title: Accurate particle position measurement from images.
abstract: The moment method is an image analysis technique for subpixel estimation of particle positions. The total error in the calculated particle position includes effects of pixel locking and random noise in each pixel. Pixel locking, also known as peak locking, is an artifact where calculated particle positions are concentrated at certain locations relative to pixel edges. We report simulations to gain an understanding of the sources of error and their dependence on parameters the experimenter can control. We suggest an algorithm, and we find optimal parameters an experimenter can use to minimize total error and pixel locking. For a dusty plasma experiment, we find that a subpixel accuracy of 0.017 pixel or better can be attained. These results are also useful for improving particle position measurement and particle tracking velocimetry using video microscopy in fields including colloids, biology, and fluid mechanics.
authors.affiliation: Department of Physics and Astronomy, The University of Iowa, Iowa City, IA 52242, USA. yan-feng@uiowa.edu
authors.forename: Y
authors.initials: Y
authors.lastname: Feng
authors.forename: J
authors.initials: J
authors.lastname: Goree
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D004391:Dust / Q000032:analysis*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D018715:Microscopy, Video / Q000295:instrumentation / Q000379:methods*; D049329:Nanostructures / Q000648:ultrastructure*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013382:Subtraction Technique
chemical_list: D004391:Dust