The automatic focusing method of a webcam is to detect the distance of the scene through an optical sensor, and then focus the lens to make the scene clear, achieving high definition of the image. Autofocus is usually divided into two methods: contrast based and phase based.
Contrast based autofocus: This focusing method uses optical sensors to detect the contrast in the image to identify the focal point, and then automatically adjusts the focal length of the lens until the image becomes the clearest. This method can achieve fast focusing, but it may be difficult for darker scenes.
Phase based automatic focusing: This focusing method utilizes optical sensors to capture images with several phase differences, calculate the distance and depth between each point in the image, and adjust the focal length of the lens based on the obtained data until the image becomes the clearest. This focusing method can effectively overcome the influence of shallow depth of field or weak light.
The automatic focusing method of the webcam can be selected based on specific application scenarios. Regardless of the method used, autofocus can improve the clarity and quality of video images, ensuring users have a better video experience.
