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In recent years, deep neural networks (DNNs) trained with transformed data have been applied to various applications such as privacy-preserving learning, access control, and adversarial defenses. However, the use of transformed data…

Computer Vision and Pattern Recognition · Computer Science 2023-09-08 Teru Nagamori , Sayaka Shiota , Hitoshi Kiya

We propose a privacy-preserving semantic-segmentation method for applying perceptual encryption to images used for model training in addition to test images. This method also provides almost the same accuracy as models without any…

Computer Vision and Pattern Recognition · Computer Science 2025-07-18 Homare Sueyoshi , Kiyoshi Nishikawa , Hitoshi Kiya

We present a novel privacy-preserving scheme for deep neural networks (DNNs) that enables us not to only apply images without visual information to DNNs for both training and testing but to also consider data augmentation in the encrypted…

Cryptography and Security · Computer Science 2019-05-07 Warit Sirichotedumrong , Takahiro Maekawa , Yuma Kinoshita , Hitoshi Kiya

We propose a novel method for privacy-preserving fine-tuning vision transformers (ViTs) with encrypted images. Conventional methods using encrypted images degrade model performance compared with that of using plain images due to the…

Computer Vision and Pattern Recognition · Computer Science 2024-08-19 Kouki Horio , Kiyoshi Nishikawa , Hitoshi Kiya

In this paper, we propose a privacy-preserving image classification method that is based on the combined use of encrypted images and the vision transformer (ViT). The proposed method allows us not only to apply images without visual…

Computer Vision and Pattern Recognition · Computer Science 2022-05-25 Zheng Qi , AprilPyone MaungMaung , Yuma Kinoshita , Hitoshi Kiya

Privacy-preserving and secure data sharing are critical for medical image analysis while maintaining accuracy and minimizing computational overhead are also crucial. Applying existing deep neural networks (DNNs) to encrypted medical data is…

Cryptography and Security · Computer Science 2024-11-12 Al Amin , Kamrul Hasan , Sharif Ullah , M. Shamim Hossain

We propose a transformation network for generating visually-protected images for privacy-preserving DNNs. The proposed transformation network is trained by using a plain image dataset so that plain images are transformed into visually…

Image and Video Processing · Electrical Eng. & Systems 2020-08-10 Hiroki Ito , Yuma Kinoshita , Hitoshi Kiya

In recent years, privacy-preserving methods for deep learning have become an urgent problem. Accordingly, we propose the combined use of federated learning (FL) and encrypted images for privacy-preserving image classification under the use…

Computer Vision and Pattern Recognition · Computer Science 2023-03-06 Teru Nagamori , Hitoshi Kiya

In this paper, we propose a privacy-preserving image classification method that uses encrypted images and an isotropic network such as the vision transformer. The proposed method allows us not only to apply images without visual information…

Computer Vision and Pattern Recognition · Computer Science 2022-04-19 AprilPyone MaungMaung , Hitoshi Kiya

We propose a low-rank adaptation method for training privacy-preserving vision transformer (ViT) models that efficiently freezes pre-trained ViT model weights. In the proposed method, trainable rank decomposition matrices are injected into…

Cryptography and Security · Computer Science 2025-07-17 Haiwei Lin , Shoko Imaizumi , Hitoshi Kiya

We propose a novel method for securely training the vision transformer (ViT) with sensitive data shared from multiple clients similar to privacy-preserving federated learning. In the proposed method, training images are independently…

Cryptography and Security · Computer Science 2024-08-13 Rei Aso , Sayaka Shiota , Hitoshi Kiya

A privacy-preserving clothing classification scheme is presented to enable secure occupant-centric control (OCC) systems. Although the utilization of camera images for HVAC control has been widely studied to optimize thermal comfort,…

Computer Vision and Pattern Recognition · Computer Science 2026-04-30 Tatsuya Chuman , Yousuke Udagawa , Hitoshi Kiya

Image retrieval systems help users to browse and search among extensive images in real-time. With the rise of cloud computing, retrieval tasks are usually outsourced to cloud servers. However, the cloud scenario brings a daunting challenge…

Computer Vision and Pattern Recognition · Computer Science 2022-09-05 Qihua Feng , Peiya Li , Zhixun Lu , Chaozhuo Li , Zefang Wang , Zhiquan Liu , Chunhui Duan , Feiran Huang

Traditional deep learning models implicity encode knowledge limiting their transparency and ability to adapt to data changes. Yet, this adaptability is vital for addressing user data privacy concerns. We address this limitation by storing…

Computer Vision and Pattern Recognition · Computer Science 2024-02-21 Sebastian Doerrich , Tobias Archut , Francesco Di Salvo , Christian Ledig

Unsupervised domain adaptation (UDA) aims to transfer knowledge from a labeled source domain to an unlabeled target domain. The most recent UDA methods always resort to adversarial training to yield state-of-the-art results and a dominant…

Computer Vision and Pattern Recognition · Computer Science 2024-04-25 Yahan Li , Yuan Wu

Deep neural networks (DNNs) are well known to be vulnerable to adversarial examples (AEs). In previous studies, the use of models encrypted with a secret key was demonstrated to be robust against white-box attacks, but not against black-box…

Artificial Intelligence · Computer Science 2024-02-13 Ryota Iijima , Sayaka Shiota , Hitoshi Kiya

In this paper, we propose a combined use of transformed images and vision transformer (ViT) models transformed with a secret key. We show for the first time that models trained with plain images can be directly transformed to models trained…

Computer Vision and Pattern Recognition · Computer Science 2023-01-11 Hitoshi Kiya , Ryota Iijima , MaungMaung Aprilpyone , Yuma Kinoshita

Standard deep learning models such as convolutional neural networks (CNNs) lack the ability of generalizing to domains which have not been seen during training. This problem is mainly due to the common but often wrong assumption of such…

Computer Vision and Pattern Recognition · Computer Science 2024-03-19 Mehrdad Noori , Milad Cheraghalikhani , Ali Bahri , Gustavo A. Vargas Hakim , David Osowiechi , Ismail Ben Ayed , Christian Desrosiers

Inverting visual representations within deep neural networks (DNNs) presents a challenging and important problem in the field of security and privacy for deep learning. The main goal is to invert the features of an unidentified target image…

Computer Vision and Pattern Recognition · Computer Science 2024-12-17 Sai Qian Zhang , Ziyun Li , Chuan Guo , Saeed Mahloujifar , Deeksha Dangwal , Edward Suh , Barbara De Salvo , Chiao Liu

Fine-grained classification is a challenging task that involves identifying subtle differences between objects within the same category. This task is particularly challenging in scenarios where data is scarce. Visual transformers (ViT) have…

Computer Vision and Pattern Recognition · Computer Science 2023-05-18 Manuel Lagunas , Brayan Impata , Victor Martinez , Virginia Fernandez , Christos Georgakis , Sofia Braun , Felipe Bertrand
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