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We propose practical algorithms for efficient representation of images. Polynomial blending functions are used for image coding and enhancement. We use this surface model to represent image regions resulting in high perceived quality. We show that the image artifacts originated by quantization can be drastically reduced by using a representation based on blending functions. They are designed to mitigate the quantization noise generated by lossy image coding techniques like JPEG-DCT and JPEG-LS. A new recursive triangular partitioning (RTP) is proposed to represent an image by triangular...

Basic and advanced techniques are discussed aimed to modulate information into images, texts and barcodes.Conveying information over printed media can be useful for content authentication, author copyright, information and piracy product deterrent, side information for marketing, among other applications.

In the era of generative artificial intelligence and the Internet of Things (IoT) and while there is explosive growth in the volume of data and the associated need for processing, analysis, and storage, several new challenges have arisen in identifying spurious and fake information and protecting the privacy of sensitive data. This has led to an increasing demand for more robust and resilient schemes for authentication, integrity protection, encryption, non-repudiation, and privacy preservation of data. This book presents some of the state-of-the-art research in the field of cryptography and...