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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

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

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 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 novel method for privacy-preserving deep neural networks (DNNs) with the Vision Transformer (ViT). The method allows us not only to train models and test with visually protected images but to also avoid the performance…

Computer Vision and Pattern Recognition · Computer Science 2024-02-12 Teru Nagamori , Sayaka Shiota , Hitoshi Kiya

In this paper, we propose a privacy-preserving image classification method using encrypted images under the use of the ConvMixer structure. Block-wise scrambled images, which are robust enough against various attacks, have been used for…

Computer Vision and Pattern Recognition · Computer Science 2022-08-05 Zheng Qi , AprilPyone MaungMaung , 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

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 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

In this paper, a privacy preserving image classification method is proposed under the use of ConvMixer models. To protect the visual information of test images, a test image is divided into blocks, and then every block is encrypted by using…

Computer Vision and Pattern Recognition · Computer Science 2023-01-18 Rei Aso , Tatsuya Chuman , 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

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 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

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

Patch attacks, one of the most threatening forms of physical attack in adversarial examples, can lead networks to induce misclassification by modifying pixels arbitrarily in a continuous region. Certifiable patch defense can guarantee…

Computer Vision and Pattern Recognition · Computer Science 2022-03-17 Zhaoyu Chen , Bo Li , Jianghe Xu , Shuang Wu , Shouhong Ding , Wenqiang Zhang

We propose an end-to-end image compression and analysis model with Transformers, targeting to the cloud-based image classification application. Instead of placing an existing Transformer-based image classification model directly after an…

Computer Vision and Pattern Recognition · Computer Science 2021-12-20 Yuanchao Bai , Xu Yang , Xianming Liu , Junjun Jiang , Yaowei Wang , Xiangyang Ji , Wen Gao

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

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

Unsupervised image hashing, which maps images into binary codes without supervision, is a compressor with a high compression rate. Hence, how to preserving meaningful information of the original data is a critical problem. Inspired by the…

Computer Vision and Pattern Recognition · Computer Science 2022-01-17 Qinkang Gong , Liangdao Wang , Hanjiang Lai , Yan Pan , Jian Yin

Massive human-related data is collected to train neural networks for computer vision tasks. A major conflict is exposed relating to software engineers between better developing AI systems and distancing from the sensitive training data. To…

Computer Vision and Pattern Recognition · Computer Science 2023-06-07 Fusheng Hao , Fengxiang He , Yikai Wang , Fuxiang Wu , Jing Zhang , Jun Cheng , Dacheng Tao
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