The 2nd edition of NTIRE: New Trends in Image Restoration and Enhancement workshop will be held July 21, 2017 in conjunction with CVPR 2017 in Honolulu, Hawaii.
Image restoration and image enhancement are key computer vision tasks, aiming at the restoration of degraded image content or the filling in of missing information. Recent years have witnessed an increased interest from the vision and graphics communities in these fundamental topics of research. Not only has there been a constantly growing flow of related papers, but also substantial progress has been achieved.
Each step forward eases the use of images by people or computers for the fulfillment of further tasks, with image restoration or enhancement serving as an important frontend. Not surprisingly then, there is an ever growing range of applications in fields such as surveillance, the automotive industry, electronics, remote sensing, or medical image analysis. The emergence and ubiquitous use of mobile and wearable devices offer another fertile ground for additional applications and faster methods.
NTIRE workshop aims to provide an overview of the new trends and advances in those areas. Moreover, it will offer an opportunity for academic and industrial attendees to interact and explore collaborations.
Jointly with NTIRE workshop we have an NTIRE challenge on example-based single-image super-resolution, that is, the task of restoration of rich details (high frequencies) in a high resolution image for a single low resolution input image based on a set of prior examples with low and corresponding high resolution images. The challenge has two tracks.
Track 1: "Classic bicubic" follows the classic / standard settings from the single-image super-resolution literature, that is, the degradation operators are the downscaling with bicubic interpolation (imresize Matlab function) of the ground truth high resolution image.
Track 2: "Unknown" assumes that the degradation operators are unknown for the participants under explicit form (such as blur kernel, decimation, downscaling strategy). The large training set of examples of low and corresponding high resolution images are intended for modeling the low to high image resolution mapping relation.
The top ranked participants on each track will be awarded and invited to follow the CVPR submission guide for workshops to describe their solution and to submit to the associated NTIRE workshop at CVPR 2017.
Note that for the final ranking and challenge winners we are weighing more the teams/participants with entries in more than one track/scale challenge. Ideally each participant will have entries for all the scaling factors of each track.
"Bicubic" (classic) track is meant to facilitate the easy deployment of recent proposed methods for the task for example-based single-image super-resolution. It assumes that the degradation operators are the same as commonly used in the recent super-resolution literature. For obtaining the low res images we use the Matlab function "imresize" with default settings (bicubic interpolation) and the desired downscaling factors: 2, 3, and 4. Each ground truth high resolution RGB image is downscaled to corresponding low resolution images and used either for training, validation, or testing of the methods. We are making available a large newly collected dataset -DIV2K- of images with a large diversity of contents.
More details are found on the data section of the competition.
"Unknown" track goes on step ahead from the classic bicubic interpolation assumed in most of the recent single-image super-resolution literature and considers that at runtime we know the low resolution input image and a set of (training) pairs of low and corresponding high resolution images. No Gaussian or other types of noise is added to the images. No other information is provided about the degrading operators producing the downscaling images. As commonly found in the literature, we consider 2, 3, and 4 for downscaling factors. Each ground truth high resolution RGB image is downscaled to corresponding low resolution images and used either for training, validation, or testing of the methods. We are making available a large newly collected dataset -DIV2K- of images with a large diversity of contents.
More details are found on the data section of the competition.
To learn more about each competition, to participate in the challenge, and to access the newly collected DIV2K dataset with DIVerse 2K resolution images everybody is invited to register at the following links, accordingly:
The training data is already made available to the registered participants.
The evaluation consists from the comparison of the restored high resolution images with the ground truth high resolution images. For this we use the standard Peak Signal To Noise Ratio (PSNR) and, complementary, the Structural Similarity (SSIM) index as often employed in the literature. Implementations are found in most of the image processing toolboxes. For each dataset we report the average results over all the processed images belonging to it.
Since some methods do not provide the restoration of the image boundaries we ignore an image boundary of (6+s) pixels, where s is the scaling factor of the setup. We recommand to the participants also to ignore an image boundary of (6+s) pixels for the provided train data. The boundary size is given for the high resolution image.
For submitting the results, you need to follow these steps:
runtime per image [s] : 10.43
CPU / GPU : 1
Extra Data  / No Extra Data  : 1
Other description : Solution based on A+ of Timofte et al. ACCV 2014. We have a Matlab/C++ implementation, and report single core CPU runtime. The method was trained on Train 91 of Yang et al. and BSDS 200 of the Berkeley segmentation dataset.
These are the official rules (terms and conditions) that guvern how the NTIRE challenge on example-based single-image super-resolution 2017 will operate. This challenge will be simply reffered to as the "challenge" or the "contest" throghout the remaining part of these rules and may be named as "NTIRE" or "DIV2K" benchmark, challenge, or contest, elsewhere (our webpage, our documentation, other publications).
In these rules, "we", "our", and "us" refer to the organizers (Radu Timofte and Eirikur Agustsson from ETH Zurich, CVL) of NTIRE challenge and "you" and "yourself" refer to an eligible contest participant.
Note that these official rules can change during the contest until the start of the final phase. If at any point during the contest the registered participant considers that can not anymore meet the eligibility criteria or does not agree with the changes in the official terms and conditions then it is the responsability of the participant to send an email to the organizers (Radu.Timofte [at] vision.ee.ethz.ch and Eirikur.Agustsson [at] vision.ee.ethz.ch) such that to be removed from all the records. Once the contest is over no change is possible in the status of the registered participants and their entries.
This is a skill-based contest and chance plays no part in the determination of the winner (s).
The goal of the contest is the restoration of a high resolution clean image with high frequencies (small details) from a low resolution input image and the challenge is called example-based single-image super-resolution.
Focus of the contest: it will be made available a newly collected dataset of at least 1000 high quality images collected from Internet and adapted for the specific needs of the challenge. The images are no larger than 2048 pixels on horizontal or vertical direction and have a large diversity of contents. We will refer to this dataset, its partition, and related materials as DIV2K (DIVerse 2K resolution images dataset). The dataset is divided into training, validation and testing data. We focus on two distinct settings: (track 1) example-based single-image super-resolution where the downscaling degradation operators are the same as in the recent literature (imresize Matlab function with bicubic interpolation) which will easy the deployment of the recent developed methods for our challenge, and (track 2) example-based single-image super-resolution where the degradation operators are keep hidden in the explicit form, the participant will know only the generated training data and validation data to develop and adapt their methods to achieve the best results on test data. The participants will not have access to the ground truth high resolution images from the test data. For each track the ranking of the participants is according to the performance of their methods on the test data. The participants will provide descriptions of their methods, details on (run)time complexity and (extra) data used for modeling. The winners will be determined according to their entries, the reproducibility of the results and uploaded codes or executables, and the above mentioned criteria as judged by the organizers.
The registered participants will be notified by email if any changes are made to the schedule.
You are eligible to register and compete in this contest only if you meet all the following requirements:
This contest is void wherever it is prohibited by law.
Entries submitted but not qualified to enter the contest, it is considered voluntary and for any entry you submit NTIRE reserves the right to evaluate it for scientific purposes, however under no circumstances will such entries qualify for sponsored prizes. If you are an employee, affiliated with or representant of any of the NTIRE challenge sponsors then you are allowed to enter in the contest and get ranked, however, if you will rank among the winners with eligible entries you will receive only a diploma award and none of the sponsored money, GPU or travel grants.
NOTE: industry and research labs are allowed to submit entries and to compete in both validation phase and final test phase. However, in order to get officially ranked on the final test leaderboard and to be eligible for awards the reproducibility of the results is a must and, therefore, the participants need to make available and submit their codes or executables. All the top entries will be checked for reproducibility and marked accordingly.
We will have 3 categories of entries in the final test ranking:
1) checked with publicly released codes
2) checked with publicly released executable
3) unchecked (with or without released codes or executables)
In order to be eligible for judging an entry must meet all the following requirements:
Entry contents: the participants are required to submit image results and code or executables. To be eligible for prizes, the top ranking participants should publicly release their code or executables under a license of their choice, taken among popular OSI-approved licenses (http://opensource.org/licenses) and make their code or executables online accessible for a period of not less than one year following the end of the challenge (applies only for top three ranked participants of the competition). To enter the final ranking the participants will need to fill out a survey (fact sheet) briefly describing their method. All the participants are also invited (not mandatory) to submit a paper for peer-reviewing and publication at the NTIRE Workshop and challenge on image super-resolution (to be held on July 21, 2017, Honolulu, Hawaii). To be eligible for prizes, the participants score must improve the baseline performance provided by the challenge organizers.
Use of data provided: all data provided by NTIRE are freely available to the participants from the website of the challenge under license terms provided with the data. The data are available only for open research and educational purposes, within the scope of the challenge. NTIRE and the organizers make no warranties regarding the database, including but not limited to warranties of non-infringement or fitness for a particular purpose. The copyright of the images remains in property of their respective owners. By downloading and making use of the data, you accept full responsibility for using the data. You shall defend and indemnify NTIRE and the organizers, including their employees, Trustees, officers and agents, against any and all claims arising from your use of the data. You agree not to redistribute the data without this notice.
Other than what is set forth below, we are not claiming any ownership rights to your entry. However, by submitting your entry, you:
Are granting us an irrevocable, worldwide right and license, in exchange for your opportunity to participate in the contest and potential prize awards, for the duration of the protection of the copyrights to:
Agree to sign any necessary documentation that may be required for us and our designees to make use of the rights you granted above;
Understand and acknowledge that us and other entrants may have developed or commissioned materials similar or identical to your submission and you waive any claims you may have resulting from any similarities to your entry;
Understand that we cannot control the incoming information you will disclose to our representatives or our co-sponsor’s representatives in the course of entering, or what our representatives will remember about your entry. You also understand that we will not restrict work assignments of representatives or our co-sponsor’s representatives who have had access to your entry. By entering this contest, you agree that use of information in our representatives’ or our co-sponsor’s representatives unaided memories in the development or deployment of our products or services does not create liability for us under this agreement or copyright or trade secret law;
Understand that you will not receive any compensation or credit for use of your entry, other than what is described in these official rules.
If you do not want to grant us these rights to your entry, please do not enter this contest.
The participants will follow the instructions on the CodaLab website to submit entries
The participants will be registered as mutually exclusive teams. Each team is allowed to submit only one single final entry. We are not responsible for entries that we do not receive for any reason, or for entries that we receive but do not work properly.
The participants must follow the instructions and the rules. We will automatically disqualify incomplete or invalid entries.
The board of NTIRE will select a panel of judges to judge the entries; all judges will be forbidden to enter the contest and will be experts in causality, statistics, machine learning, computer vision, or a related field, or experts in challenge organization. A list of the judges will be made available upon request. The judges will review all eligible entries received and select three winners for each of the two competition tracks based upon the prediction score on test data. The judges will verify that the winners complied with the rules, including that they documented their method by filling out a fact sheet.
The decisions of these judges are final and binding. The distribution of prizes according to the decisions made by the judges will be made within three (3) months after completion of the last round of the contest. If we do not receive a sufficient number of entries meeting the entry requirements, we may, at our discretion based on the above criteria, not award any or all of the contest prizes below. In the event of a tie between any eligible entries, the tie will be broken by giving preference to the earliest submission, using the time stamp of the submission platform.
ETH Zurich, KU Leuven, University of California at Merced, Hong Kong Polytechnic University, NVIDIA, SenseTime, Twitter Inc. and Google are the financial sponsors of this contest. There will be economic incentive prizes and travel grants for the winners (based on availability) to boost contest participation; these prizes will not require participants to enter into an IP agreement with any of the sponsors, to disclose algorithms, or to deliver source code to them. The participants affiliated with NVIDIA, SenseTime, Twitter Inc. and Google agree to not receive any sponsored money, GPU or travel grant in the case they will be among the winners.
Incentive Prizes for each track competitions (tentative, the prizes depend on attracted funds from the sponsors)
Publishing papers is optional and will not be a condition to entering the challenge or winning prizes. The top ranking participants are invited to submit a maximum 8-pages paper (CVPR2017 author rules) for peer-reviewing to NTIRE workshop.
The results of the challenge will be published together with NTIRE 2017 workshop paper in the 2017 CVPR Workshops proceedings.
The top ranked participants and participants contributing interesting and novel methods to the challenge will be invited to be co-authors of the challenge report paper which will be published in the 2017 CVPR Workshops proceedings. A detailed description of the ranked solution as well as the reproducibility of the results are a must to be an eligible co-author.
If there is any change to data, schedule, instructions of participation, or these rules, the registered participants will be notified at the email they provided with the registration.
Within seven days following the determination of winners we will send a notification to the potential winners. If the notification that we send is returned as undeliverable, or you are otherwise unreachable for any reason, we may award the prize to an alternate winner, unless forbidden by applicable law.
The prize such as money, GPU, or travel grant will be delivered to the registered team leader given that the team is not affiliated with any of the sponsors. It's up to the team to share the prize. If this person becomes unavailable for any reason, the prize will be delivered to be the authorized account holder of the e-mail address used to make the winning entry.
If you are a potential winner, we may require you to sign a declaration of eligibility, use, indemnity and liability/publicity release and applicable tax forms. If you are a potential winner and are a minor in your place of residence, and we require that your parent or legal guardian will be designated as the winner, and we may require that they sign a declaration of eligibility, use, indemnity and liability/publicity release on your behalf. If you, (or your parent/legal guardian if applicable), do not sign and return these required forms within the time period listed on the winner notification message, we may disqualify you (or the designated parent/legal guardian) and select an alternate selected winner.
The terms and conditions are inspired by and use verbatim text from the `Terms and conditions' of ChaLearn Looking at People Challenges.
The NTIRE challenge on Example-based Single-Image Super-Resolution is organized jointly with the NTIRE 2017 workshop. The results of the challenge will be published at NTIRE 2017 workshop and in the CVPR 2017 Workshops proceedings.
Radu Timofte (Radu.Timofte [at] vision.ee.ethz.ch) and Eirikur Agustsson (Eirikur.Agustsson [at] vision.ee.ethz.ch) are the contact persons and direct managers of the NTIRE challenge.
More information about NTIRE workshop and challenge organizers is available here: http://www.vision.ee.ethz.ch/ntire17/
Start: March 1, 2017, 11:59 p.m.
Description: During the development phase the training data is released and the participants can validate their methods on the validation data through the validation server and the leaderboard.
Start: April 10, 2017, 11:59 p.m.
Description: During the testing phase the participants are asked to run their methods on the test data and to submit their results to the server. The final leaderboard and ranking will be announced after the phase and the challenge is over.
April 17, 2017, 11:59 p.m.
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