There was an implementation in imglib that was never ported to imglib2. See: - [HoughTransform](https://github.com/fiji/legacy-imglib1/blob/master/src/main/java/mpicbg/imglib/algorithm/transformation/HoughTransform.java) - [HoughLineTransform](https://github.com/fiji/legacy-imglib1/blob/master/src/main/java/mpicbg/imglib/algorithm/transformation/HoughLineTransform.java)
