DisQUE

This repository contains the official implementation of the DisQUE model proposed in the following paper.

1. A. K. Venkataramanan, C. Stejerean, I. Katsavounidis, H. Tmar and A. C. Bovik, "Joint Quality Assessment and Example-Guided Image Processing by Disentangling Picture Appearance from Content," arXiv preprint 2024.

DisQUE is a multi-purpose deep network that uses disentangled representations to perform both tunable image processing/enhancement using the novel paradigm of example-guided image processing, and image quality prediction.

Features of DisQUE

1. A disentangled representation encoder that decomposes an image into its content ("what the image is showing") and appearance ("how it looks") components.
2. A novel paradigm called example-guided image processing (EGIP) where the desired image processing behavior is specified at runtime using an example input-output pair. The relationship between the example images is inferred by the network and applied to the input image.
3. A novel "appearance mixing" approach to improve the robustness of EGIP.
4. A state-of-the-art self-supervised quality prediction model using the same DisQUE feature set.

Example-Guided Image Processing

Humans and algorithms approach image processing tasks in different ways. Humans typically use subjective judgements of the appearance of an image when editing it, say using tools like Adobe Photoshop, Da Vinci Resolve, or Instagram filters.

On the other hand, algorithms require specifying either a large number of human-generated paired examples, which may be cumbersome to obtain, or technical specifications of parameters such as contrast gain, non-linear gamma, etc. Moreover, as consumer preferences change over time and to personalize models to individual consumers, datasets (and trained models) and algorithm parameters must be updated periodically.

Example-Guided Image Processing bridges the gap between these two approaches by creating a model that uses a single example pair to define the desired image processing behavior. The inferred implicit relationship is then applied to the input image tobe processed.

Usage

Setting up the environment

Create and activate a virtual environment using

python3 -m virtualenv .venv
source .venv/bin/activate

Install all required dependencies

python3 -m pip install -r requirements.txt

Download pretrained model checkpoints and sample images

python3 download_data.py

Perform Example-Guided Image Processing

To perform example-guided image processing, select an example input-output pair to specify the desired transformation, and the input to be processed. Then, run

python3 process_image_using_example.py --ckpt_path <path to trained model checkpoint> --source_range <pixel value range of source domain> --target_range <pixel value range of target domain> --example_source_path <source image of example pair> --example_target_path <target image of example pair> --input_source_path <input image in source domain to be processed> --output_target_path <path to save output image in target domain>

To reproduce the example-guided tone mapping results shown below, run

./process_all_sample_images.sh

Extract quality features from one video pair

To compute features from one video pair for either the FUNQUE(+) models or the baseline models, use the command

python3 extract_features.py --ref_video <path to reference video> --dis_video <path to distorted video> --ckpt_path <path to trained model checkpoint>

For more options, run

python3 extract_features.py --help

Extract quality features for all videos in a dataset

First, define a subjective dataset file compatible with QualityLIB. Then, run

python3 extract_features_from_dataset.py --dataset <path to dataset file> --ckpt_path <path to trained model checkpoint> --processes <number of parallel processes to use>

Note: This command computes features and saves the results to disk. It does not print any features. Saved features may be used for downstream tasks - example below

For more options, run

python3 extract_features_from_dataset.py --help

Results

Example-Guided Tone Mapping Using DisQUE

Examples of tunable tone mapping of high dynamic range (HDR) images are shown below.

Tuning Contrast Using An Example

Tuning Color Saturation Using An Example

Tuning Brightness Using An Example

Tuning Global Color Using An Example

Quality Prediction Using DisQUE

DisQUE achieves SOTA quality prediction accuracy for both HDR tone mappinga and SDR images.

Predicting the Quality of Tone-Mapped HDR Images

Model	PCC	SROCC	RMSE
RcNet	0.5985	0.5824	8.2417
HIGRADE	0.6682	0.6698	8.2619
CONTRIQUE	0.7360	0.7230	6.8476
ReIQA	0.7583	0.7812	7.2951
Cut-FUNQUE	0.7783	0.7781	6.4187
MSML	0.7883	0.7740	6.8090
DisQUE	0.8160	0.8215	6.3241

Predicting the Quality of SDR Images (SROCC Only)

Model	LIVE-IQA	CSIQ	TID2013	KADID-10k
PSNR	0.881	0.820	0.643	0.677
BRISQUE	0.939	0.746	0.604	0.528
SSIM	0.921	0.854	0.642	0.641
FSIM	0.964	0.934	0.852	0.854
CORNIA	0.947	0.678	0.678	0.516
LPIPS	0.932	0.884	0.673	0.721
CONTRIQUE	0.966	0.956	0.909	0.946
ReIQA	0.973	0.961	0.905	0.901
DisQUE	0.970	0.961	0.922	0.934

Contact

If you encounter any bugs or issues, or if you would like to make a contribution, please raise an Issue! Alternatively, you can contact me at [email protected] or [email protected].