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. Author manuscript; available in PMC: 2020 Oct 29.
Published in final edited form as: Cell Rep. 2020 Oct 13;33(2):108248. doi: 10.1016/j.celrep.2020.108248
Parameters:
Step 1: Detection Gaussian Mixture-Model Fitting Gaussian Standard Deviation = 1.7 pixels
Camera Bit Depth: 16
Local Maxima Detection:
Alpha-value for Comparison with Local Background = 0.05
Do Not Check “Use Rolling Window Time-Averaging”
Do Not Check “Use Absolute Background”
Gaussian Fitting at Local Maxima:
Check “Iterate to Estimate Gaussian Standard Deviation”
Maximum Number of Iterations = 10
Check “Do Iterative Gaussian Mixture-Model Fitting”
Alpha values:
Residuals = 0.05 Distance = 0.05
Amplitude = 0.05 Final = 0
Input and Output:
Frames to Use = 1–100 for Population or 1–250 for Residence
Step 2: Tracking Tracking Parameters Parameters:
Problem Dimensionality = 2
Maximum Gap to Close = 5 Frames for Population or 1 Frames for Residence
Maximum Length of Track Segments from First Step = 1 Frame
Check “Do segment merging”
Check “Do segment splitting”
Do Not Check “ Plot histogram of gap lengths after gap closing”
Check “Show calculation progress in command line”
Do Not Check “Export tracking result to matrix format”
Cost Functions:
Step 1: frame-to-frame linking:
Check “Allow direct motion position propagation”
Check “Allow instantaneous direction reversal”
Brownian Search Radius (in pixels):
Lower Bound = 1
Upper Bound = 20 for Population or 10 for Residence
Multiplication Factor for Brownian Search Radius Calculation = 3
Check “Use nearest neighbor distance to expand Brownian search radius”
Number of Frames for Nearest Neighbor Distance Calculation = 20 for Population or 10 for Residence.
Do Not Check “Plot histogram of linking distances”
Step 2: gap closing, merging and splitting:
Brownian + Directed motion models
Brownian Search Radius (in pixels):
Lower Bound = 1
Upper Bound = 20 for Population or 10 for Residence
Multiplication Factor for Brownian Search Radius Calculation = 3
Check “Use nearest neighbor distance to expand Brownian search radius”
Number of Frames for Nearest Neighbor Distance Calculation = 20 for Population and 10 for Residence
How to expand the Brownian search radius with gap length:
Scaling Power in Fast Expansion Phase = 0.5
Scaling Power in slow Expansion Phase = 0.01
Gap length to transition from Fast to Slow Expansion = 5 for Population or 1 for Residence
Penalty for Increasing Gap Length = 1.5
Check “In merging and splitting, consider ratio of intensities before and after merge/split:
Ratio of Intensity: Min Allowed = 0.5 Max Allowed = 2
Leave it Blank “Value of search Radius Lower Bound for Merging/Splitting (in pixels) ”
Check “Allow direct motion position propagation”
Check “Allow instantaneous direction reversal”
Minimum Track Segment Lifetime for Classification as Linear or Random (in frames) = 5
Multiplication Factor for Linear Search Radius Calculation = 3
How to scale the linear motion search radius with time:
Scaling Power in Fast Expansion Phase = 0.5
Scaling Power in Slow Expansion Phase = 0.01
Gap length to transition from Fast to Slow Expansion = 5 for Population or 1 for Residence
Maximum Angle Between Linear Track Segments (in degree) = 30
Kalman Filter Functions
Kalman functions = Brownian + Directed motion models
Parameters:
Do Not Check “Initial velocity estimate (in pixels/frame) ”
Do Not Check “Reference point for initial velocity estimate (in pixels) ”
Check “None of the two above”
Leave it Blank “Search Radius for first Iteration (in frames)”
Step 3: Track analysis Motion Analysis Motion analysis parameters:
Problem Dimensionality = 2
Check “Check and analyze asymmetric tracks”
Alpha value for asymmetry determination = 0.1
Alpha value for moment scaling spectrum analysis = 0.05
Method for calculation the confinement radius: “mean positional standard deviation”