This paper addresses the problem of head pose estimation with three degrees of freedom (pitch, yaw, roll) from a single image. Pose estimation is formulated as a high-dimensional to low-dimensional mixture of linear regression problem. We propose a method that maps HOG-based descriptors, extracted from face bounding boxes, to corresponding head poses. To account for errors in the observed bounding-box position, we learn regression parameters such that a HOG descriptor is mapped onto the union of a head pose and an offset, such that the latter optimally shifts the bounding box towards the actual position of the face in the image. The performance of the proposed method is assessed on publicly available datasets. The experiments that we carried out show that a relatively small number of locally-linear regression functions is sufficient to deal with the non-linear mapping problem at hand. Comparisons with state-of-the-art methods show that our method outperforms several other techniques.
REF used HOG features and a Gaussian locally-linear mapping model, learned using training data, to map the face descriptor onto the space of head poses and to predict angles of head rotation.
Head pose estimation via probabilistic high-dimensional regression
2015 IEEE International Conference on Image Processing (ICIP)
2015 IEEE International Conference on Image Processing (ICIP)
Computer Science