Abstract: A Joint Bi-level Image Group (JBIG) coding and decoding system, which provides a series of fully serial and parallel computational combinations in arithmetic coding and decoding to thereby reduce the complexity of JBIG arithmetic encoder and decoder and increase the processing speed. The JBIG coding system receives pixels and contexts of an image datastream and performs an adaptive arithmetic coding on the pixels in accordance with a pre-stored table and a probability prediction table for further performing a non-distortion compression on the image datastream. The JBIG decoding system receives data and contexts of a compressed datastream and performs an adaptive arithmetic decoding on the data of the compressed datastream in accordance with the pre-stored table and the probability prediction table to thereby obtain an image datastream.

Abstract: A Joint Bi-level Image Group (JBIG) coding and decoding system, which provides a series of fully serial and parallel computational combinations in arithmetic coding and decoding to thereby reduce the complexity of JBIG arithmetic encoder and decoder and increase the processing speed. The JBIG coding system receives pixels and contexts of an image datastream and performs an adaptive arithmetic coding on the pixels in accordance with a pre-stored table and a probability prediction table for further performing a non-distortion compression on the image datastream. The JBIG decoding system receives data and contexts of a compressed datastream and performs an adaptive arithmetic decoding on the data of the compressed datastream in accordance with the pre-stored table and the probability prediction table to thereby obtain an image datastream.

Abstract: The present invention is to provide a text enhancement methodology of gray-scale levels of a scanned image so as to enhance text legibility. The text enhancement methodology includes the following steps of: utilizing a window block pattern as a fumdamental processing unit to read the scanned image, wherein the window block pattern comprises at least two pixels in a predetermined neighborhood; analyzing the scanned image in the window block pattern to find right, left, upper, and bottom edges; labeling the image in the window block pattern as two groups of text pixels and non-text pixels based on the window block pattern and the right, left, upper, and bottom edges; and enhancing the text pixels/non-text pixels of scanned image in the window block pattern based on the window block pattern and the right, left, upper, and bottom edges.