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High-zoom video hallucination by exploiting spatio-temporal regularities

In this paper, we consider the problem of super-resolving a human face video by a very high (/spl times/ 16) zoom factor. Inspired by the literature on hallucination and example-based learning, we formulate this task using a graphical model that encodes, (1) spatio-temporal consistencies, and (2) image formation & degradation processes. A video database of facial expressions is used to learn a domain-specific prior for high-resolution videos. The problem is posed as one of probabilistic inference, in which we aim to find the high-resolution video that satisfies the constraints expressed through the graphical model. Traditional approaches to this problem using video data first estimate the relative motion between frames and then compensate for it, and effectively resulting in multiple measurements of the scene. Our use of time is rather direct, we define data structures that span multiple consecutive frames enriching our feature vectors with a temporal signature. We then exploit these signatures to find consistent solutions over time. In our experiments, an 8/spl times/6 pixel-wide face video, subject to translational jitter and additive noise, gets magnified to a 128/spl times/96 pixel video. Our results show that by exploiting both space and time, drastic improvements can be achieved in both video flicker artifacts and mean-squared-error.