Hermite expansion method for the image watermarking

Abstract

In the paper, an image watermark procedure based on Hermite projection method is presented. The watermark is embedded into the coefficients used for the Hermite expansion. Different number of the Hermite function is chosen for the image reconstruction and at the same time, watermark embedding. Therefore, image compression and watermarking is done within the same procedure. This enables the protection of copyrights for different applications that demand the image compression, data and recording protection which are transferred via Internet. The theory is proved with the experimental result. Image is reconstructed by using different number of Hermite functions. Image quality is proved by measuring Peak signal-to-noise ratio (PSNR) and watermark detection performance is tested by observing standard correlator response.