研究目的
To address the lack of labeled thermal infrared images for training machine learning algorithms in facial analysis tasks by introducing a high-resolution thermal facial image database with extensive manual annotations.
研究成果
The study demonstrates that providing a large number of labeled thermal infrared images allows the application of current image processing methods to facial analysis tasks in the thermal domain. Learning-based approaches outperform algorithm-based methods in terms of robustness and accuracy. The database enables the training of advanced methods like deep learning for tasks such as facial landmark detection and expression recognition.
研究不足
The database does not include images of persons wearing glasses or data from the visible spectrum, which may limit its applicability in scenarios requiring such data. Additionally, the database uses a thermally neutral backdrop, which may not reflect real-world conditions with unconstrained backgrounds.
1:Experimental Design and Method Selection:
The study introduces a high-resolution thermal facial image database with manual annotations for facial landmarks and emotion labels. It explores the adaptation of methods from the visual domain for infrared images and extends existing approaches for infrared landmark detection with head pose estimation.
2:Sample Selection and Data Sources:
The database contains 2935 images of 90 subjects, divided into sequences for different tasks such as head movement patterns, facial action units, basic emotions, and free movements.
3:List of Experimental Equipment and Materials:
An Infratec HD820 high-resolution thermal infrared camera with a 1024 × 768 pixel-sized microbolometer sensor was used for recording.
4:Experimental Procedures and Operational Workflow:
Subjects were filmed while sitting at a distance of 0.9 m to the camera against a thermally neutral backdrop. Selected frames were exported for annotation.
5:9 m to the camera against a thermally neutral backdrop. Selected frames were exported for annotation.
Data Analysis Methods:
5. Data Analysis Methods: The performance of machine learning algorithms for facial landmark detection and facial expression recognition was evaluated using leave-one-subject-out-cross-validation.
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