A DCT-based Watermarking Algorithm for Color Images
Dongjian He · Microelectronics & Computer · 2007
In this paper, a DCT-based watermarking algorithm for color images was proposed. The watermark was embedded into original color image by identifying which DCT coefficient of green components. The original binary watermark image was firstly encrypted through scrambling technique, and then embedded into DCT mid-band frequency coefficient of green components. And the watermark can also be detected with the original image from watermarked image when needed. The experiment results demonstrate that the algorithm is imperceptible and very robust to attacks such as JPEG compression, cropping, additive noise and enhancement.