Search Results for author: Victor Sanchez

Found 26 papers, 12 papers with code

CLIP-EBC: CLIP Can Count Accurately through Enhanced Blockwise Classification

1 code implementation14 Mar 2024 Yiming Ma, Victor Sanchez, Tanaya Guha

The CLIP (Contrastive Language-Image Pretraining) model has exhibited outstanding performance in recognition problems, such as zero-shot image classification and object detection.

Crowd Counting

Data-Agnostic Face Image Synthesis Detection Using Bayesian CNNs

no code implementations8 Jan 2024 Roberto Leyva, Victor Sanchez, Gregory Epiphaniou, Carsten Maple

Face image synthesis detection is considerably gaining attention because of the potential negative impact on society that this type of synthetic data brings.

Anomaly Detection Image Generation

Detecting Face Synthesis Using a Concealed Fusion Model

no code implementations8 Jan 2024 Roberto Leyva, Victor Sanchez, Gregory Epiphaniou, Carsten Maple

In this paper, we propose a fusion-based strategy to detect face image synthesis while providing resiliency to several attacks.

Computer Security Face Generation +1

Cross-Age Contrastive Learning for Age-Invariant Face Recognition

1 code implementation18 Dec 2023 Haoyi Wang, Victor Sanchez, Chang-Tsun Li

Cross-age facial images are typically challenging and expensive to collect, making noise-free age-oriented datasets relatively small compared to widely-used large-scale facial datasets.

Age-Invariant Face Recognition Contrastive Learning +1

Look at Adjacent Frames: Video Anomaly Detection without Offline Training

no code implementations27 Jul 2022 Yuqi Ouyang, Guodong Shen, Victor Sanchez

Based on the information shifts between adjacent frames, an incremental learner is used to update parameters of the multilayer perceptron after observing each frame, thus allowing to detect anomalous events along the video stream.

Anomaly Detection Video Anomaly Detection

Visually-aware Acoustic Event Detection using Heterogeneous Graphs

1 code implementation16 Jul 2022 Amir Shirian, Krishna Somandepalli, Victor Sanchez, Tanaya Guha

In contrast, we employ heterogeneous graphs to explicitly capture the spatial and temporal relationships between the modalities and represent detailed information about the underlying signal.

Event Detection

FusionCount: Efficient Crowd Counting via Multiscale Feature Fusion

1 code implementation28 Feb 2022 Yiming Ma, Victor Sanchez, Tanaya Guha

Then, to account for perspective distortion, the highest-level feature map is fed to extra components to extract multiscale features, which are the input to the decoder to generate crowd densities.

Crowd Counting

Spectral-PQ: A Novel Spectral Sensitivity-Orientated Perceptual Compression Technique for RGB 4:4:4 Video Data

no code implementations24 Jan 2022 Lee Prangnell, Victor Sanchez

With application for RGB 4:4:4 video data, Spectral-PQ exploits HVS spectral sensitivity-related color masking in addition to spatial masking and temporal masking; the proposed method operates at the Coding Block (CB) level and the Prediction Unit (PU) level in the HEVC standard.

Quantization

Improving Face-Based Age Estimation with Attention-Based Dynamic Patch Fusion

no code implementations19 Dec 2021 Haoyi Wang, Victor Sanchez, Chang-Tsun Li

Since the proposed RMHHA mechanism ranks the discovered patches based on their importance, the length of the learning path of each patch in the FusionNet is proportional to the amount of information it carries (the longer, the more important).

Age Estimation

Joint Learning Architecture for Multiple Object Tracking and Trajectory Forecasting

1 code implementation24 Aug 2021 Oluwafunmilola Kesa, Olly Styles, Victor Sanchez

We propose to jointly train a tracking and trajectory forecasting model and use the predicted trajectory forecasts for short-term motion estimates in lieu of linear motion prediction methods such as the Kalman filter.

motion prediction Multiple Object Tracking +1

Multi-Camera Trajectory Forecasting with Trajectory Tensors

1 code implementation10 Aug 2021 Olly Styles, Tanaya Guha, Victor Sanchez

We introduce the problem of multi-camera trajectory forecasting (MCTF), which involves predicting the trajectory of a moving object across a network of cameras.

Trajectory Forecasting

On the detection-to-track association for online multi-object tracking

no code implementations1 Jul 2021 Xufeng Lin, Chang-Tsun Li, Victor Sanchez, Carsten Maple

Driven by recent advances in object detection with deep neural networks, the tracking-by-detection paradigm has gained increasing prevalence in the research community of multi-object tracking (MOT).

Multi-Object Tracking object-detection +2

Deep Learning for Predictive Analytics in Reversible Steganography

no code implementations13 Jun 2021 Ching-Chun Chang, Xu Wang, Sisheng Chen, Isao Echizen, Victor Sanchez, Chang-Tsun Li

Given that reversibility is governed independently by the coding module, we narrow our focus to the incorporation of neural networks into the analytics module, which serves the purpose of predicting pixel intensities and a pivotal role in determining capacity and imperceptibility.

Video Anomaly Detection by Estimating Likelihood of Representations

1 code implementation2 Dec 2020 Yuqi Ouyang, Victor Sanchez

Video anomaly detection is a challenging task not only because it involves solving many sub-tasks such as motion representation, object localization and action recognition, but also because it is commonly considered as an unsupervised learning problem that involves detecting outliers.

Action Recognition Anomaly Detection +4

Age-Oriented Face Synthesis with Conditional Discriminator Pool and Adversarial Triplet Loss

no code implementations1 Jul 2020 Haoyi Wang, Victor Sanchez, Chang-Tsun Li

In this paper, we propose a method for the age-oriented face synthesis task that achieves a high synthesis accuracy with strong identity permanence capabilities.

Face Generation

Ensemble Network for Ranking Images Based on Visual Appeal

1 code implementation6 Jun 2020 Sachin Singh, Victor Sanchez, Tanaya Guha

The ranking is expected to correspond with human perception of overall appeal of the images.

HVS-Based Perceptual Color Compression of Image Data

no code implementations16 May 2020 Lee Prangnell, Victor Sanchez

In the evaluations, we compare the proposed PCC technique with a set of reference methods including Versatile Video Coding (VVC) and High Efficiency Video Coding (HEVC) in addition to two other recently proposed algorithms.

MS-SSIM Quantization +1

Multi-Camera Trajectory Forecasting: Pedestrian Trajectory Prediction in a Network of Cameras

1 code implementation1 May 2020 Olly Styles, Tanaya Guha, Victor Sanchez, Alex Kot

To facilitate research in this new area, we release the Warwick-NTU Multi-camera Forecasting Database (WNMF), a unique dataset of multi-camera pedestrian trajectories from a network of 15 synchronized cameras.

Pedestrian Trajectory Prediction Trajectory Forecasting

Multiple Object Forecasting: Predicting Future Object Locations in Diverse Environments

1 code implementation26 Sep 2019 Olly Styles, Tanaya Guha, Victor Sanchez

In contrast to existing works on object trajectory forecasting which primarily consider the problem from a birds-eye perspective, we formulate the problem from an object-level perspective and call for the prediction of full object bounding boxes, rather than trajectories alone.

Multiple Object Forecasting Object +1

Forecasting Pedestrian Trajectory with Machine-Annotated Training Data

1 code implementation9 May 2019 Olly Styles, Arun Ross, Victor Sanchez

In this work, we present a deep learning approach for pedestrian trajectory forecasting using a single vehicle-mounted camera.

Pedestrian Detection Trajectory Forecasting

Fusion Network for Face-based Age Estimation

no code implementations27 Jul 2018 Haoyi Wang, Xingjie Wei, Victor Sanchez, Chang-Tsun Li

Convolutional Neural Networks (CNN) have been applied to age-related research as the core framework.

Age Estimation MORPH

The Predictive Context Tree: Predicting Contexts and Interactions

no code implementations5 Oct 2016 Alasdair Thomason, Nathan Griffiths, Victor Sanchez

The Predictive Context Tree (PCT) is constructed as a hierarchical classifier, capable of predicting both the future locations that a user will visit and the contexts that a user will be immersed within.

Context Trees: Augmenting Geospatial Trajectories with Context

no code implementations14 Jun 2016 Alasdair Thomason, Nathan Griffiths, Victor Sanchez

Summarising user contexts into a single data structure gives easy access to information that would otherwise remain latent, providing the basis for better understanding and predicting the actions and behaviours of individuals and groups.

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