objective: to study the in vitro color changes of three dental resin veneering materials when immersed in tea, coffee and tamarind extracts. materials and methods: the color changes of heat polymerized tooth colored acrylic resin (stellondetrey, b, f14, dpi dental products of india ltd, mumbai), auto polymerized tooth colored acrylic resin (dpi, b, qv5, dpi dental products of india ltd, mumbai)...

Block-based perceptual encryption (PE) algorithms are becoming popular for multimedia data protection because of their low computational demands and format-compliancy with the JPEG standard. In conventional methods, a colored image as an input is prerequisite to enable smaller block size better security. However, in domains such medical processing, unavailability color images makes PE methods i...

<span>This paper presents the design and simulation of a hyperchaotic communication system based on four dimensions (4D) Lorenz generator. The synchronization technique that used between master/transmitter slave/receiver is dynamic feedback modulation (DFM). mismatch error master dynamics slave are calculated continuously to maintain sync process. information signal (binary image) masked ...

Data security and protection is one of the most common technologies used in field computer ‎ science. This because its great importance all fields related to daily life, whether political, economic, other aspects change. In this research paper, a new intelligent system that concentrates on image text encryption decryption proposed. Furthermore, recognition rate increased. Rivest Shamir Adleman ...

Image encryption is used to protect the images and transform into different format. In this paper, lossless encryption for color images using binary key images has been proposed. In proposed method, the key image size is same as the original image. The key image is either a bit plane or an edge map generated from another image. The method is discussed against common attacks such as the plaintex...