A state-space super-resolution approach for video reconstruction

摘要

The main objective of super-resolution video reconstruction is to make use of a set of low-resolution image frames to produce their respective counterparts with higher resolution. The conventional two-equation-based Kalman filter only considers the information from the previously reconstructed high-resolution frame and the currently observed low-resolution frame for producing each high-resolution frame. It has been observed that the information inherited in the previously observed low-resolution frame could be beneficial on the reconstruction of the super-resolution video. For that, an extra observation equation is incorporated into the framework of the conventional two-equation-based Kalman filtering in this paper to establish a three-equation-based state-space approach as a more generalized framework. The closed-form solution is mathematically derived, and extensive simulations using both artificially degraded and real-life image sequences are conducted to demonstrate its superior performance. Furthermore, a unified theoretical analysis is provided to analyze the relationship between the proposed framework and two existing super-resolution approaches, the sliding-window-based Bayesian estimation approach and the conventional two-equation-based Kalman filtering, respectively.