StableNormal: Reducing Diffusion Variance for Stable and Sharp Normal

Chongjie Ye*, Lingteng Qiu*, Xiaodong Gu, Qi Zuo, Yushuang Wu, Zilong Dong, Liefeng Bo, Yuliang Xiu#, Xiaoguang Han#

* Equal contribution
# Corresponding Author

SIGGRAPH Asia 2024 (Journal Track)

We propose StableNormal, which tailors the diffusion priors for monocular normal estimation. Unlike prior diffusion-based works, we focus on enhancing estimation stability by reducing the inherent stochasticity of diffusion models ( i.e. , Stable Diffusion). This enables “Stable-and-Sharp” normal estimation, which outperforms multiple baselines (try Compare), and improves various real-world applications (try Demo).

News

• StableNormal-turbo (10 times faster) is now avaliable on ModelScope . We invite you to explore its features! 🔥🔥🔥 (10.11, 2024 UTC)
• StableNormal is accepted by SIGGRAPH Asia 2024. (Journal Track)) (09.11, 2024 UTC)
• Release StableDelight 🔥🔥🔥 (09.07, 2024 UTC)
• Release StableNormal 🔥🔥🔥 (08.27, 2024 UTC)

Installation:

Please run following commands to build package:

git clone https://github.com/Stable-X/StableNormal.git
cd StableNormal
pip install -r requirements.txt

or directly build package:

pip install git+https://github.com/Stable-X/StableNormal.git

Usage

To use the StableNormal pipeline, you can instantiate the model and apply it to an image as follows:

import torch
from PIL import Image

# Load an image
input_image = Image.open("path/to/your/image.jpg")

# Create predictor instance
predictor = torch.hub.load("Stable-X/StableNormal", "StableNormal", trust_repo=True)

# Apply the model to the image
normal_image = predictor(input_image)

# Save or display the result
normal_image.save("output/normal_map.png")

Additional Options:

• If you need faster inference(10 times faster), use StableNormal_turbo:

predictor = torch.hub.load("Stable-X/StableNormal", "StableNormal_turbo", trust_repo=True)

• If Hugging Face is not available from terminal, you could download the pretrained weights to weights dir:

predictor = torch.hub.load("Stable-X/StableNormal", "StableNormal", trust_repo=True, local_cache_dir='./weights')

Compute Metrics:

This section provides guidance on evaluating your normal predictor using the DIODE dataset.

Step 1: Prepare Your Results Folder

First, make sure you have generated a normal map and structured your results folder as shown below:

├── YOUR-FOLDER-NAME 
│   ├── scan_00183_00019_00183_indoors_000_010_gt.png
│   ├── scan_00183_00019_00183_indoors_000_010_init.png
│   ├── scan_00183_00019_00183_indoors_000_010_ref.png
│   ├── scan_00183_00019_00183_indoors_000_010_step0.png
│   ├── scan_00183_00019_00183_indoors_000_010_step1.png
│   ├── scan_00183_00019_00183_indoors_000_010_step2.png
│   ├── scan_00183_00019_00183_indoors_000_010_step3.png

Step 2: Compute Metric Values

Once your results folder is set up, you can compute the metrics for your normal predictions by running the following scripts:

# compute metrics
python ./stablenormal/metrics/compute_metric.py -i ${YOUR-FOLDER-NAME}

# compute variance
python ./stablenormal/metrics/compute_variance.py -i ${YOUR-FOLDER-NAME}

Replace ${YOUR-FOLDER-NAME}; with the actual name of your results folder. Following these steps will allow you to effectively evaluate your normal predictor's performance on the DIODE dataset.

Metrics

On DIODE-indoor

	Mean Error	Median Error	<11.25	<22.5	<30
GeoWizard	19.371	15.408	30.551	75.426	86.357
Marigold Normal	16.671	12.084	45.776	82.076	89.879
GenPercept	18.348	13.367	39.178	79.819	88.551
DSINE	18.453	13.871	36.274	77.527	86.976
StableNormal-turbo	16.748	13.573	35.806	84.585	91.335
StableNormal	13.701	9.460	63.447	86.309	92.107

On IBims-1

	Mean Error	Median Error	< 11.25	< 22.5	< 30
GeoWizard	19.748	9.702	58.427	77.616	81.575
Marigold Normal	18.463	8.442	64.727	79.559	83.199
GenPercept	18.600	8.293	64.697	79.329	82.978
DSINE	18.773	8.258	64.131	78.570	82.160
StableNormal-turbo	17.433	8.145	65.683	80.909	84.527
StableNormal	17.248	8.057	66.655	81.134	84.632

On Scannet

	Mean Error	Median Error	< 11.25	< 22.5	< 30
GeoWizard	21.439	13.390	37.080	71.653	79.712
Marigold Normal	21.284	12.268	45.649	72.666	79.045
GenPercept	20.652	10.502	53.017	74.470	80.364
DSINE	18.610	9.885	56.132	76.944	82.606
StableNormal-turbo	17.432	9.644	58.643	79.177	84.717
StableNormal	18.098	10.097	56.007	78.776	84.115

On NYUv2

	Mean Error	Median Error	< 11.25	< 22.5	< 30
GeoWizard	20.363	11.898	46.954	73.787	80.804
Marigold Normal	20.864	11.134	50.457	73.003	79.332
GenPercept	20.896	11.516	50.712	73.037	79.216
DSINE	-	-	-	-	-
StableNormal-turbo	18.788	10.381	53.741	76.713	82.884
StableNormal	19.707	10.527	53.042	75.889	81.723

Citation

@article{ye2024stablenormal,
  title={StableNormal: Reducing Diffusion Variance for Stable and Sharp Normal},
  author={Ye, Chongjie and Qiu, Lingteng and Gu, Xiaodong and Zuo, Qi and Wu, Yushuang and Dong, Zilong and Bo, Liefeng and Xiu, Yuliang and Han, Xiaoguang},
  journal={ACM Transactions on Graphics (TOG)},
  year={2024},
  publisher={ACM New York, NY, USA}
}