face recognition manufacturer < / a > talking about face detection technology and algorithm

"Face detection" is a technology to detect the location of the face in the image

The input of face detection algorithm is a picture, and the output is the coordinate sequence of face frame (0 person face frame or 1 person face frame or multiple person face frames). Generally, the output face coordinate frame is an upward square, but some face detection technologies output an upward rectangle or a rectangle with rotation direction

Common face detection algorithms are basically a process of "scanning" and "discrimination", that is, the algorithm scans within the image range, and then determines whether the candidate area is a face one by one. Therefore, the computing speed of face detection algorithm will be related to image size and image content. During the development process, the algorithm can be accelerated by setting "input image size", or "to small face size limit", or "upper limit of face number"