Sliced OT Color Transfer / CPU / Balanced

We discuss now about the Sliced Partial Optimal Transport case. For that, let us use to the optimized SPOT code (Nicolas Bonneel, David Coeurjolly).

Code

colorTransferPartial.cpp

Code comments

Usage

colorTransferPartial
Usage: ./colorTransferPartial [OPTIONS]

Options:
  -h,--help                   Print this help message and exit
  -s,--source TEXT            Source image
  -t,--target TEXT            Target image
  -o,--output TEXT            Output image
  -n,--nbsteps UINT           Number of sliced steps (3)
  -b,--sizeBatch UINT         Number of dirtections on a batch (1)
  -r,--regularization         Apply a regularization step of the transport plan using bilateral filter (false).
  --sigmaXY FLOAT             Sigma parameter in the spatial domain for the bilateral regularization (16.0)
  --sigmaV FLOAT              Sigma parameter in the value domain for the bilateral regularization (5.0)
  --silent                    No verbose messages

Timings

100 slices, default parameters, no regularization, same image size (3,5 GHz 6-Core Intel Xeon E5). When considering images with same size, the code has an overhead compared to the CPU/Balanced code.

./colorTransferPartial -s pexelA-0.png -t pexelB-0.png -o output.png -n 100 --silent
Source image: 1280x1024   (3)
Target image: 1280x1024   (3)
...
elapsed time: 34.1797s

When we increase the size of the target image to reproduce the results of Sliced Partial Optimal Transport:

./colorTransferPartial -s pexelA-0.png -t pexelB-0-larger.png -o output-partial.png -n 100
Source image: 1280x1024   (3)
Target image: 1536x1229   (3)
finished computation at Fri Aug 30 13:25:11 2019
elapsed time: 23.2826s
Exporting..