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c++iosjsonopencvmatrix
aledalgrande
aledalgrande

Reputation: 5217

Converting OpenCV Mat to array (possibly NSArray)

My C/C++ skills are rusty and the documentation for OpenCV is pretty obscure. Is there a way of getting a cv::Mat data attribute converted to array/NSArray?

I want to serialize it to JSON, I know I can use the FileStorage utility to convert to YAML/XML, but that's not what I want to do.

Mat -> NSArray -> JSON

(I want to send intrinsic camera calibration values to the server)

Thanks

Upvotes: 3

Views: 3066

Answers (1)

berak
berak

Reputation: 39796

you can use:

double *d = intrinsics.ptr<double>(0);

this will give you an array of 9 doubles. (it's just a cast, so be careful not to let the intrinsics Mat go out of scope.)

or 

double d = intrinsics.at<double>(i,j);

to access a single element.

Upvotes: 3

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