Digital Video Quality Metric Based on Watermarking Technique with Geffe Generator

This paper presents a proposed approach for assessing video quality without reference and makes use of a data hiding technique to embed a fragile mark into video frame by using Discreet Cosine Transform (DCT) and quantization. The fragile mark is random watermark generator using stream cipher based on Linear Feedback Shift Register (LFSR) and using Geffe generator to give a balanced distribution of zeros and ones in its output. The frame format consists of three color components, Red (R), Green (G) and Blue (B) for individual pixel, the watermark data should be hidden in Red (R) color channel to ensure the best recovery of the watermark . At the receiver, the mark is extracted from decoded video without any original reference video sequences. After extracted watermark, quality measure of the video is obtained by computing the degradation of the extracted mark. The results of this experiment indicate identical values of the Normalized Cross-correlation (NC) for three categories of real quality that have been proposed (good, low, bad) with the perceived quality. The experiment shows the error of the proposed system is 7% while correct ratio is 93% , the salt and pepper noise gives good results without errors while the Dust& Scratches noise gives highest error in the system. Results shown that the proposed algorithm provides a good estimation for the video quality when adding noise.