In this algorithm, speech watermark information is divided into two portions and then inserted into wavelet coefficients of red channel and blue channel of the color face image.
In this algorithm, multiple watermark logos are inserted into LH and HL subbands of the host image.
Transmitter part performs the coding and watermark embedding in the cover image.
They include one spatial domain technique and three transform domain watermark embedding techniques.
We select the primitives to watermark
as the way mentioned before.
can prevent illegal regeneration of copies of the marked data.
In a closed system in which the multimedia content needs special hardware for copying and viewing, a digital watermark
can be inserted to indicate the number of copies permitted.
Due to its excellent spatio-frequency localization properties, the DWT is very suitable to identify areas in the host image where a watermark
can be embedded effectively.
insertion generally results in image quality degradation.
detection is achieved through comparison with the original un-watermarked
One by-product of this process is the watermark
- the technique of impressing into the paper a form, image, or text derived from the negative in the mold, as the paper fibers are squeezed and dried.