Performance Comparison of Wavelet Transform Based Watermarking and DCT Transform Based Watermarking

Wavelet 변환과 DCT 변환을 이용한 워터마킹에 관한 연구

With the rapid growth of network distributions of digitized media(audio, image, and video), there is an urgent need for copyright protection. For now watermarking is a well-known technique for copyright protection of digital data. To embed a digital watermark to the image, discrete cosine transform(DCT) and wavelet transform are commonly used. In this paper, the performance of the DCT based watermarking technique and wavelet based watermarking technique were compared and the influences of the parameter a that decides the strength of the watermarking data were considered.