Compression is a technique to reduce the quantity of data without excessively reducing the quality of the data. Image compression is the application of data compression on digital images. Image compression is used to minimize the amount of memory needed to represent an image, for storage or transmission of information. When hearing that image data are reduced, one could expect that automaticall...

An x-ray imaging system, using digital subtraction techniques, has been developed. The system requires: (1) high output generation equipment; (2) an image intensifier capable of receiving high output exposures, 1 mR (2.58 X 10(-7) C/kg) at the face of the intensifier, without loss of either contrast or resolution; (3) a precision digital video camera; (4) processing computer with sufficient sto...

Digital image in raw form require a large amount of storage capacity. Due to limited bandwidth and storage capacity, images must be compressed before storing and transmitting. Image compression means reducing the size of the graphics file, without compromising on its quality. This paper entails the survey of various image compression techniques and highlights the important features of each meth...

To effectively utilize the storage capacity, digital image compression has been applied to numerous science and engineering problems. There are two fundamental image compression techniques, either lossless or lossy. The former employs probabilistic models for lossless storage on a basis of statistical redundancy occurred in digital images. However, it has limitation in the compression ratio and...

Digital medical imaging systems like Picture Archiving and Communication System (PACS) has become a crucial tool supporting both decision making and treatment procedures in medical environments. Advantages come from reduced storage and management costs associated with image data and increased intra and interinstitutional portability of data in communication networks. One of the most important b...

An information security method that uses a digital holographic technique is presented. An encrypted image is stored as a digital hologram. The decryption key is also stored as a digital hologram. The encrypted image can be electrically decrypted by use of the digital hologram of the key. This security technique provides secure storage and data transmission. Experimental results are presented to...

background: breast cancer is one of the most important diseases in females. malaysian women have not excluded. according to the malaysian oncology society [1], about 4% of women (who are 40 years old and above) have involved by breast cancer. masses and microcalcifications are two important signs for breast cancer diagnosis on mammography. according to our estimation, radiologists could diagnos...

With the growth of technology and the entrance into the Digital Age, the world has found itself amid a vast amount of information. Dealing with such enormous amount of information can often present difficulties. Digital information must be stored and retrieved in an efficient manner, in order for it to be put to practical use. Compression is one way to deal with this problem. Images require sub...