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Deep copy of list of instances with cv::Mat members

What is the best way to make a deep copy of a list of instances who have Mat members?

Lets say I have this class:

class myClass {
    public:
        Mat image;

        myClass(Scalar value) {
            this->image =  Mat(300, 300, CV_8UC3, value);
        }
};

I can populate a list of instances with:

instances.push_back(myClass(Scalar(0,255,0)));
instances.push_back(myClass(Scalar(0,255,255)));

Now I would like a second list that is a deep copy of the instances including the underlying Mat data. Just doing the following does a shallow copy:

list<myClass> newInstances = instances;

The problem is that I have opencv doing some vision stuff in one thread, and I want to copy the data into the main renderer such that the renderer will not keep data from being cleared in the thread.

Thanks.