Proceedings ArticleDOI
Digital signature of color images using amplitude modulation
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TLDR
A new method based on amplitude modulation is presented that has shown to be resistant to both classical attacks, such as filtering, and geometrical attacks and can be extracted without the original image.Abstract:
Watermarking techniques, also referred to as digital signature, sign images by introducing changes that are imperceptible to the human eye but easily recoverable by a computer program. Generally, the signature is a number which identifies the owner of the image. The locations in the image where the signature is embedded are determined by a secret key. Doing so prevents possible pirates from easily removing the signature. Furthermore, it should be possible to retrieve the signature from an altered image. Possible alternations of signed images include blurring, compression and geometrical transformations such as rotation and translation. These alterations are referred to as attacks. A new method based on amplitude modulation is presented. Single signature bits are multiply embedded by modifying pixel values in the blue channel. These modifications are either additive or subtractive, depending on the value of the bit, and proportional to the luminance. This new method has shown to be resistant to both classical attacks, such as filtering, and geometrical attacks. Moreover, the signature can be extracted without the original image.read more
Citations
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Proceedings ArticleDOI
Blind image-adaptive watermarking
TL;DR: An improved detection scheme has been developed, which is blind, in the sense that no knowledge concerning the cover image is required, and the proposed technique exhibits superior performance as compared to the conventional HVS-based blind adaptive watermarking.
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Alpha Channel for Integrity Verification Using Digital Signature on Reversible Watermarking QR
TL;DR: In this paper, a matrix barcode with the three level image watermarking using QR code and digital signature to verify image copyrights is proposed and the alpha channel is used for controlling the transparency of the image.
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A Robust Watermarking Scheme Based on the Mean Modulation of DWT Coefficients
TL;DR: Experimental results prove that the proposed approach successfully satisfies the watermarking requirement and outperforms existing methods against both geometric and signal processing attacks.
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Semiblind copyright protection of color images based on a hybrid classified watermarking technique
TL;DR: A novel approach for robust and semiblind watermarking of still color images in the wavelet domain is proposed that exhibits very high imperceptibility and is sufficiently robust to guard against JPEG compression, additive noise, filtering, moderate cropping, scaling, and other common image manipulations.
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Digital image of watermarking: a survey
TL;DR: In this review paper, certain requirements and apps intended for watermarking are usually reviewed and purposes consist of copyright defense, data monitoring, and data pursuing.
References
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Journal ArticleDOI
Secure spread spectrum watermarking for multimedia
TL;DR: It is argued that insertion of a watermark under this regime makes the watermark robust to signal processing operations and common geometric transformations provided that the original image is available and that it can be successfully registered against the transformed watermarked image.
Proceedings ArticleDOI
A digital watermark
TL;DR: The paper discusses the feasibility of coding an "undetectable" digital water mark on a standard 512/spl times/512 intensity image with an 8 bit gray scale, capable of carrying such information as authentication or authorisation codes, or a legend essential for image interpretation.
Proceedings ArticleDOI
Techniques for data hiding
TL;DR: This work explores both traditional and novel techniques for addressing the data hiding process and evaluates these techniques in light of three applications: copyright protecting, tamper-proofing, and augmentation data embedding.