Microprocessor-controlled automatic focusing of a lens

Dähne, 1980, A microscope focusing technique for a digital image analysing system, Optik, 55, 437 Häusler, 1984, Simple focusing criterion, Applied Optics, 23, 2468, 10.1364/AO.23.002468 Hopkins, 1955, The frequency response of a defocused optical system, 91 Kalpagam, 1986, Microcomputer controlled automatic image focusing system Lohmann, 1983, Symmetries in coherent and partially coherent fields, Optica acta, 30, 399, 10.1080/713821222 Reddy, 1985, Microprocessor controlled photodiode array for measurement of diffraction patterns, Microprocessors and Microsystems, 9, 226, 10.1016/0141-9331(85)90269-8 Streibl, 1984, Depth transfer by an imaging system, Optica acta, 31, 1233, 10.1080/713821435 Streibl, 1985, Three-dimensional imaging by a microscope, Journal of the Optical Society of America A, 2, 121, 10.1364/JOSAA.2.000121 Thum, 1984, Measurement of the entropy of an image with application to image focusing, Optica acta, 31, 203, 10.1080/713821475