efficiency. It is therefore important to compress the image by storing the information needed to reconstruct the image. To compress any image, redundancy must be removed. Sometimes images that have large areas of the same color will have the advantages and disadvantages of compress [1-3]. The main purpose of this paper is to reduce irrelevance and redundancy of JPEG and PNG image data in order to store or transmit data in an efficient form using DCT and DWT. different image compression formats and performance
CHAPTER 1 INTRODUCTION TO FACE RECOGNITION 1.1. BIOMETRICS A biometric system is a technological system that uses information about a person to identify that person. Biometric systems rely on specific data about unique biological traits in order to work effectively. A biometric system will involve running data through algorithms for a particular result, usually related to a positive identification of a user or other individual. We all have unique physiological
CHAPTER 1 INTRODUCTION 1.1 Cryptography The word cryptography is derived from the Greek words Cryptos meaning cover and grafia meaning writing [1] defining it as covered writing. In image cryptography the information is hidden exclusively in images. Cryptography is the art and science of secret communication .It is the practice of encoding/embedding secret information in a manner such that the existence of the information is invisible. The original files can be referred to as cover text, cover image