Performance Evaluation of Multiple Watermarks System

A multiple watermarking algorithm based on the code division multiple access (CDMA) technique is presented. According to the multiple accessing technique of the CDMA system, multiple copyright identifiers are embedded into digital images. Performance evaluation of this multiple watermarks system are presented. This paper proposed a analysis of multiple watermarks system capacity. When two watermarks are embedded in an image at the same time, the capacity is larger than the capacity when the single watermark is embedded, and is smaller than the sum of the capacity of two watermarks are embedded respectively. Bit error rate (BER) performance of multiple watermarks system is also evaluated.