What is an autofocus video microscope？

Auto Focus Video Microscope is a precision optical equipment integrating real-time video imaging and auto focus function. It captures the details of the samples through the optical lens, which is converted into electronic signals by the image sensor, and displays the high-definition video image on the display in real time; at the same time, the built-in autofocus system of the equipment can detect the clarity of the image in real time through the algorithm, and adjust the focal length of the lens or the position of the carrier stage automatically to ensure that the image is always clear, without the need for manual focusing by hand.

How Autofocus works:

The realization of the autofocus function relies on the synergy of “Image Analysis + Mechanical Drive”, which is divided into two main technology routes:

1. Passive autofocus mode: The sample screen is captured by the image sensor and a built-in algorithm analyzes the sharpness of the screen. When blurring of the picture is detected, the algorithm calculates the “focusing error” and drives the motor to adjust the focal length of the lens or the height of the carrier table until the contrast reaches its peak. Suitable for high contrast samples (e.g. electronic components, printed circuits, cell slices), no additional light source interference, purer imaging.

2. Active autofocus mode: the device actively emits infrared light, laser or ultrasonic waves, and calculates the distance between the sample and the lens by detecting the “time difference” or “phase difference” of the reflected signal, and directly drives the focusing mechanism to adjust the position. It is suitable for low-contrast samples (e.g. transparent films, smooth metal surfaces), samples with strong reflections or blurred textures, and avoids relying on the contrast of the picture itself.

POMEAS autofocus video microscopes, on the other hand, belong to the passive autofocus mode, capable of focusing in real time, automatically adjusting the light source, and paired with software that allows for easy dimensional measurements.