Face hallucination is super-resolution of face images, or clarifying the details of a face from a low-resolution image. The technique of sparse coding can be used. Because of the importance of face images in facial recognition systems and other applications, face hallucination has become an area of research.
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“No more distressing moment can ever face a British government than that which requires it to come to a hard, fast and specific decision.”
—Barbara Tuchman (1912–1989)