Image watermarking capacity research is to study how much information can be hidden in an image. In watermarking schemes, watermarking can be viewed as a form of communication and image can be considered as a communication channel to transmit messages. Almost all previous works on watermarking capacity are based on information theory, using Shannon formula to calculate the capacity of watermarking. This paper presents a blind watermarking algorithm using Hopfield neural network, and analyze watermarking capacity based on neural network. Result shows that the attraction basin of associative memory decides watermarking capacity.
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