DiffPPTBF

This is the project page of the paper:

Guillaume Baldi, Rémi Allègre, Jean-Michel Dischler. Differentiable Point Process Texture Basis Functions for inverse procedural modeling of cellular stochastic structures, Computers & Graphics, Volume 112, 2023, Pages 116-131, ISSN 0097-8493, https://doi.org/10.1016/j.cag.2023.04.004.

You can get the paper (preprint) following this link.

The complete source code and procedural representations of cellular stochastic structures will be made progressively available, as of the beginning of April 2023.

Source code organization and requirements

The source code is split in 4 main directories:

• pix2pix is a fork the Pix2Pix original code, with some changes.
• estimation1 is our model for Optimization Phase #1, as described in the paper.
• estimation2 is the code for Optimization Phase #2, containing the implementation of the differentiable C-PPTBF, gradient descent with error metric based on the SWD1D, and Basin Hopping iterations.
• diffProxy is a fork of the DiffProxy original code, with some changes.

The requirements are described within each directory.

Pipeline

1. Reconstruction of a fake C-PPTBF image: in the pix2pix folder you can find the steps to reconstruct a fake C-PPTBF image, by training and testing your own trained model or testing by using our pre-trained model. It will output images of the reconstruction ending by _fake_B.png which will be used in the next steps.
2. Optimization Phase #1: in the estimation1 folder you can find the steps to estimate the tiling type and the initial values of continuous parameters by prediction using our pre-trained model. It will output json or txt files containing all the parameter values to be used in the Phase #2 and for DiffProxy.
3. Optimization Phase #2: in the estimation2 folder you can find the steps to perform the stochastic gradient descent for the optimization of the parameters.
4. DiffProxy: in the diffProxy folder you can find the steps to perform the optimization with DiffProxy using our pre-trained StyleGan2 model and the Sliced Wasserstein Loss. It will output a txt file for the logs of the minimization of the error function and the image matching the input image.

Note that you may have to adapt the paths to input and output files, depending on the configuration of you own project.

Dataset

The results of our paper can be reproduced using the database of binary structure maps used for the paper Semi-Procedural Textures Using Point Process Texture Basis Functions (EGSR 2020 CGF track paper), available following this link.

Reference

If you find this code useful for your research, consider citing:

@article{baldi2023cag,
	title = {Differentiable point process texture basis functions for inverse procedural modeling of cellular stochastic structures},
	journal = {Computers & Graphics},
	volume = {112},
	pages = {116-131},
	year = {2023},
	issn = {0097-8493},
	doi = {https://doi.org/10.1016/j.cag.2023.04.004},
	url = {https://www.sciencedirect.com/science/article/pii/S0097849323000419},
	author = {Guillaume Baldi and Rémi Allègre and Jean-Michel Dischler},
	keywords = {Texture and material synthesis, Texture basis function, Cellular stochastic structures, Inverse procedural modeling}
}