English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

There is a great adventure of watermarking usage in the context ofconventional authentication since it does not require additional storage spacefor supplementary metadata. However JPEG compression, being a conventionalmethod to compress images, leads to exact authentication breaking. We discuss asemi-fragile watermarking system for digital images tolerant to JPEG/JPEG2000compression. Recently we have published a selective authentication method basedon Zernike moments. But unfortunately it has large computational complexity andnot sufficiently good detection of small image modifications. In the currentpaper it is proposed (in contrast to Zernike moments approach) the usage ofimage finite differences and 3-bit quantization as the main technique. In orderto embed a watermark (WM) into the image, some areas of the Haar wavelettransform coefficients are used. Simulation results show a good resistance ofthis method to JPEG compression with $\mbox{\rm CR}\leq 30\%$ (CompressionRatio), high probability of small image modification recognition, image qualityassessments $\mbox{\rm PSNR}\geq 40$ (Peak signal-to-noise ratio) dB and$\mbox{\rm SSIM}\geq 0.98$ (Structural Similarity Index Measure) afterembedding and lower computation complexity of WM embedding and extraction. Allthese properties qualify this approach as effective.

Semi-Fragile Image Authentication based on CFD and 3-Bit Quantization