In this paper

we present a novel HVS-based visual masking and self-adaptive image public watermarking using chaotic array

and define a new noisesensitivity using forth-order cumulant in visual masking.In this algorithm

chaotic array is embedded to the sub-low frequency coefficients of the block-DCT

then visual masking is made according to the noisesensitivity.Under the affect of noisesensitivity

Visual masking accomplish self-adaptive controllable intensity of watermark.Without original image

we can remarkably detect the existence of watermark by public key.With common signal distortion or geometric distortion (such as lossy compress

cropping etc.)

watermark can achieve better robust.