A.M. Abushaala and Y. Iano (Brazil)
JBIG Standard, Arithmetic Coding, Greyscale Coding, Lossless Compression.
The Adaptive Binary Arithmetic Coding (ABAC) is
one of the lossless data compression and decompression techniques. It is used for encoding an input data string, which is mapped into a real number x between “0” and “1”. The code string is obtained at the last division produced from the encoding process. The lossless ABAC encoder is different from other entropy encoders, Huffman for example, in the code generating process.
The Joint Bi-level Image Experts Group (JBIG)
standard adopted it. The JBIG defines a compression
method for bi-level images (images consisting of a
order of Markov model is used for each
pixel that is being encoded, while its model template of
three-line is used to compute an integer value (context).
In this work, the ABAC is implemented for a
greyscale images based on JBIG standard. The input
image is divided into bit-planes. Each of which is
divided into D resolution layers. Computer software of
ABAC and its model is used to encode the lowest
resolution layer of each bit-plane. The obtained results
presented an excellent compression in sequential mode.