A Brief Analysis on Detection Standard of Digital Watermark

The correlation coefficient is researched in digital watermark algorithm.The relaticon between the correlation coefficient and the bit error rates of watermark detection is found.The detection threshold and wrong probability can be calculated out directly by the relation.Furthermore,a method to calculate detection coefficient is proposed.This method can increase the threshold of detection while keeping the probability of the false detection not to change and can enable the detection to strengthen the responses of the correct watermark data.