Most RGB-D based research focuses on gesture analysis, scene reconstruction and SLAM, but only few study its impacts on face recognition. A common yet challenging scenario considered in face recognition across pose takes a single 2D face of frontal pose as the galley and other poses as the probe set. We consider a similar scenario but with a RGB-D image pair taken at frontal pose in the gallery, only 2D images with a large scope of poses in the probe set, and study the advantage of the additional depth map on top of the regular RGB image. We formulate the 3D face reconstruction using the RGB-D image as a constrained optimization, and compare the results with different reconstruction settings. The reconstructed 3D face allows the generation of 2D face with specific poses, which can be matched with the probes. Experiments on the Biwi Kinect Head Pose Database and Eurecom Database show that the additional depth map substantially improves the crosspose recognition performance, and the depth-based component selection also improves the recognition under occlusion and expression variation.

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SUMMARYFace recognition across pose is generally tackled by either 2D based or 3D based approaches. The 2D-based often require a training set from which the cross-pose multi-view relationship can be learned and applied for recognition. The 3D based are mostly composed of 3D surface reconstruction of each gallery face, synthesis of 2D images of novel views using the reconstructed model, and match of the synthesized images to the probes. The depth information provides crucial information for arbitrary poses but more methods are yet to be developed. Extended from a latest face reconstruction method using a single 3D reference model and a frontal registered face, this study focuses on using the reconstructed 3D face for recognition. The recognition performance varies with poses, the closer to the front, the better. Several ways to improve the performance are attempted, including different numbers of fiducial points for alignment, multiple reference models considered in the reconstruction phase, and both frontal and profile poses available in the gallery. These attempts make this approach competitive to the state-of-the-art methods.

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