A posteriori correction of camera characteristics from large image data sets

作者：Afanasyev Pavel; Ravelli Raimond B G; Matadeen Rishi; De Carlo Sacha; van Duinen Gijs; Alewijnse Bart; Peters Peter J; Abrahams Jan Pieter; Portugal Rodrigo V; Schatz Michael; van Heel Marin^*

来源：Scientific Reports, 2015, 5(1): 10317.

DOI：10.1038/srep10317

Large datasets are emerging in many fields of image processing including: electron microscopy, light microscopy, medical X-ray imaging, astronomy, etc. Novel computer-controlled instrumentation facilitates the collection of very large datasets containing thousands of individual digital images. In single-particle cryogenic electron microscopy ("cryo-EM"), for example, large datasets are required for achieving quasi-atomic resolution structures of biological complexes. Based on the collected data alone, large datasets allow us to precisely determine the statistical properties of the imaging sensor on a pixel-by-pixel basis, independent of any "a priori" normalization routinely applied to the raw image data during collection ("flat field correction"). Our straightforward "a posteriori" correction yields clean linear images as can be verified by Fourier Ring Correlation (FRC), illustrating the statistical independence of the corrected images over all spatial frequencies. The image sensor characteristics can also be measured continuously and used for correcting upcoming images.

• 出版日期2015-6-11