Focusing Algorithm of Automatic Control Microscope Based on Digital Image Processing

Table 2

Comparison of time performance of various focusing functions.

Focus function		Fourier	Brenner	Gray variance	Laplace	Improved Laplace
Real-time frame; (ms/frame)	Edge obvious goal	150.1	73.6	77.1	76.9	77.6
	Edge unobvious target	146.3	73.2	76.9	76.7	77.2