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3.24. How does software autofocus work?

Volocity finds the point in the autofocus range where the signal to noise ratio is maximized (i.e. brightest point in image / darkest point in image is greatest). We use a golden section method to find this position:

http://en.wikipedia.org/wiki/Golden_section_search

The golden section search seeks to minimize the number of sample exposures Volocity has to achieve.

The autofocus can be thrown by local maxima in the image, this is why it is important to set the autofocus limits correctly.

If a region of interest is drawn on the live preview the autofocus algorithm will be restricted to this region.