CODEWITHSUNDEEP
c++opencv
mtortorise
mtortorise

Reputation: 15

opencv convertTo not working

I know this question has been asked and answered by others. But I still can't not solve my question. I read a frame from a video, which has format unsigned char (CV_8U). I hope to convert it to double precision(CV_64F). I do as following:

VideoCapture capture(fileName);
Mat image;
capture >> image;
cvtColor(image, image, CV_BGR2GRAY);
image.convertTo(image, CV_32FC1, 1.0/255);
cout << typeid(image.data[0]).name() << endl;

But the result shows the image is still unsigned char. What's wrong with my code? Thank.

Upvotes: 0

Views: 1044

Answers (1)

bendervader
bendervader

Reputation: 2660

This is not the right way to test for type conversion.

OpenCV's data variable in cv::Mat is always of type uchar. It is basically a pointer to memory, but it doesn't mean that the data is uchar.

To get the type of the image data use the type() function. Here is an example to test if the type was successfully converted to float (which will be)

cv::DataType<float>::type == image.type();

Upvotes: 2

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