Search Results for author: Marcella Astrid

Found 15 papers, 5 papers with code

Constricting Normal Latent Space for Anomaly Detection with Normal-only Training Data

no code implementations24 Mar 2024 Marcella Astrid, Muhammad Zaigham Zaheer, Seung-Ik Lee

During test time, since AE is not trained using real anomalies, it is expected to poorly reconstruct the anomalous data.

Anomaly Detection Video Anomaly Detection

LAA-Net: Localized Artifact Attention Network for High-Quality Deepfakes Detection

no code implementations24 Jan 2024 Dat Nguyen, Nesryne Mejri, Inder Pal Singh, Polina Kuleshova, Marcella Astrid, Anis Kacem, Enjie Ghorbel, Djamila Aouada

Second, an Enhanced Feature Pyramid Network (E-FPN) is proposed as a simple and effective mechanism for spreading discriminative low-level features into the final feature output, with the advantage of limiting redundancy.

DeepFake Detection Face Swapping +1

PseudoBound: Limiting the anomaly reconstruction capability of one-class classifiers using pseudo anomalies

no code implementations19 Mar 2023 Marcella Astrid, Muhammad Zaigham Zaheer, Seung-Ik Lee

Typically in OCC, an autoencoder (AE) is trained to reconstruct the normal only training data with the expectation that, in test time, it can poorly reconstruct the anomalous data.

One-Class Classification Video Anomaly Detection

Stabilizing Adversarially Learned One-Class Novelty Detection Using Pseudo Anomalies

no code implementations25 Mar 2022 Muhammad Zaigham Zaheer, Jin Ha Lee, Arif Mahmood, Marcella Astrid, Seung-Ik Lee

In the current study, we propose a robust anomaly detection framework that overcomes such instability by transforming the fundamental role of the discriminator from identifying real vs. fake data to distinguishing good vs. bad quality reconstructions.

Anomaly Detection Medical Diagnosis +1

Clustering Aided Weakly Supervised Training to Detect Anomalous Events in Surveillance Videos

no code implementations25 Mar 2022 Muhammad Zaigham Zaheer, Arif Mahmood, Marcella Astrid, Seung-Ik Lee

Formulating learning systems for the detection of real-world anomalous events using only video-level labels is a challenging task mainly due to the presence of noisy labels as well as the rare occurrence of anomalous events in the training data.

Clustering Representation Learning +2

Learning Not to Reconstruct Anomalies

1 code implementation19 Oct 2021 Marcella Astrid, Muhammad Zaigham Zaheer, Jae-Yeong Lee, Seung-Ik Lee

Typically, to tackle this problem, an autoencoder (AE) is trained to reconstruct the input with training set consisting only of normal data.

One-Class Classification Video Anomaly Detection

Deep Visual Anomaly detection with Negative Learning

no code implementations24 May 2021 Jin-ha Lee, Marcella Astrid, Muhammad Zaigham Zaheer, Seung-Ik Lee

However, these are trained with only normal data and at the test time, given abnormal data as input, may often generate normal-looking output.

Hallucination One-Class Classification

Cleaning Label Noise with Clusters for Minimally Supervised Anomaly Detection

no code implementations30 Apr 2021 Muhammad Zaigham Zaheer, Jin-ha Lee, Marcella Astrid, Arif Mahmood, Seung-Ik Lee

Learning to detect real-world anomalous events using video-level annotations is a difficult task mainly because of the noise present in labels.

Clustering Supervised Anomaly Detection +1

CLAWS: Clustering Assisted Weakly Supervised Learning with Normalcy Suppression for Anomalous Event Detection

no code implementations ECCV 2020 Muhammad Zaigham Zaheer, Arif Mahmood, Marcella Astrid, Seung-Ik Lee

The proposed method obtains83. 03% and 89. 67% frame-level AUC performance on the UCF Crime and ShanghaiTech datasets respectively, demonstrating its superiority over the existing state-of-the-art algorithms.

Clustering Event Detection +3

SmoothMix: A Simple Yet Effective Data Augmentation to Train Robust Classifiers

1 code implementation Conference on Computer Vision and Pattern Recognition (CVPR) Workshops 2020 Jin-ha Lee, Muhammad Zaigham Zaheer, Marcella Astrid, Seung-Ik Lee

Data augmentation has been proven effective which, by preventing overfitting, can not only enhances the performance of a deep neural network but also leads to a better generalization even with limited dataset.

Data Augmentation Image Classification

Small Object Detection using Context and Attention

no code implementations13 Dec 2019 Jeong-Seon Lim, Marcella Astrid, Hyun-Jin Yoon, Seung-Ik Lee

We propose an object detection method using context for improving accuracy of detecting small objects.

Object object-detection +1

Rank Selection of CP-decomposed Convolutional Layers with Variational Bayesian Matrix Factorization

no code implementations16 Jan 2018 Marcella Astrid, Seung-Ik Lee, Beom-Su Seo

One of the method to compress CNNs is compressing the layers iteratively, i. e. by layer-by-layer compression and fine-tuning, with CP-decomposition in convolutional layers.

Image Classification

CP-decomposition with Tensor Power Method for Convolutional Neural Networks Compression

2 code implementations25 Jan 2017 Marcella Astrid, Seung-Ik Lee

Convolutional Neural Networks (CNNs) has shown a great success in many areas including complex image classification tasks.

General Classification Image Classification

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