rowRange method
Creates a matrix header for the specified row span.
The method makes a new header for the specified row span of the matrix. Similarly to Mat::row and Mat::col , this is an O(1) operation.
https://docs.opencv.org/4.x/d3/d63/classcv_1_1Mat.html#aa6542193430356ad631a9beabc624107
Implementation
Mat rowRange(int start, int end) {
final dst = Mat.empty();
cvRun(() => ccore.cv_rowRange(ref, start, end, dst.ptr, ffi.nullptr));
return dst;
}