The Qx-coder

The IBM Adaptive Bilevel Image Compression (ABIC) algorithm depends upon th e hardware-optimized Q-coder. The Joint Bi-level Image Experts Group (JBIG) settled upon a software-optimized QM-coder. This paper explores the incomp atibilities of the hardware- and software-optimized binary arithmetic codin g conventions and reports on the solution that allowed a merged Qx-coder in hardware. A unique hardware solution is presented for the termination of t he JBIG data stream (CLEARBITS). The probability estimation is presented in a common format. Detailed flowcharts are included in the Appendix. An ASIC core is available that supports both the ABIC and JBIG bilevel data compre ssion standards using this merged Qx-coder.