Question

This should be obvious, I thought. But I can’t find easy way to find maximum among all pixels in a Mat of OpenCV. Of course, I can do following for each pixel type. But general max function would be still useful.

double cvMax(cv::Mat& mat)
{
float max=0;
float* pData=(float*)mat.data;
for(int i=0;i<mat.rows;i++) 
{
    for(int j=0;j<mat.cols;j++)
    {
        float value = pData[j+i*mat.cols];
        if(value>max) 
        {
            max=value;
        }
    }
}
return max;
}

Answer 1

You could always use the std max_element function with iterators from opencv

std::max_element(Mat.begin<double>(),Mat.end<double>());