Converting a MATLAB image processing program to Java can be a complex process, as the two languages have different syntax, data types, and libraries. Here are some general steps you can follow:

1. Identify the MATLAB functions used in your image processing program and determine their Java equivalents. You can refer to the Java documentation or online resources for this purpose.

2. Identify any MATLAB-specific data types used in the program, such as matrices, and find the corresponding Java data types. For example, MATLAB matrices can be represented as 2D arrays in Java.

3. Rewrite the program using Java syntax and data types, making use of the appropriate Java libraries for image processing.

4. Test the program thoroughly to ensure that it produces the same results as the original MATLAB program.

5. Optimize the Java code as needed for performance, taking advantage of any Java-specific features that may improve the speed or efficiency of the program.

Keep in mind that this process can be complex, and may require a significant amount of time and effort depending on the complexity of your MATLAB program. It may also be helpful to consult with experts in both MATLAB and Java to ensure that your program is properly translated and optimized.