GenImage: A Million-Scale Benchmark for Detecting AI-Generated Image [Homepage]

Mingjian Zhu, Hanting Chen, Qiangyu Yan, Xudong Huang, Guanyu Lin, Wei Li, Zhijun Tu, Hailin Hu, Jie Hu, Yunhe Wang

⭐News: We have recently released a paper, which proposes a detector named GenDet for AI-generated image detection! https://arxiv.org/abs/2312.08880

This repository is the official repository of the GenImage benchmark.

This repository contains the GenImage dataset and the evaluated methods.

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GenImage is a million-scale AI-generated image detection dataset. This dataset has the following advantages:

Plenty of Images: Over one million <fake image, real image> pairs.
Rich Image Content: Using the same classes in ImageNet, i.e., 1000 classes images.
State-of-the-art Generators: Midjourney, Stable Diffusion, ADM, GLIDE, Wukong, VQDM, BigGAN.

Dataset

The training set and testing set used in the paper can be downloaded in Baidu Yunpan. The code is ztf1.

Each folder contains compressed files. After unzip the file, files under the data root directory can be organized as follows. The ai folder contains the AI-generated images, and the nature folder contains the collected images from ImageNet.

├── Midjourney
│   ├── train
│   │   ├── ai
│   │   ├── nature
│   ├── val
│   │   ├── ai
│   │   ├── nature
├── VQDM
│   ├── train
│   │   ├── ai
│   │   ├── nature
│   ├── val
│   │   ├── ai
│   │   ├── nature
├── Wukong
│   ├── ...
├── Stable Diffusion V1.4
│   ├── ...
├── Stable Diffusion V1.5
│   ├── ...
├── GLIDE
│   ├── ...
├── BigGAN
│   ├── ...
├── ADM
│   ├── ...

Tutorial

To train a detector with Stable diffusion v1.4, we can only use Stable Diffusion V1.4/ folder. To train a detector with full GenImage training set, we should create a folder named imagenet_ai, as follows.

├── imagenet_ai
│   ├── train
│   │   ├── ai
│   │   ├── nature
│   ├── val
│   │   ├── ai
│   │   ├── nature

All the images in the generator foloder should be put into the corresponding folder in imagenet_ai. For example, the images in Midjourney/train/ai should be put into imagenet_ai/train/ai. The images in VQDM/val/nature should be put into imagenet_ai/val/nature. Then we can train a binary classifier for the dataset. A typical example is training a ResNet-50 with Timm Library and 2 GPU.

sh ./distributed_train.sh 2 /cache/imagenet_ai/ -b 64 --model resnet50 --sched cosine --epochs 200 --lr 0.05 --amp --remode pixel --reprob 0.6 --aug-splits 3 --aa rand-m9-mstd0.5-inc1 --resplit --jsd --dist-bn reduce --num-classes 2

Detection Methods

We use the codes of detection methods provided in the corresponding paper. The codes are stored in detection_codes/ folder.

Generators

We use the codes of generative models provided in the corresponding paper. The codes are stored in generator_codes/ folder.

Benchmark

Table 3: Results of different methods trained on SD V1.4 and evaluated on different testing subsets.

Method / Testing Subset	Midjourney	SD V1.4	SD V1.5	ADM	GLIDE	Wukong	VQDM	BigGAN	Avg Acc.(%)
ResNet-50	54.9	99.9	99.7	53.5	61.9	98.2	56.6	52.0	72.1
DeiT-S	55.6	99.9	99.8	49.8	58.1	98.9	56.9	53.5	71.6
Swin-T	62.1	99.9	99.8	49.8	67.6	99.1	62.3	57.6	74.8
CNNSpot	52.8	96.3	95.9	50.1	39.8	78.6	53.4	46.8	64.2
Spec	52.0	99.4	99.2	49.7	49.8	94.8	55.6	49.8	68.8
F3Net	50.1	99.9	99.9	49.9	50.0	99.9	49.9	49.9	68.7
GramNet	54.2	99.2	99.1	50.3	54.6	98.9	50.8	51.7	69.9

Table 4: Results of cross-validation on different training and test subsets using different methods. Eight models trained on eight generators are tested on one generator, and their average accuracy is each data point in the testing subset column.

Method / Testing Subset	Midjourney	SD V1.4	SD V1.5	ADM	GLIDE	Wukong	VQDM	BigGAN	Avg Acc.(%)
ResNet-50	59.0	72.3	72.4	59.7	73.1	71.4	60.9	66.6	66.9
DeiT-S	60.7	74.2	74.2	59.5	71.1	73.1	61.7	66.3	67.6
Swin-T	61.7	76.0	76.1	61.3	76.9	75.1	65.8	69.5	70.3
CNNSpot	58.2	70.3	70.2	57.0	57.1	67.7	56.7	56.6	61.7
Spec	56.7	72.4	72.3	57.9	65.4	70.3	61.7	64.3	65.1
F3Net	55.1	73.1	73.1	66.5	57.8	72.3	62.1	56.5	64.6
GramNet	58.1	72.8	72.7	58.7	65.3	71.3	57.8	61.2	64.7

Table 5: Model evaluation on degraded images. q denotes quality.

Method / Testing Subset	LR (112)	LR (64)	JPEG (q=65)	JPEG (q=30)	Blur ($\sigma$=3)	Blur ($\sigma$=5)	Avg Acc.(%)
ResNet-50	96.2	57.4	51.9	51.2	97.9	69.4	70.6
DeiT-S	97.1	54.0	55.6	50.5	94.4	67.2	69.8
Swin-T	97.4	54.6	52.5	50.9	94.5	52.5	67.0
CNNSpot	50.0	50.0	97.3	97.3	97.4	77.9	78.3
Spec	50.0	49.9	50.8	50.4	49.9	49.9	50.1
F3Net	50.0	50.0	89.0	74.4	57.9	51.7	62.1
GramNet	98.8	94.9	68.8	53.4	95.9	81.6	82.2

Reference

If you find our repository useful for your research, please consider citing our paper:

@misc{zhu2023genimage,
      title={GenImage: A Million-Scale Benchmark for Detecting AI-Generated Image}, 
      author={Mingjian Zhu and Hanting Chen and Qiangyu Yan and Xudong Huang and Guanyu Lin and Wei Li and Zhijun Tu and Hailin Hu and Jie Hu and Yunhe Wang},
      year={2023},
      eprint={2306.08571},
      archivePrefix={arXiv},
      primaryClass={cs.CV}
}