Error in Opencv - cannot convert ‘cv::Mat’ to ‘const CvArr*

Question

I am writing a code to extract yellow color alone from a video feed. After Converting it to HSV i feed that frame in inRangeS Function. I also have a Upperlimit, lower limit and output frame.

This is my code:-

cam>>frame; imshow("Main",frame); cvtColor(frame,frame,COLOR_BGR2HSV); imshow("HSV",frame); cvInRange(frame,cvScalar(20,100,100),cvScalar(30,255,255),redspace); imshow("Red",redspace);

it gives the following error:-

error: cannot convert ‘cv::Mat’ to ‘const CvArr* {aka const void*}’ for argument ‘1’ to ‘void cvInRange(const CvArr*, const CvArr*, const CvArr*, CvArr*)’ cvInRange(frame,cvScalar(20,100,100),cvScalar(30,255,255),redspace);

sgarizvi · Accepted Answer · 2015-09-29 05:31:20Z

You are using cvInRange function from the old C interface of OpenCV.

If you are using cv::Mat, the function cv::inRange from the C++ interface has to be used as follows.

cv::inRange(frame,cv::Scalar(20,100,100),cv::Scalar(30,255,255),redspace);

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