What is the principle of digital camera autofocus?
From the basic principle, autofocus can be divided into two categories:
Phase method The method is achieved by detecting the offset of the image to achieve auto focus.
Contrast method This method is achieved by detecting the contour edge of the image to achieve autofocus
1, ranging autofocus: ranging autofocus mainly infrared ranging method and ultrasonic ranging method.
one is based on the distance between the lens and the subject being measured distance measurement autofocus, and the other is based on the focus on the screen clear focus detection auto focus.
