A novel blind watermarking approach for medical image authentication using MinEigen value features

Developing new watermarking approaches that consider special features of medical images become increasingly necessary. This paper proposes a new watermarking approach to ensure medical images authenticity, using MinEigen value features, chaotic sequence, and Quantization Index Modulation (QIM) in the spatial domain. The idea is to choose the 3?×?3 non overlapping blocks around MinEigen values points, then embed the watermark bits in these blocks using a novel blind way based on chaotic sequence and QIM. The proposed technique is purely blind and fast in terms of execution time. Experimental results demonstrate that the proposed approach is robust against all DICOM JPEG compression attacks while keeping high imperceptibility.

     

Arrays of discrete atomic beams for sub-λ/2 lithography via dipole force

We present a novel experiment of generating multiple, pulsed indium atomic beams with sub-micron periodicity via rear side ablation of thin film by multiple beam interferometer using high power Q-switched Nd:YAG laser under high vacuum (∼10⁻⁵ Torr) for the first time. The applications of these atomic beams in atom lithography using dipole force as well as in direct deposition lithographic technique are discussed.     

HDG and HDGG: an extensible feature extraction descriptor for effective face and facial expressions recognition

Pattern Analysis and Applications - The potential of facial and facial expression recognitions has gained increased interest in social interactions and biometric identification. Earlier facial...