1. A method for determining a quality index for a test video sequence, said method comprising: receiving, in a processor, a test video sequence; receiving, in said processor, a reference video sequence corresponding to said test video sequence; in said processor, calculating a spatial quality index using said test video sequence and said reference video sequence; in said processor, calculating a temporal quality index using said test video sequence and said reference video sequence; and in said processor, combining said spatial quality index and said temporal quality index to form a final quality index for said test video sequence.