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Human Pose Descriptions and Subject-Focused Attention for Improved Zero-Shot Transfer in Human-Centric Classification Tasks

11 Mar 2024arXiv:2403.06904archive 2025-07-28

Muhammad Saif Ullah Khan, Muhammad Ferjad Naeem, Federico Tombari, Luc van Gool, Didier Stricker, Muhammad Zeshan Afzal

We present a novel LLM-based pipeline for creating contextual descriptions of human body poses in images using only auxiliary attributes. This approach facilitates the creation of the MPII Pose Descriptions dataset, which includes natural language annotations for 17,367 images containing people engaged in 410 distinct activities. We demonstrate the effectiveness of our pose descriptions in enabling zero-shot human-centric classification using CLIP. Moreover, we introduce the FocusCLIP framework, which incorporates Subject-Focused Attention (SFA) in CLIP for improved text-to-image alignment. Our models were pretrained on the MPII Pose Descriptions dataset and their zero-shot performance was evaluated on five unseen datasets covering three tasks. FocusCLIP outperformed the baseline CLIP model, achieving an average accuracy increase of 8.61\% (33.65\% compared to CLIP's 25.04\%). Notably, our approach yielded improvements of 3.98\% in activity recognition, 14.78\% in age classification, and 7.06\% in emotion recognition. These results highlight the potential of integrating detailed pose descriptions and subject-level guidance into general pretraining frameworks for enhanced performance in downstream tasks.

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Tasks

Activity RecognitionAge ClassificationEmotion Recognition

Datasets

Introduced by this paper, per the archive.

MPII Human Pose Descriptions

Results from the paper archive 2025-07-28

TaskDatasetModelMetricValueRank at snapshotLeaderboardReport
Activity Recognition Stanford40 FocusCLIP Top-3 Accuracy (%) 10.47 #1 of 2 Archive leaderboard report
Activity Recognition Stanford40 CLIP Top-3 Accuracy (%) 6.49 #2 of 2 Archive leaderboard report
Emotion Recognition EMOTIC FocusCLIP Top-3 Accuracy (%) 13.73 #2 of 2 Archive leaderboard report

Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.

Methods

CLIP

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