Cell Motil Cytoskeleton 1990 Jan 01;174:309-16. doi: 10.1002/cm.970170406.

Computerized analysis of flagellar motility by digitization and fitting of film images with straight segments of equal length.

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Methods are described for computerized analysis of digitized images obtained by scanning photomicrographs of swimming sperm flagella. After storing a series of image frames in computer memory, the entire series is analyzed automatically. For each sperm image, the sperm head is located to obtain a starting point for analysis of the flagellum. This location is obtained by minimizing image intensity along a model of the sperm head outline. The flagellum is modelled by a series of straight segments of equal length: 0.5 or 1 micron. The angles between these segments are adjusted to give minimum image intensity along the line of the model as well as minimizing smoothing functions. Extensions to analyze a series of images in each frame, and to measure the positions of beads attached to the flagellar microtubules, are also described.

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