Exporting R model to OpenCV's Machine Learning Library
Instead of exporting your models, consider creating an R-based interoperable environment for your modeling needs. Such environment would consists of R environment proper as well as integration layers for your third-party libraries. In particular, for the OpenCV project, consider either using r-opencv open source project (https://code.google.com/p/r-opencv), or integration via OpenCV C++ APIs and R Rcpp package (http://dirk.eddelbuettel.com/code/rcpp.html). Finally, if you want to add PMML support to the mix and create a deployable-to-cloud solution, take a look at the following excellent blog post with relevant examples: http://things-about-r.tumblr.com/post/37861967022/predictive-modeling-using-r-and-the.