The Recognition Primitives Library version 3.1, release in November, 1997, is now available for you to download. It is primarily a bug fix release and also provides substantial performance enhancements on Pentium^® Pro and Pentium II processors.

The Recognition Primitives Library version 3.1 includes discrete, continuous, and semi-continuous HMM functions. Also included is an example of how to derive your own, smaller, custom DLL and Lib files from the recognition library DLL and Lib files. Future versions of the Recognition Primitives Library will be backwards-compatible for this calling interface.

This release uses MMX^™ technology to accelerate the integer functions within the library. Both a static library and a processor-specific DLL are provided which take advantage of MMX technology. The release notes for this release of the Recognition Primitives Library which contain more information, are installed during the library installation.

The Library includes an application compatible with Windows* NT* and Windows 95 that will measure the performance of the library functions on any Intel Architecture-based PC. Source code for the test program and a .mak file are provided to allow you to modify the way the performance is tested, and to make it more relevant to your application. A demonstration program that uses the image processing functions in the library is also included along with the source code and a .mak file.

The Pentium^® II Processor Supplement
A new DLL containing functions optimized specifically for the Pentium^® II processor is now available for you to download. See "Download and Install" for instructions.

Release History
Version 1.0 was the first public release of the Recognition Primitives Library. It was originally released to alpha sites in mid-March of 1995 and given general distribution on the IAL June 1995 CD ROM. It consisted of a Pentium^® processor-optimized static library form of the functions.

Version 2.0, released in September 1995 added processor-specific, dynamically linked libraries (DLLs). A DLL detects the processor type at the time the DLL is loaded and loads a processor-specific DLL which is optimized for either the Intel486^™, Pentium processor, or the Pentium Pro Processor.

Version 3.0, released in March, 1997, provided the foundation for the the 3.1 release.