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| Face hallucination is to synthesize high-resolution face image from the input low-resolution one. Although many two-step learning-based face hallucination approaches have been developed, they suffer from the expensive computational cost due to the separate calculation of the global and local models. To overcome this problem, we propose a correlative two-step learning-based face hallucination approach which bridges the gap between the global model and the local model. In the global phase, we build a global face hallucination framework by combining the steerable pyramid decomposition and the reconstruction. In the residue compensation phase, based on the combination weights and constituent samples obtained in the global phase, a residue face image is synthesized by the neighbor reconstruction algorithm to compensate the hallucinated global face image with detailed facial features. The ultimate hallucinated face image is the composition of the global face image and the residue face image. Compared with existing approaches, in the global phase, our global face image is more similar to the original high-resolution face image. Moreover, in the residue compensation phase, we use the combination weights and constituent samples obtained in the global phase to compute the residue face image, by which the computational complexity can be greatly reduced without compromising the quality of facial details. The experimental results and comparisons demonstrate that our approach can not only synthesize distinct high-resolution face images efficiently, but also has high computational efficiency. |
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| Keywords:Face hallucination; Super-resolution; Steerable pyramid; Image patch; Global linear smoothing operator |
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