There are two ways for transmitting data in a secure manner: Cryptography and steganography. Digital watermarking is a
specific branch of steganography, which can be used in various applications, including covert communication, owner
identification, authentication and copy control. In this paper, we proposed a blind adaptive watermarking algorithm
based on HVS is proper for covert communication. The secret information that can be seen as a watermarking is hidden
into a host image, which can be publicly accessed, so the transportation of the secret information will not attract the
attention of illegal receiver. With our approach, the secret information is embedded in the wavelet domain. By the
background luminance and the texture mask characters of HVS, we divide the wavelet coefficients of carrier image into
different classes. According to the classes of the wavelet coefficients the watermark image is embedded. The result of
our experimental shows that this approach is imperceptible and robust some image processing such as JPEG lossy
compression, cropping, median filtering, grads sharpening, Gaussian white noise attacks and so on.
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