Web-based simulation for contrast transfer function and envelope functions

We have implemented a Web-based simulation program for the contrast transfe r function and envelope functions in Java and JavaScript. The simulation pr ovides interactive controls of all the parameters in those functions. In ad dition to the predefined functions, users can easily define new functions t hat use any of the parameters in the preset functions. The most useful feat ure of this new simulation program is the convenient, universal accessibili ty through Web browsers on any computer platform that supports Java, such a s Netscape and Internet Explorer.