Function cannyParallel

Parallel staged Canny: gradient, NMS/state classification and serial frontier propagation. The final propagation is deterministic.

raster.parallel_rows.ParallelRowsResult cannyParallel(
  scope const(float)[] src,
  ulong w,
  ulong h,
  float low,
  float high,
  ref ubyte[] edges,
  ulong workers = 0LU,
  ulong chunk = 1LU
) @trusted;