It's an implementation of Efros and Freeman's "Image Quilting and Texture Synthesis" 2001
The output depends on two factors : PatchSize and OverlapWidth The running time depends on Sample Image dimensions, Desired Image dimensions, ThresholdConstant and PatchSize
python PatchBasedSynthesis.py /image/source.jpg Patch_Size Overlap_Width Initial_Threshold_error
for example
python PatchBasedSynthesis.py /home/afroz/textures/corn.jpg 30 5 78.0