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This paper describes research in the use of Java and J2ME to develop cross platform computer vision applications for mobile phones with integrated cameras. The particular area of research that we are interested in is mobile augmented reality (AR). Currently there are no existing computer vision libraries which can be used for augmented reality on the J2ME platform. This paper introduces the structure of our J2ME computer vision library and describes the implementation of algorithms in our library. We also present several sample AR applications on J2ME enabled mobile phones and report on experiments conducted to evaluate the compatibility, portability and efficiency of our library.