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Are we SMPLy biased
Identifying ethical biases in Action Recognition
Human Action Recognition (HAR) models are increasingly deployed in high-stakes environments, yet their fairness across different human appearances has not been analyzed. We introduce a framework for auditing bias in HAR models using synthetic video data, generated with full control over visual identity attributes such as skin color. Unlike prior work that focuses on static images or pose estimation, our approach preserves temporal consistency, allowing us to isolate and test how changes to a single attribute affect model predictions. Through controlled interventions using the BEDLAM simulation platform, we show whether some popular HAR models exhibit statistically significant biases on the skin color even when the motion remains identical. Our results highlight how models may encode unwanted visual associations, and we provide evidence of systematic errors across groups. This work contributes a framework for auditing HAR models and supports the development of more transparent, accountable systems in light of upcoming regulatory standards.
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Human Action Recognition (HAR) models are increasingly deployed in high-stakes environments, yet their fairness across different human appearances has not been analyzed. We introduce a framework for auditing bias in HAR models using synthetic video data, generated with full control over visual identity attributes such as skin color. Unlike prior work that focuses on static images or pose estimation, our approach preserves temporal consistency, allowing us to isolate and test how changes to a single attribute affect model predictions. Through controlled interventions using the BEDLAM simulation platform, we show whether some popular HAR models exhibit statistically significant biases on the skin color even when the motion remains identical. Our results highlight how models may encode unwanted visual associations, and we provide evidence of systematic errors across groups. This work contributes a framework for auditing HAR models and supports the development of more transparent, accountable systems in light of upcoming regulatory standards.
Instance segmentation on data from Dynamic Vision Sensors (DVS) is an important computer vision task that needs to be tackled in order to push the research forward on these types of inputs. This paper aims to show that deep learning based techniques can be used to solve the task of instance segmentation on DVS data. A high performing model was used to solve this task, using event-based data that was transformed into RGB-D images. The chosen model for this work was Mask R-CNN, with an alteration for depth images, because of its high performance on frame based data. The N-MNIST dataset provides the event-based input, and the transformation of such an input is presented in this study. Furthermore, the masks are generated with the help of the MNIST dataset and heuristics are used for placing them at the correct positions. The results are promising and comparable to other results from literature on the task of semantic segmentation.
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Instance segmentation on data from Dynamic Vision Sensors (DVS) is an important computer vision task that needs to be tackled in order to push the research forward on these types of inputs. This paper aims to show that deep learning based techniques can be used to solve the task of instance segmentation on DVS data. A high performing model was used to solve this task, using event-based data that was transformed into RGB-D images. The chosen model for this work was Mask R-CNN, with an alteration for depth images, because of its high performance on frame based data. The N-MNIST dataset provides the event-based input, and the transformation of such an input is presented in this study. Furthermore, the masks are generated with the help of the MNIST dataset and heuristics are used for placing them at the correct positions. The results are promising and comparable to other results from literature on the task of semantic segmentation.