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Video restoration on a multiple TMS320C40 system
This application report describes a parallel video restoration system that restores old motion picture archives. A Gaussian-weighted, bi-directional, 3-D auto-regressive (B3D-AR) algorithm is used to alleviate the presence of noise in the old archives. Common forms of degradation found in such archives are "dirt and sparkle" and scratches. The distortion is caused either by the accumulation of dirt or by the film material being abraded. While most of the existing image restoration algorithms blur edges of moving objects in the vicinity of occluded and uncovered image regions, this algorithm is able to suppress mixed-noise processes and recover lost signals in both the covered and uncovered regions in an image sequence.
This video restoration system is tested on the artificially corrupted image sequences and naturally degraded video (full PAL image size). Samples of the original and corresponding restored image sequence are contained in this report. The B3D-AR algorithm is parallel-implemented on an array of 15 TI TMS320C40 digital signal processors that are connected in a tree configuration. Two different parallel algorithms are implemented in which a close-to-linear speed-up is achieved by means of a load-balanced parallel algorithm. This application is the winner of TI's 1995 $100,000 DSP Solutions Challenge. |
