Many software systems allow image creation and design using innovative design and graphic techniques. The pairwise relation is being used as binary delta function. The human eye has only limited capability to state the variation and it can be overcome by. An effective digital watermark should be perceptually invisible to prevent obstruction of the original image.
This chapter presents a brief introduction of digital watermarking , classification, important characteristics and recent applications of digital watermarks followed by the essential requirements. Fragile watermarks are commonly used for tamper detection (integrity proof).
A digital watermark is called fragile if it fails to be detectable after the slightest modification. The application includes digital signatures, fingerprinting, broadcast and publication monitoring, copy control, authentication, and secret communication. This project implemented a digital watermarking algorithm for 3D Meshes based on spectral domain spectral coefficient perturbation. In addition, based on previous studies, the original algorithm is improved from watermark generation, watermark capacity and robustness against smooth attacks.