Thesis

Recommender systems have been introduced to provide a solution to navigating the huge volume of information already available and growing at an explosive rate. The amount of information available in electronic form, such as news, movies, books, advertisements and other online information is overwhelming us. Recommender systems are computerbased techniques that can be utilized to efficiently

       The recent study deal with the structural and optical properties of Al 2O3 thin films prepared by the chemical spray pyrolysis technique at glass substrate(450°C) and studying the effect of annealing at different temperatures (500,550,600) °C on the optical properties.The results of X-ray diffraction showed that the prepared films are polycrystalline, the study of optical properties included the record of transmittance spectrum of the films with the wavelengths range from (300-900)nm, and then measuring the forbidden energy gap of electronic transitions w

   The study of the effect of some factors on the human is difficult and complex because of the lack of instruments for measuring eye efficiency. The human eye is an optical organ, its work is similar to the camera work, but the eye can not return the image which it makes, but the camera can return. Producing high quality image by human optical system like other lens system is affected by many parameters, some of them are internal such as aberrations and age, pigmentation.

The spying and intrusion operation had been widely spread to steal the information especially with the development of computer networks (like,Internet). To prevent this danger the development of a new technology called “digital information hiding” was developed in such a way that the intruder cannot notice the existence of secret information in the media.In this project an image steganograph system is introduced. The proposed system is based on using the affine transform to represent the blocks of the secret image in terms of the blocks of the cover image.