_IMAGE 未在 Windows 上的 OpenCv4 中定义

Question

I am using OpenCv4 on windows , tried to run C++ code in visual Studio 2017, but it says that CV_HAAR_SCALE_IMAGE and CV_HOUGH_GRADIENT is not defined , some solutions suggested to use cv2 prefix but cv2 is not defined too , i am using Opencv4 and setup the path.

cv::Mat grayscale;
 cv::cvtColor(frame, grayscale, cv::COLOR_BGR2GRAY); // convert image to grayscale
 cv::equalizeHist(grayscale, grayscale); // enhance image contrast 
 std::vector<cv::Rect> faces;
 faceCascade.detectMultiScale(grayscale, faces, 1.1, 2, 0 | CV_HAAR_SCALE_IMAGE, cv::Size(150, 150));
 if (faces.size() == 0) return; // none face was detected

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More Details

I'm trying to implement Mouse eyeball tracking for mouse control using code from this repo. https://abnerrjo.github.io/blog/2017/01/28/eyeball-tracking-for-mouse-control-in-opencv/

Currently it shows some variable as sytax error so i cant build

in this function defination CV_HAAR_SCALE_IMAGE is says undefined

also CV_HOUGH_GRADIENT was same but i changed it to cv::COLOR_BGR2GRAY and it works now

Additional modules added in project

Answer 1

It's now called CASCADE_SCALE_IMAGE or cv::CASCADE_SCALE_IMAGE if you aren't using the cv namespace. I think that change was with OCV 3.