Defines Lossless Compression Encoding

"PROGRESSIVE " capability:

Progressive encoding has two distinct benefits:

II-The other benefit of progressive encodings is that they can provide subjectively superior image browsing (on a CRT) for an application using low-rate and medium-rate communication links. A low-resolution rendition is transmitted and displayed rapidly, and then followed by as much resolution enhancement as desired. Each stage of resolution enhancement builds on the image already available. Progressive encoding can make it easier for a user to quickly recognize the image as it is being built up, which in turn allows the user to interrupt the transmission of the image (Internet applications).

JBIG, Power of Compression:

• The main purpose behind JBIG is to replace the less efficient compression algorithms used by CCITT Group3 & Group4.
• For scanned images of printed text or line art the compression ratio of JBIG is (10 –50) % greater than that of Group4.
• 500% greater than Group4 for computer generated images of printed text.
• 2 to 30 times better for images with grayscale rendered by half-toning or dithering.
• JBIG is sensitive to noise, the compression ratio decreases when the amount of noise in your image increases.
• JBIG can be used as an alternative to lossless JPEG. JBIG produces better results than lossless JPEG on images with two to five bits per pixel and produce identical results on image with data six to eight pixels.
• Cost Savings from 20-60% Smaller Files : Cost savings come from several areas.
• JBIG's smaller files lead to fewer optical disks for storage, less network bandwidth, and faster transfer of files.

Where can JBIG be used?

• Document imaging: electronic scanning, storage, and management of paper-based documents.
• Banking applications.
• Internet applications or even any network related applications.
• Storing A0 sized engineering documents. Multiple resolution layers can be stored so that the user can browse through using a low resolution preview and then display the image at the desired resolution.

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