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Image-based re-identification of animal individuals allows gathering of information such as migration patterns of the animals over time. This, together with large image volumes collected using camera traps and crowdsourcing, opens novel…

Computer Vision and Pattern Recognition · Computer Science 2023-08-15 Veikka Immonen , Ekaterina Nepovinnykh , Tuomas Eerola , Charles V. Stewart , Heikki Kälviäinen

In this paper, pelage pattern matching is considered to solve the individual re-identification of the Saimaa ringed seals. Animal re-identification together with the access to large amount of image material through camera traps and…

Computer Vision and Pattern Recognition · Computer Science 2021-08-25 Ilia Chelak , Ekaterina Nepovinnykh , Tuomas Eerola , Heikki Kälviäinen , Igor Belykh

We propose a method for Saimaa ringed seal (Pusa hispida saimensis) re-identification. Access to large image volumes through camera trapping and crowdsourcing provides novel possibilities for animal monitoring and conservation and calls for…

Computer Vision and Pattern Recognition · Computer Science 2022-06-22 Ekaterina Nepovinnykh , Ilia Chelak , Tuomas Eerola , Heikki Kälviäinen

Wildlife camera traps and crowd-sourced image material provide novel possibilities to monitor endangered animal species. However, massive image volumes that these methods produce are overwhelming for researchers to go through manually which…

Computer Vision and Pattern Recognition · Computer Science 2022-06-08 Ekaterina Nepovinnykh , Tuomas Eerola , Vincent Biard , Piia Mutka , Marja Niemi , Heikki Kälviäinen , Mervi Kunnasranta

Human re-rendering from a single image is a starkly under-constrained problem, and state-of-the-art algorithms often exhibit undesired artefacts, such as over-smoothing, unrealistic distortions of the body parts and garments, or implausible…

Computer Vision and Pattern Recognition · Computer Science 2021-01-12 Kripasindhu Sarkar , Dushyant Mehta , Weipeng Xu , Vladislav Golyanik , Christian Theobalt

Visual identification of individual animals that bear unique natural body markings is an important task in wildlife conservation. The photo databases of animal markings grow larger and each new observation has to be matched against…

Computer Vision and Pattern Recognition · Computer Science 2019-03-01 Olga Moskvyak , Frederic Maire , Asia O. Armstrong , Feras Dayoub , Mahsa Baktashmotlagh

Wildlife re-identification aims to recognise individual animals by matching query images to a database of previously identified individuals, based on their fine-scale unique morphological characteristics. Current state-of-the-art models for…

Computer Vision and Pattern Recognition · Computer Science 2026-03-05 Thanos Polychronou , Lukáš Adam , Viktor Penchev , Kostas Papafitsoros

This study introduces a new framework for 3D person re-identification (re-ID) that leverages readily available high-resolution texture data in 3D reconstruction to improve the performance and explainability of the person re-ID task. We…

Computer Vision and Pattern Recognition · Computer Science 2024-12-10 Huy Nguyen , Kien Nguyen , Akila Pemasiri , Sridha Sridharan , Clinton Fookes

We present the first method to perform automatic 3D pose, shape and texture capture of animals from images acquired in-the-wild. In particular, we focus on the problem of capturing 3D information about Grevy's zebras from a collection of…

Computer Vision and Pattern Recognition · Computer Science 2019-09-18 Silvia Zuffi , Angjoo Kanazawa , Tanya Berger-Wolf , Michael J. Black

Camera traps are revolutionising wildlife monitoring by capturing vast amounts of visual data; however, the manual identification of individual animals remains a significant bottleneck. This study introduces a fully self-supervised approach…

Computer Vision and Pattern Recognition · Computer Science 2025-07-15 Vladimir Iashin , Horace Lee , Dan Schofield , Andrew Zisserman

Dressed people reconstruction from images is a popular task with promising applications in the creative media and game industry. However, most existing methods reconstruct the human body and garments as a whole with the supervision of 3D…

Computer Vision and Pattern Recognition · Computer Science 2023-03-03 Yue Shi , Yuxuan Xiong , Jingyi Chai , Bingbing Ni , Wenjun Zhang

Parametric models of humans, faces, hands and animals have been widely used for a range of tasks such as image-based reconstruction, shape correspondence estimation, and animation. Their key strength is the ability to factor surface…

Computer Vision and Pattern Recognition · Computer Science 2020-07-23 Keyang Zhou , Bharat Lal Bhatnagar , Gerard Pons-Moll

Re-identification of individual animals in images can be ambiguous due to subtle variations in body markings between different individuals and no constraints on the poses of animals in the wild. Person re-identification is a similar task…

Computer Vision and Pattern Recognition · Computer Science 2020-01-10 Olga Moskvyak , Frederic Maire , Feras Dayoub , Mahsa Baktashmotlagh

Biologists have long combined visuals with textual field notes to re-identify (Re-ID) animals. Contemporary AI tools automate this for species with distinctive morphological features but remain largely image-based. Here, we extend Re-ID…

Computer Vision and Pattern Recognition · Computer Science 2025-12-18 Wenshuo Li , Majid Mirmehdi , Tilo Burghardt

Wildlife re-identification aims to match individuals of the same species across different observations. Current state-of-the-art (SOTA) models rely on class labels to train supervised models for individual classification. This dependence on…

Computer Vision and Pattern Recognition · Computer Science 2025-07-04 Mufhumudzi Muthivhi , Terence L. van Zyl

The recent person re-identification research has achieved great success by learning from a large number of labeled person images. On the other hand, the learned models often experience significant performance drops when applied to images…

Computer Vision and Pattern Recognition · Computer Science 2022-10-04 Changgong Zhang , Fangneng Zhan

Monocular 3D animal reconstruction is challenging due to complex articulation, self-occlusion, and fine-scale details such as fur. Existing methods often produce distorted geometry and inconsistent textures due to the lack of articulated 3D…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Shufan Sun , Chenchen Wang , Zongfu Yu

This paper presents a novel framework to recover \emph{detailed} avatar from a single image. It is a challenging task due to factors such as variations in human shapes, body poses, texture, and viewpoints. Prior methods typically attempt to…

Computer Vision and Pattern Recognition · Computer Science 2021-08-21 Hao Zhu , Xinxin Zuo , Haotian Yang , Sen Wang , Xun Cao , Ruigang Yang

Self-supervised learning has become a popular way to pretrain a deep learning model and then transfer it to perform downstream tasks. However, most of these methods are developed on large-scale image datasets that contain natural objects…

Computer Vision and Pattern Recognition · Computer Science 2024-01-12 Kevin Van Vorst , Li Shen

We address the problem of fitting 3D human models to 3D scans of dressed humans. Classical methods optimize both the data-to-model correspondences and the human model parameters (pose and shape), but are reliable only when initialized close…

Computer Vision and Pattern Recognition · Computer Science 2021-11-29 Bharat Lal Bhatnagar , Cristian Sminchisescu , Christian Theobalt , Gerard Pons-Moll
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