Some cameras have the function of locking people's faces when taking pictures. What is this?

What does the facial recognition function of digital camera mean? What's the use?

Facial recognition is a new selling point of the camera, also known as smiling face recognition.

Give priority to the face when taking pictures, which is helpful for non-professionals to take pictures!

However, in practice, the face is too big or too small, or the light is particularly insufficient, so face recognition will not work!

So facial recognition is useful, but not as powerful as advertised.

face recognition technology

The principle of face detection and facial recognition technology doesn't sound profound. It locks the position of the face in the picture by identifying the eye, mouth and other characteristic information in the picture, automatically takes the face as the shooting object, and sets the accurate focal length and exposure. When the face detection and face recognition function starts to work, the camera will automatically set according to the position and illumination of the face in the picture to ensure the clear and accurate exposure of the face. In addition, when there are many people in the picture, the face detection and facial recognition function can also accurately select the most important object.

How to realize face recognition technology

In previous shooting, how to deal with the relationship between people and background has always been a troublesome problem: if the people are not in the middle of the viewfinder, the camera may focus on the distant background, resulting in blurred people; When the brightness difference between the person and the background is large, it will lead to underexposure or overexposure of the face. In order to solve these problems, professional digital cameras are equipped with "5 o'clock and 9 o'clock" focusing systems and "surface metering, spot metering and surrounding metering" metering systems, plus "AE/AF lock". Such a complicated setting is a great test for the photographer's experience and finger flexibility, but for many digital cameras that don't have these functions, the photographer is completely helpless. The emergence of face recognition technology and face detection technology makes this problem no longer exist. This technology allows the camera to automatically identify whether there is a face in the picture and automatically take the face as the subject. Then the focus and exposure control of the camera will be adjusted according to the situation of the face.

This function brings two benefits: first, it allows photographers to focus more on framing and achieve a more perfect composition; The second is to improve the shooting speed.