Enhanced signal to error ratio in digital image watermarking using Wavelet Packet Transform

Digital image watermarking plays an important role in Multimedia security field. Methods developed under this are used to protect Intellectual property rights of digital data such as video, image, audio, etc. without affecting the fidelity of the original data. In this paper a Wavelet based digital image watermarking is applied on input `.bmp´ image to generate watermark embedded image by inserting a logo `.bmp´ image with non zero scaling factor. A compactly supported Daubechies Orthonormal Wavelet Transform (dB) method and wavelet packet transform method are used. Extracted logo image and received image after both watermarking process are analysed in terms of signal to error ratio. Effect of various scaling factors can be seen on the values of signal to error ratio (SER) for both received output image and extracted logo image. It has been found that there is significant increase in SER (4.84dB to 5.35dB) observed for received output image in the case of Wavelet Packet Transform.