Various compression methods have been proposed to achieve high compression ratios and high image qualities in low computation time. One of these methods is Fractal Image Compression. The basic idea of fractal image compression is the partitioning of input image into non-overlapping range blocks. For every range block a similar but larger domain block is found. The set of coefficients of mapping the domain blocks to the range block, using affain transform, is recorded as compression data. The compressed image data set is called the Iterated Function System (IFS) mapping set. Decoding process...

Database systems have been extremely important part in daily life, because it is processing daily huge amounts of data, it has been depended for wide field's such as bank system, personal system, medical system, communication system, ...etc. Sensitive data is stored in database, in other words, data that an attacker looking for, is stored in database, so concerning of protecting these data have been a critical issue, this concern is the central theme of database security. Database security is ensures the secrecy, integrity, and availability of stored data. There are many techniques and...

This research work aims to investigate the required image processes to extract the features of the red blood cells, and to utilize these features to recognize the normal blood cells from some considered types of anemia infected blood cells. Two sets of features (i.e., geometrical and textural) were suggested, and their discrimination capabilities have been tested. The suggested blood cell recognition scheme consists of three stages. The first stage implies all image processing steps required to determine the background/target colors and to isolate the cell area (target) from the...

This book is aimed to develop a steganography system that hides secret data in audio data by using Fourier transform domain. There are two embedding methods one depends on voiced block while the second depends on audio blocks that successfully passed the integrity retrieved bits tests. two methods are done on the phase component of the cover audio signal that produced after applying Fourier Transform. During the embedding stage, the symmetry attribute of the Fourier domain should be taken into consideration.