Huang Youlong, the driver of Zhao Wei's husband, pretended to be Huang Youlong and went to the notary office. He applied for a certificate of entrustment through face recognition technology and entrusted others to sell the house to others. Not long ago, this news aroused people's attention to the hot word "face recognition".
Will face become the only key for us to open doors, swipe cards, withdraw money and even handle all kinds of important affairs in the future? Can make-up and face changing fool the face recognition system?
A few days ago, the reporter of Huashang Daily invited the face recognition system equipment of Beijing Hanwang Zhiyuan Technology Co., Ltd. and the professional makeup teacher of Anren Baoe Makeup Manicure Training Center to interpret the secret of "face recognition" through experiments.
& gt& gt experimental principle
According to reports, face recognition requires three steps:
Step 1, the computer locates the real face photos stored in the warehouse, judges whether there is a face and determines its position; Step 2, performing a series of data processing on the face image to locate the key points of the face and obtain key point data; Thirdly, after extracting statistical features according to the key points of the face, the extracted features are compared with the face feature data extracted by the same method in the personnel information base to complete the whole recognition process.
The premise is that the face is completely exposed in front of the camera during recognition, and there can be no facial occlusion.
& gt& gt experimental steps
The face recognition system used in the experiment is equipped with an analog entrance guard switch. The system inputs the face information of the "owner" first, and then scans the face of the person standing in front of the entrance guard switch again. After confirming that it is the "owner", the "door" will automatically open the access control immediately, and the recognition time is less than one second.
experiment
What kind of makeup can you "tolerate"? Don't exaggerate.
Four young girls took photos and entered information in front of the "face recognition" access control system in advance, becoming simulated "homeowners", and then professional makeup teachers gave them evening dresses, ancient costumes, old people's makeup and makeup, and then identified them separately to see if the system could still identify them.
1. Evening makeup: There is no obvious change in the facial features of the "master" in the fashion evening makeup style. When standing in front of the system, access control will open immediately.
2. Ancient costume: Although the "owner" dressed in Tang costume wears the makeup of ancient women and wears ancient headdresses and costumes, the system recognized her without hesitation and successfully opened the door.
3. Make-up for the elderly: Through make-up, the young "homeowner" becomes an old lady with wrinkled face, loose skin and drooping eyelids, and once again stands in front of the access control system. The system didn't recognize her and refused to open the door.
4. Make-up: The "owner" with makeup has a little smoke in his eyes, painted green eye shadow and painted flowers around his eyes. This time, the system still didn't recognize the owner of the makeup.
Analysis:
The R&D engineer of Beijing Hanwang Zhiyuan Technology Co., Ltd. explained that the exaggerated makeup and modeling around the eyes greatly changed the statistical feature points adopted by the recognition system, which made it impossible for the system to recognize the person. However, after pretending to be an old man, the eyebrows, nose bridge and cheekbones were changed by using makeup techniques such as silhouette and shadow, and the facial features also changed greatly, which led to the poor matching degree between the face recognition system and the original template features when recognizing the same person again, so it was judged as "not the owner".
experiment
Does it matter whether you wear glasses or not? have
1. After the simulated "homeowner" put on his glasses and entered facial information, when he took off his glasses and stood in front of the entrance guard again, the system no longer knew the "homeowner".
2. Simulate the "homeowner" not wearing glasses to input facial information, and then standing in front of the entrance guard with half-frame glasses. The system doesn't know this "owner" either.
3. When the "homeowner" inputs facial information, he first puts on his glasses and then takes them off. The system records his two states at the same time, and then recognizes him whether he wears glasses or not.
Analysis:
Glasses will block the feature points around the face, especially the eyes, which occupy a large weight in the recognition process, resulting in the system unable to recognize.
experiment
Does sticking a transparent band-aid affect recognition? do not affect
The "owner" was attached to the left eye and the outside of the chin with transparent band-AIDS, and the system recognized it at the first time. So, if your face is injured, don't worry that the brush machine won't recognize you when you go to brush your face for attendance.
Analysis:
Transparent band-aid has little effect on the five senses.
experiment
Can twins fool face recognition? unsuccessful
The reporter from Huashang Daily also found a pair of identical twin sisters aged 17 and a pair of fraternal twin sisters aged 4 to carry out the experiment.
1. 17-year-old identical twin sisters, they look very similar, it is difficult for outsiders to tell them at a glance, but after the elder sister entered the information, the younger sister failed to "pretend" to open the door.
There are obvious differences in eye characteristics between 2.4-year-old fraternal twins. Sister failed to open the door after her sister entered the information.
Analysis:
The subtle differences that are difficult to identify with the naked eye can still be identified by the system through data calculation. However, R&D engineer of Beijing Hanwang Zhiyuan Technology Co., Ltd. also added that because of the particularity of twins, especially twins who look very similar, it is very difficult to distinguish from facial features, and face recognition still has a certain chance of failure. At present, it is not possible to distinguish twins only by facial features.
analyse
Cosmetic surgery to change the five senses will affect the recognition.
Simply put, the face recognition system mainly extracts the key points of the contours of the main organs such as eyes, eyebrows, mouth, nose and cheeks according to the face, and extracts the statistical features near the key points. The system needs to extract more than 3000 statistical features for each face, and the most subtle expression change is around the eyes. Even if this person's expression is stiff, there will still be very subtle changes in characteristics around his eyes.
The changes of general life makeup, heavy makeup, hair and eyebrow shapes and colors have little influence on the recognition performance of the system, because these changes have not caused the occlusion of key facial organs or changed the statistical characteristics near key points on a large scale.
However, if the features near the key points of the face are changed on a large scale, such as adding a thick beard around the lips or adding bangs on the forehead or even covering the eyebrows, the original features will be obviously affected and even cannot be recognized correctly.
If you have done rhinoplasty, bone cutting, forehead plastic surgery and other plastic surgery that will obviously change your face shape, it will also affect face recognition.
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