Spatial Domain Blind Watermarking for Digital Images

摘要

In modern technological world, digital manipulation of images and video data has become very common. It is required to bring out some mechanism to protect copyright and authentication of digital data. In this work, a new blind digital watermarking algorithm is proposed for protecting copyright of digital images. In this work, embedding process is carried out in spatial domain by modifying luminance components of cover images. The cover image is divided into many blocks of size 8x8, and its correlation values are used as key in selecting blocks for inserting watermark. The image to be watermarked is called host image, and it could be in color or grayscale format. The secret data to be inserted is called watermark, and it is considered to be in monochrome format of size 32 X 32 bytes. This paper shows a novel approach in inserting a watermark in spatial domain. The obtained results show the efficiency of the proposed approach, and it could be classified as fragile watermarking.