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DiSS (WACV 2023)

PyTorch implementaton of our WACV 2023 paper "Adaptively-Realistic Image Generation from Stroke and Sketch with Diffusion Model". You can visit our project website here.

In this paper, we propose a unified framework supporting a three-dimensional control over the image synthesis from sketches and strokes based on diffusion models. <img src='fig/teaser.png' width="800px">

Paper

Adaptively-Realistic Image Generation from Stroke and Sketch with Diffusion Model
Shin-I Cheng*, Yu-Jie Chen*, Wei-Chen Chiu, Hung-Yu Tseng, Hsin-Ying Lee
Winter Conference on Applications of Computer Vision (WACV), 2023 (* equal contribution)

Please cite our paper if you find it useful for your research.

@inproceedings{cheng2023wacv,
 title = {Adaptively-Realistic Image Generation from Stroke and Sketch with Diffusion Model},
 author = {Shin-I Cheng and Yu-Jie Chen and Wei-Chen Chiu and Hung-Yu Tseng and Hsin-Ying Lee},
 booktitle = {IEEE Winter Conference on Applications of Computer Vision (WACV)},
 year = {2023}
}

Installation and Environment

Prerequisities: Python 3.6 & Pytorch (at least 1.4.0)
Clone this repo

git clone https://github.com/cyj407/DiSS.git
cd DiSS

We provide a conda environment script, please run the following command after cloning our repo.

conda env create -f diss_env.yaml

Datasets

AFHQ (cat, dog, wildlife) You can follow the instructions in StarGAN v2 website to download the AFHQ (cat, dog, wildlife) dataset.
Flowers You can follow the instructions in the website to download the flower dataset.
Landscapes (LHQ) You can follow the instructions in ALIS website to download the LHQ1024 dataset.

User-Friendly Interface

To draw a sketch/stroke images on the interface or upload a reference input image, run the following command and access http://127.0.0.1:5000. First loading would need more time.

python app.py

The corresponding output image will be computed for about 55 seconds.

Train

Preparing sketch and stroke data

We utilize Photo-Sketching: Inferring Contour Drawings from Images for sketach generation and Stylized Neural Painting, Paint Transformer: Feed Forward Neural Painting with Stroke Prediction for stroke generation, please refer to our paper for details.
Please organize the whole dataset as follow:

Root Dir/
  -<dataset_path>/
    -Image1
    -Image2
    -...
  -"<dataset_path>_sketch"/
    -Image1
    -Image2
    -...
  -"<dataset_path>_stroke"/
    -Image1
    -Image2
    -...

Training your own models

We use the following hyperparameters among the three datasets in our paper, you can design your own ones.

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear" 
TRAIN_FLAGS="--lr 1e-4 --batch_size 2"

Train your own sketch and stroke conditioned diffusion models with desired data stored in <dataset_path>.

python train.py --data_dir <dataset_path> --path <path_for_saving_the_models> $MODEL_FLAGS $DIFFUSION_FLAGS $TRAIN_FLAGS

Finetune the trained models (stored at <pretrained_model_path>) for sketch and stroke classifier-free guidance (randomly replacing 30% of each condition with an image filled with gray pixels).

python finetune.py --data_dir <dataset_path> --path <path_for_saving_the_models> --trained_model <pretrained_model_path> $MODEL_FLAGS $DIFFUSION_FLAGS $TRAIN_FLAGS

Test

Using the pre-trained models

Download the pre-trained diffusion models, here we provide the pre-trained diffusion model for the AFHQ-cat, Flowers, LHQ and AFHQ(cats, dogs, and wildlife) dataset.
Unzip the downloaded file, and save all the model under the path ./checkpoints/.

Adaptively Sketch-to-Image Generation

Flowers

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear"
python sample.py $MODEL_FLAGS $DIFFUSION_FLAGS --timestep_respacing 250 --model_path "./checkpoints/flower512.pt" --lhq False --input_image "./test-examples/realism-example.png"

Landscapes

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear"
python sample.py $MODEL_FLAGS $DIFFUSION_FLAGS --timestep_respacing 250 --model_path "./checkpoints/lhq512.pt" --lhq True --input_image "./test-examples/realism-example2.png"

Multi-conditioned Local Editing

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear"
CUDA_VISIBLE_DEVICES=1, python local-editing.py $MODEL_FLAGS $DIFFUSION_FLAGS --timestep_respacing 250

Region-sensitive Stroke-to-Image

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear"
CUDA_VISIBLE_DEVICES=0, python partial-editing.py $MODEL_FLAGS $DIFFUSION_FLAGS --timestep_respacing 250

Multimodal Output (Given 1 stroke image guided with different sketches.)

MODEL_FLAGS="--attention_resolutions 32,16,8 --image_size 512 --num_channels 128 --num_res_blocks 3 --use_scale_shift_norm True"
DIFFUSION_FLAGS="--diffusion_steps 1000 --noise_schedule linear"
python multimodal.py $MODEL_FLAGS $DIFFUSION_FLAGS --timestep_respacing 250

Acknowledgments

Our code is based on guided-diffusion and pytorch-resizer. The inference code of the user interface is borrowed from blended-diffusion.