Multiple image watermarking is an advanced concept of singular techniques. The existing digital techniques cannot obtain all the design goals, such as imperceptibility, robustness, security, and capacity simultaneously with perfection. Hence, multiple technique designed that embeds several watermarks into same host for conveying information. This paper proposed a Discrete Cosine Transform (DCT)...

Digital image watermarking is the insertion of watermarks into digital media. Several types methods used are Discrete Cosine Transform (DCT) and Fourier (DFT). Both these work in frequency domain (transform). using carried out on coefficient. This study 30 data as material for watermaking analysis with 10 each binary, grayscale color images jpg, png bmp formats. binary domains conversions from ...

The discrete Fourier-cosine transform (cos-DFT), the discrete Fourier-sine transform (sin-DFT) and the discrete cosine transform (DCT) are closely related to the discrete Fourier transform (DFT) of real-valued sequences. This paper describes a general method for constructing fast algorithms for the cos-DFT, the sin-DFT and the DCT, which is based on polynomial arithmetic with Chebyshev polynomi...