Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Journal of Imaging was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 21 days and the median time to publication was 47 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abdeldjalil Ouahabi | Laurent Risser |
| Abraham Pouliakis | Lee-Xieng Yang |
| Achintya Bhowmik | Leonardo Rundo |
| Adam Marchewka | Leopoldo Altamirano-Robles |
| Adam Mazikowski | Lirong Wang |
| Adolfo Santoro | Livia Ionela Bobu |
| Ahmad Jalal | Lorenzo Putzu |
| Akira Asano | Luc Salvo |
| Alain Tremeau | Luca Arcari |
| Aldo Marzullo | Luciano Silva |
| Aleksandar Krmpot | Ludovic Sacchelli |
| Alessandre Tengattini | Łukasz Maliński |
| Alessandro Fanti | Mahmoud Elbattah |
| Alessandro Stefano | Manuel Cabaleiro |
| Alessandro Tonacci | Manuel Castejón-Limas |
| Alex Butean | Marcelo Becker |
| Alex W. Barker | Marcelo Faria |
| Alexander A. Gulin | Marco Botta |
| Alexandrino Gonçalves | Marco La Cascia |
| Alexey Chubarov | Marco Nervo |
| Alexey Mashtakov | Marco Viola |
| Alfred O. Ankrah | Marek Kojdecki |
| Ali Bakhshinejad | Marek Lankosz |
| Amir Benzaoui | Mariana Domnica Stanciu |
| Amyar Amine | Mariia Nazarkevych |
| An Cong Tran | Mario Ortega |
| Ana Corte-Real | Mariusz Maslak |
| Anastasiia Korokhina | Mariusz Szwoch |
| Andras Micsik | Marko Horvat |
| Andrea Barucci | Martina Teresa Bevacqua |
| Andrea Tangherloni | Massimo Ferri |
| Andrei Tarasov | Matteo Bruno Lodi |
| Andrzej Eugeniusz Stateczny | Matthias F. Froelich |
| Andy Wai Kan Yeung | Mehdi Nassiri |
| Anna Barnes | Meng Wu |
| Anna Pakula | Meropi Mari |
| Annette Förschler | Michael Majurski |
| Antigoni Panagiotopoulou | Michal Bola |
| Anton Tremsin | Michal Kawulok |
| Antonio Sarno | Michele Calì |
| Aparna Bharati | Miguel Melgarejo |
| Arka Datta | Mihalj Bakator |
| Asad Malik | Mikael Brudfors |
| Atsushi Imiya | Mikel Sesma-Sara |
| Attila Oláh | Miklós Bak |
| Augusto Garcia-Agundez | Milan Toma |
| Ayman Abdel-Hamid | Milena Georgieva |
| Balaji Panchapakesan | Miloslav Machacek |
| Barbara Siemiatkowska | Milvia Rossini |
| Barbara Zitova | Ming Tzer Lin |
| Bekir Kabasakal | Mirela Popa |
| Bernadette Dorizzi | Mirjeta Pasha |
| Bharath Nagaraja | Mittal Mohit |
| Birgitta Dresp-Langley | Mocanu Irina |
| Bogdan Ruszczak | Mohamed Dahmane |
| Bo-Lin Jian | Mohamed Sameer Abdallah |
| Brecken Blackburn | Monika Muszkieta |
| Bryan Scotney | Moreno Zanardo |
| Burkhard Schillinger | Moustafa Hussein |
| Byron Leite Dantas Bezerra | Muhammad Abir |
| Byunghwan Jeon | Muhammad Ashfaq Jiskani |
| Byung-Kuk Seo | Muhammad Attamimi |
| Carlos Cano-Espinosa | Muhammad Umar Chaudhry |
| Carmelo Militello | Muhib Ur Rahman |
| Catalin Stoean | Nageswara R. Madamanchi |
| Catherine Disney | Naoto Yagi |
| Cecile Meier | Nicholas Polydorides |
| Chandrama Sarker | Nikolaos Dikaios |
| Chao-Ching Ho | Nir Sochen |
| Chih-Peng Fan | Nitish Katoch |
| Chris Hall | Nuno Matela |
| Christian Kaunert | Oh-Jin Kwon |
| Christof Kauba | Olena Ivashchenko |
| Chuan Qin | Olivier Losson |
| Constantine Kotropoulos | Olivier Proux |
| Corina Nafornita | Omneya Attallah |
| Cristian Stanciu | Oriel Frigo |
| Dalei Hao | Otoniel López Granado |
| Daniela Origgi | Paavo A. Penttilä |
| Daniele La Forgia | Panagiotis F. Liaparinos |
| Danut Ovidiu Pop | Paolo Cardarelli |
| David Martín Gómez | Pascal Peter |
| David McMeekin | Patrick A. Helm |
| David R. Green | Patrick Callet |
| David S. Simon | Patrick Jackman |
| Davide Sgalaberna | Paulo Lopes |
| Deisy Chaves | Pavel Rajmic |
| Derya Birant | Pedro D. Frazão Correia |
| Diego Valsesia | Pedro Miguens Matutino |
| Dimitris Tsiktsiris | Per Nordblad |
| Dmitri Alekseevsky | Peter Burgholzer |
| Dominik Stöger | Peter Kazanzides |
| Dong-Geol Choi | Phuong T. Nguyen |
| Dragos Serban | Pierre Ambs |
| Eberhard Lehmann | Pierre-Luc St-Charles |
| Edson Eyji Sano | Piotr Lech |
| Eduardo Cabal-Yepez | Piotr S. Szczepaniak |
| Eduardo Quevedo-Gutiérrez | Po-Yu Kao |
| Edward Jones | Prasanna Kolar |
| Eleni D. Filippaki | Priyadarshini A. Pattanaik |
| Elisabetta Canetta | Rahul Upneja |
| Emmanuel Dufourq | Rami Zewail |
| Enrico Cassano | Ramón Quiza |
| Enrico Le Donne | Ranjit Shrestha |
| Ernest U. Ekpo | Raphael Dueire Lins |
| Eryk Czerwiński | Raquel Conceição |
| Evgeny Belyaev | Razvan Boboc |
| Fahad E. Salamh | Renato Cuocolo |
| Federico Grillini | Riesz Ferenc |
| Fei Gao | Rihana Peiman |
| Flavio Bertini | Rikke Gade |
| Francesco Marra | Rita Gouveia Nunes |
| Francesco Riggi | Rizwan Ali Naqvi |
| Francesco Stellato | Robail Yasrab |
| Francisco Gomez-Donoso | Robert Frischholz |
| Frank Pillekamp | Rodica Holonec |
| G. M. Atiqur Rahaman | Roman Shults |
| Gabor Fichtinger | Roumen Kounchev |
| Gabriel Ramos Llorden | Runze Liu |
| Gabriele Salvato | Rute Santos |
| Gabriele Vigne | Ryo Itabashi |
| Ganbayar Batchuluun | Şaban Öztürk |
| Gazanfar Rahmathulla | Sabine Kling |
| Gennaro Vessio | Samuel Morillas Gomez |
| Gerard De Haan | Sara Gonizzi Barsanti |
| Germán González | Sara Moccia |
| Germana Landi | Sebastian Budzan |
| Ghazal Rouhafzay | Selma Rizvić |
| Gil-Jin Jang | Serestina Viriri |
| Giulia Festa | Seung-ho Lee |
| Giuseppe Gallo | Seungryul Baek |
| Goo-Rak Kwon | Shamim Hasnat Ripon |
| Guanqiu Qi | Shanshan Tan |
| Guillaume Haiat | Shaofeng Wang |
| Haipeng Liu | Sharifa Alghowinem |
| Hamdi Zurqani | Shashank Srivastava |
| Hannes Mareen | Sheryl Brahnam |
| Helder Sebastião | Shih-Chun Lee |
| Hirohiko Shimizu | Shusei Kanie |
| Hirokazu Madokoro | Shyhtsong Lin |
| Homayoun Najjaran | Silvia Zappavigna |
| Hongfeng Yu | Simona Di Meo |
| Hsuan-Ming Feng | Simona Moldovanu |
| Hui Fang | Simone Tassani |
| Hyuncheol Ki | Sinsia A. Gao |
| Hyungchul Yoon | Slavenka Petrak |
| Hyung-Jeong Yang | Sonam Kaul |
| Hyunho Kang | Stanisław Hożyń |
| Hyunseok Seo | Stefan Guthe |
| Hyunsoo Lee | Stefan Scheib |
| Igor Djurović | Stephan Boden |
| Ijaz Ul Haq | Stephen H. Anderson |
| Ines Channoufi | Stuart Perry |
| Isabella Gagliardi | Suah Kim |
| Ivan Magdalenić | Subhadip Mukherjee |
| Jacopo Tessadori | Sung Ha Kang |
| James Doutch | Suresh Merugu |
| Jan Egger | Susana Coentro |
| Jasmina Lukinac | Sven Vogel |
| Jason Brazile | Sylvie Chambon |
| Jason G. Zeibel | Takeharu Nagai |
| Jean Sequeira | Takeshi Fujiwara |
| Jean-Jacques Ponciano | Tania Pouli |
| Jehan-Antoine Vayssade | Tanmay Verlekar |
| Jennifer R. Schroeder | Tao-Hsing Chen |
| Jhilik Bhattacharya | Tatiana Bubba |
| Ji Hwan Park | Teng Grace Zhang |
| Jia Uddin | Tetsushi Ikeda |
| Jian Wang | Thanh Hai Nguyen |
| Jiankang Deng | Thorsten Derlin |
| Jimmy Aurelio Rosales-Huamaní | Tianfei Zhou |
| Jing Qin | Tien-Ying Kuo |
| Jinglun Feng | Ting-To Yu |
| Joan Bordoy | Tom Bultreys |
| Joel R. Bock | Tomáš Skopal |
| John K. Delaney | Tomas Zikmund |
| Jonathan Perrin | Tomasz Kryjak |
| Jonghoek Kim | Tomasz Litwin |
| Jong-Uk Hou | Tomislav Keser |
| Jorge Luis Zambrano-Martinez | Tomislav Matic |
| Jorge Maestre Vidal | Tu-Liang Lin |
| José Alonso Solís-Lemus | Tytus Bernas |
| José María Martínez-Otzeta | Valentin Debarnot |
| Juan A. Peña | Valentina Franceschi |
| Juan Luis Nieves | Vibhuti Gupta |
| Jui-yu Wu | Victor Fernandez Nascimento |
| Jung Sun Yoo | Victor Leiva |
| Junrui Li | Víctor M. Campello |
| Jyh Miin Lin | Vincenzo Conti |
| Kai Zeng | Voegeli Wolfgang |
| Kailun Yang | Wassim Swaileh |
| Kaisa Liimatainen | Weibo Liu |
| Kalyan R. S. Perumalla | William Mcllhagga |
| Kamlesh Mistry | Wonsuk Cha |
| Kang-Chun Peng | Wouter Van Verre |
| Karim Hammoudi | Wu Zhou |
| Katarzyna Beata Cywka | Wulf Grählert |
| Kenichi Oikawa | Xenophon Zabulis |
| Kenji Shimazoe | Xu Gao |
| Khairun Saddami | Yanwen Sun |
| Kinjiro Amano | Yassine Himeur |
| Klaus Michael Spohr | Yicheng Ni |
| Kogularasu Sakthivel | Yohei Inaba |
| Kosin Chamnongthai | Zachary Langford |
| Krassimir Markov | Zeno Geradts |
| Krzysztof Gorzkiewicz | Zhaohui Tang |
| Krzysztof Klimaszewski | Zhaohui Xue |
| Lasse Lensu | Zhengwei Li |
| László Szentmiklósi | Zhi Deng |
| Laura Antonelli | Zhi Qiao |
| Laurence Likforman-Sulem | Zhilu Lai |
| Laurent Najman | Ziming Zhang |
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