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Does face attendance choose face comparison 1:1 or face search 1:N?

2022-08-10 12:17:00 【InfoQ】

Does face attendance choose face comparison 1:1 or face search 1:N?The first time you come into contact with face recognition products or technologies, you will be a little confused. These two seem to be the same thing, but they are not the same algorithm, and the implementation process is also different. How to choose the best one?The classification introduces which face attendance scenarios are suitable for face comparison 1:1 and face search 1:N.
1, face search 1:N
First of all, face search requires the establishment of a face database. When face attendance is performed, the face picture obtained by punching in the scene andPerform face liveness detection to prevent non-live check-in.After completing the above steps, the face image and the image in the face database are retrieved, and the similarity returned by the retrieval result is greater than the set face threshold, then it can be determined that the puncher is in the face database.
Where is the punch-in mechanism above used?This scene is mostly on the local punching device, such as the company's face punching machine, face gate and other equipment.Typical cases include Dingding smart front desk face recognition attendance machine and Foxconn face gate.Fixed punch-in equipment, fixed punch-in crowd, and fixed network environment. Based on this situation, it is more reasonable to use face search.
 


2. Face comparison 1:1
Face comparison is the comparison of two face pictures, this ability can also be applied to face attendance, and this ability hasHigher mobility, unlimited network, unlimited device.
In recent years, due to the epidemic, working from home has become commonplace. If attendance is achieved at home, and it is face attendance, the company has an AO system that can complete face attendance based on its own system + face searchAnother situation is to use third-party face attendance software for punching in.
DingTalk's face attendance is used as an example for illustration, but it does not mean that DingTalk must complete the face attendance process according to the following process.Attendance through DingTalk, using positioning + face attendance, when face attendance, employees log in to their own DingTalk, enter the face attendance check-in function, take pictures on the spot, and the pictures after taking pictures will be subjected to face liveness detection.The detected face image will be compared with a face image cached under the employee's DingTalk account. If the comparison result exceeds the set face threshold, it will be determined to be the same person, plus punching and positioning to achieve face attendance..



SoTo sum up, both face search and face comparison can be applied to face attendance, but you need to consider your own attendance process and attendance equipment to determine which method is the most suitable.
 
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