Watermarking helps in ensuring originality, ownership and copyrights of a digital image. This paper aims at embedding a Watermark in an image using Wave Atom Transform. Preference of Wave Atoms on other transformations has been due to its sparser expansion, adaptability to the direction of local pattern, and sharp frequency localization. In this scheme, we had tried to spread the watermark in an image so that the information at one place is very small and undetectable. In order to extract the watermark and verify ownership of an image, one would have the advantage of prior knowledge of embedded locations. A noise of high amplitude will be needed to be added to the image for watermark distortion. Furthermore, the information spread will ensure the robustness of the watermark data. The proposed scheme has the ability to withstand malicious operations and attacks.
A digital watermark is generally understood as a kind of marker embedded in a digital object (such as an image, text, video, or audio file), typically used to indicate ownership and/or to prevent unauthorized use. For images, the watermark is often a text layer or image identifying the owner of the digital object.
AtoM supports basic digital watermarking functionality for images and text files such as PDFs, since the preview image (aka the reference display copy) for a text file is a JPG image. The watermark does not alter or affect the master digital object. Similarly, thumbnail images, used in search and browse results, are also unaffected. Only the reference display copy, used on the view page of an archival description, will show the watermark.
AtoM’s default behavior is to composite (a.k.a. “tile”) new reference images with the watermark file. For best results, we recommend using a format for your watermark that supports alpha compositing, such as a PNG image file. The watermark will work best if the background is transparent or white – AtoM will render images used as a watermark transparent, so they need not be transparent to begin with.
Document Watermark Processing Features
- Add text and image watermark to supported document formats.
- Search and remove text and image watermarks.
- Search watermarks in particular objects.
- Apply a watermark to images inside a document.
- Work with existing watermark objects.
- Extract information of watermark objects in a document.
- Perform PDF document rasterization.
- Fetch document basic information.
- Search watermarks by text formatting (font, color, etc.).
- Set background image for charts in Excel and PowerPoint documents.
- Work with PDF and email attachments.
Read & Write Watermark Formats
Digital image watermarking is a data hiding technology, mainly utilized to protect intellectual ownership rights, can be utilized in exciting mobile applications for instantaneous watermark extraction. In this paper, we report the feasibility of wave atom transform (WAT) based blind digital watermarking for watermark detection under print-cam process. We investigate the robustness of WAT domain watermarking, based on sub-blocks mean energies comparison strategy, to read a watermark embedded in a printed image using a mobile phone camera. Watermark robust to printcam process can allow instant copyright verification using a portable device and offer other interesting applications like accessing online resources, linking to personal homepage or instigating a service. We conduct experimental analysis to evaluate WAT based digital watermarking scheme’s performance to extract the embedded watermark from a printed domain image using a mobile phone camera. The experimental results show decent resistance of the scheme against print-cam process distortions
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