Difference between revisions of "2013Shigematsu H Noisemodels"
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| − | + | Blurring due to specimen-holder drift is a common occurrence in cryo-EM images. Cameras employing active-pixel sensors are capable of high frame rates such that a single low-dose exposure can be acquired as a series of frames. In this paper we consider the possibility of tracking and compensating for overall drift in typical single-particle specimens through the analysis of frame sequences. A problem that arises in tracking through cross-correlation of frames obtained with the DE-12 camera from Direct Electron LLC is the presence of "hot-pixel noise". This random pattern of bright pixels is highly correlated among frames. We show how a model of this noise can be employed to greatly reduce its effects. A filter function is derived that optimizes the tracking of image shifts by cross-correlation, and we demonstrate the tracking of specimen drift in typical cryo-EM specimens. | |
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== Keywords == | == Keywords == | ||
| − | + | "Hot pixel noise" in Direct Detectors (DE-12) | |
== Links == | == Links == | ||
Latest revision as of 14:15, 11 September 2013
Citation
Shigematsu H, Sigworth FJ.Noise models and cryo-EM drift correction with a direct-electron camera.U ltramicroscopy. 2013 Aug;131:61-9.
Abstract
Blurring due to specimen-holder drift is a common occurrence in cryo-EM images. Cameras employing active-pixel sensors are capable of high frame rates such that a single low-dose exposure can be acquired as a series of frames. In this paper we consider the possibility of tracking and compensating for overall drift in typical single-particle specimens through the analysis of frame sequences. A problem that arises in tracking through cross-correlation of frames obtained with the DE-12 camera from Direct Electron LLC is the presence of "hot-pixel noise". This random pattern of bright pixels is highly correlated among frames. We show how a model of this noise can be employed to greatly reduce its effects. A filter function is derived that optimizes the tracking of image shifts by cross-correlation, and we demonstrate the tracking of specimen drift in typical cryo-EM specimens.
Keywords
"Hot pixel noise" in Direct Detectors (DE-12)
Links
http://www.ncbi.nlm.nih.gov/pubmed/23748163
