title: EMAN2: an extensible image processing suite for electron microscopy.
abstract: EMAN is a scientific image processing package with a particular focus on single particle reconstruction from transmission electron microscopy (TEM) images. It was first released in 1999, and new versions have been released typically 2-3 times each year since that time. EMAN2 has been under development for the last two years, with a completely refactored image processing library, and a wide range of features to make it much more flexible and extensible than EMAN1. The user-level programs are better documented, more straightforward to use, and written in the Python scripting language, so advanced users can modify the programs' behavior without any recompilation. A completely rewritten 3D transformation class simplifies translation between Euler angle standards and symmetry conventions. The core C++ library has over 500 functions for image processing and associated tasks, and it is modular with introspection capabilities, so programmers can add new algorithms with minimal effort and programs can incorporate new capabilities automatically. Finally, a flexible new parallelism system has been designed to address the shortcomings in the rigid system in EMAN1.
authors.affiliation: National Center for Macromolecular Imaging, Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
authors.forename: Guang
authors.initials: G
authors.lastname: Tang
authors.forename: Liwei
authors.initials: L
authors.lastname: Peng
authors.forename: Philip R
authors.initials: PR
authors.lastname: Baldwin
authors.forename: Deepinder S
authors.initials: DS
authors.lastname: Mann
authors.forename: Wen
authors.initials: W
authors.lastname: Jiang
authors.forename: Ian
authors.initials: I
authors.lastname: Rees
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Ludtke
mesh_terms: D000465:Algorithms; D019295:Computational Biology; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008854:Microscopy, Electron / Q000379:methods*; D012984:Software; D012985:Software Design; D040681:Structural Homology, Protein