traceAsync function
Trace returns the trace of a matrix.
For further details, please see: https://docs.opencv.org/master/d2/de8/group__core__array.html#ga3419ac19c7dcd2be4bd552a23e147dd8
Implementation
Future<Scalar> traceAsync(InputArray mtx) async =>
cvRunAsync((callback) => cffi.core_Trace_Async(mtx.ref, callback), scalarCompleter);