"Finding trafficked children, this is a chore!" Lu Weiwei gasped, her voice loud...... The whole cafeteria could be heard.

Gao Xu scratched his head embarrassedly......

Looking at the strange stares of the surrounding crowd, it was still a little embarrassing.

He is not a person who is good at expression, and his partner Liao Kai is the same, so the two will not look stuffy when they work together.

And it was a case in a different place, so the two spoke very quietly.

However, as a policewoman, Lu Weiwei's voice is much louder than the two of them.

From the beginning of the conversation, Gao Xu and Liao Kai felt the "enthusiasm" of the Jiangnan City police. ”

"Hehe, yes, this time we have seven working groups, a total of more than 20 people, sent to different cities to find the whereabouts of those trafficked children. ”

Gao Xu took a sip of the drink Gu Chen bought and continued: "Our group came to Jiangnan City specifically to find a little girl who was abducted and trafficked ten years ago. ”

"Ten years ago?" Gu Chen was also stunned for a moment, feeling that things were not so simple.

Officer Wang also said: "Isn't it even more difficult to find a case that was not solved ten years ago, and now it is even more difficult to find it ten years later?"

"No matter how hard it is, you have to find it. Liao Kai, who rarely spoke, finally confided: "We also know that this kind of task is very arduous, but we are bringing the latest technology, and it can be regarded as an experiment here, or an attempt." ”

Gu Chen looked at Officer Wang and Lu Weiwei beside him unconsciously.

The three of them stared at each other, feeling that this was a bit interesting.

Ten years ago, two police officers from other places were able to find trafficked children with the latest technology?

If there is no definite goal, it can be said that this search is no different from looking for a needle in a haystack.

Gu Chen had also been in contact with some cases of lost children before, but they were all found on the day they were lost.

This is not a difficult thing to do for having a well-developed monitoring network nowadays.

But the child who was lost ten years ago is now looking for it, not to mention the vast sea of people, even to give you an approximate range, which will also require a lot of work.

Lu Weiwei was a little impatient and asked, "What kind of cutting-edge technology are you brought?

Gao Xu and Liao Kai looked at each other, and after just thinking for a few seconds, Gao Xu blurted out: "We cooperated with a high-tech company in Pengcheng to develop a cross-age face recognition algorithm. ”

"Cross-age...... Face recognition algorithm?" Lu Weiwei was stunned for a moment, and then she relieved herself and said, "What is this?"

"To put it simply, it should be to use this face recognition technology to solve the face recognition problem of the same person at different ages, and to infer the appearance of young children when they grow up through data analysis, right? Officer Gao, Officer Liao. ”

Gu Chen quickly guessed the cutting-edge technology that the other party said based on his previous knowledge of the face recognition skills given by the system.

Gao Xu and Liao Kai's eyes were obviously stunned for a moment, and both of them looked at Gu Chen incredulously.

Gao Xu was surprised and said, "Gu Chen, this technology is still in the testing stage, how would you know?"

"That's right, this time the bureau sent our seven working groups to different cities to verify the operability of this technology, it stands to reason that no other brother unit should know, right?" Liao Kai also expressed his doubts.

Gu Chen was only suspicious before, but now that he got the results from Gao Xu and Liao Kai, he suddenly felt a sense of relief.

The technical theory that I had mastered before was still useful, at least this technology, and I currently have it.

But how to control it, there is no direct application.

"I'm just in the relevant academic forums, I came across some of them, and I often discuss some of them, and I remember some of the relevant content about face recognition. ”

Gu Chen casually found a reason to go over.

Gao Xu said with a smile: "It seems that your police in Jiangnan City still have very high professional requirements, like we only know how to work hard, these things are too professional, not to mention our strengths." ”

"Then what kind of operation method did you bring this time?" Gu Chen was also curious, curious about how this technology should be implemented.

Gao Xu glanced at Liao Kai beside him.

The two nodded.

Then, Gao Xu opened his backpack, put a laptop on the table, and said: "Losing a child is a pain that no family can bear, and it is very difficult to find clues in the vast sea of people." ”

"Yes, it's like looking for a needle in a haystack. Officer Wang drank his drink and kept his eyes on Gao Xu's computer.

"Therefore, the latest face recognition technology can allow artificial intelligence to deeply learn the growth law of the five senses, and with a photo of a child's childhood, it can realize cross-age face recognition. ”

Gao Xu clicked on his file......

Suddenly, hundreds of face images appeared on the page in the folder.

Lu Weiwei and Officer Wang quickly stood up and walked behind Gao Xu.

"This ...... What is it?" Lu Weiwei wondered, "Is this your technique?"

"It should be said that this is the photo of the abducted little girl when she was two or three years old, and through the combination of the model and the data, in the vast sea of people, we got hundreds of lists of people with a high degree of similarity with the lost child and her parents. Gao Xu said.

Officer Wang said in his mind: "If the age of the little girl who was abducted was three years old, then it is now ten years later, and the little girl will be at least thirteen years old." ”

"That's right, so we used big data to screen out these people, all of whom were about thirteen-year-old girls, and the appearance of these people was the scope of automatic matching and screening by the machine. ”

Gao Xu said, and put the two photos on the table.

"This photo of the little girl before she went missing, she was not yet three years old at the time. ”

Then Gao Xu pointed to another one and said: "This is a face model photo established through the latest face recognition technology and let artificial intelligence deeply learn the growth law of the facial features." ”

"In other words, you built the photos through this model, and then filtered out these hundreds of similar photos?" Gu Chen asked.

"Yes. Liao Kai on the side nodded and said, "This is already a major breakthrough, because we can narrow down the scope of searching." ”

Gu Chen held his chin and hesitated: "You use the existing face recognition system for testing, but the abducted child has been missing for more than ten years, and as the child grows older, the face shape, eyes, mouth corners, forehead, skin and other identification features will change significantly, and the face recognition rate of the machine will also decrease, with a photo of a 3-year-old child, the effect is very unsatisfactory." ”

"Gu Chen, this is already very good. Officer Wang felt that Gu Chen didn't need to chase after him, so he said: "If you can narrow down the scope to a few hundred people, although it will take a lot of time and energy to continue the investigation, it will be much better than searching without a target, at least there is a goal." ”

"I think that's good, too. Lu Weiwei couldn't help but wipe her mouth and said: "If the scope is determined, it is only a matter of time before the abducted child is found. ”

Listening to the encouragement of Officer Wang and Lu Weiwei, Gao Xu nodded excitedly and said with a smile: "To be honest, this time we are facing a lot of pressure, the system jointly developed by the Pengcheng City Bureau and this high-tech enterprise, if it is implemented, it will require a breakthrough in our seven working groups." ”

"But at present, we can only investigate step by step, at first we have been to five cities, nearly 30 people, but the efficiency is not high, this time to Jiangnan City, I hope to make some gains. ”

Liao Kai on the side also said: "Yes, although at present, this new technology is not too mature, but our country is already in the world's first echelon of this technology, the application of this technology, has been able to assist the police, the successful abduction of more than ten years of children search scope greatly narrowed, we are no longer looking for a needle in a haystack." ”

"How long have you been checking?" Gu Chen suddenly asked.

Gao Xu was stunned for a moment, and said with some frustration: "It has been in different cities for 44 days. ”

"44 days?" Gu Chen was a little surprised.

"Yes. Although Liao Kai is very tired, his work attitude is still very serious: "We have been working for 44 days in a row, and many working groups have not achieved corresponding results. ”

"If in the next investigation, the longer we check, the greater the pressure on our working groups and the higher-level technical departments, so everyone is working hard and wants to be the first to get the results. ”

"No wonder you look like you haven't slept well in days. Lu Weiwei smiled and said, "I'll buy you more Red Bull later, you can sleep well in the police dormitory of our Furong Branch tonight, and we will arrange docking work with you tomorrow." ”

"Thank you so much. ”

"You're welcome. ”

After everyone finished dinner, Gu Chen took Gao Xu and Liao Kai to the police dormitory area.

After registering the information of the two, a large standard room was arranged for the two.

"Although there is no comfort in a hotel here, there are all the things that should be there, and if you need any help, you can call my phone number. ”

Gu Chen then informed the two of them of his mobile phone number.

"Thank you so much, Gu Chen. Gao Xu also rubbed his bloodshot eyes, and said with a wry smile: "The two of us haven't had a good night's sleep for 44 days, and the first thing we do when we open our eyes every day is to start checking the information of the people within the range, for fear of delaying time." ”

"Thank you for your efforts. Liao Kai also thanked him for being victimized.

"Everywhere, everyone is a police officer and should help each other. After Gu Chen finished speaking, he said again: "By the way, Gao Xu, can you show me another photo of your little girl?"

Gao Xu was stunned for a moment.

Gu Chen said with a smile: "That's the case, regarding your work docking, Senior Brother Wang may arrange it tomorrow, so I want to know the relevant situation first, if you can show me the information of the abducted and trafficked girl, maybe it will be better." ”

"Haha, so that's the case?" Gao Xu was also hesitant by Gu Chen's sudden concern, but after learning about the situation, he suddenly felt relaxed.

"Okay, then you can take it and take a look, and give it back to me tomorrow. Gao Xu glanced at Liao Kai beside him and said with a smile: "Liao Kai and I have traveled a long way, and I am really tired, so I will take a shower and go to bed later." ”

"Then I wish you all a good dream. After taking the information and photos given by Gao Xu, Gu Chen helped the two close the door and returned directly to their dormitory.

Hesitating about the factor of personnel transfer, Han Yunfei, who lived in the dormitory before, was transferred away with Xiao Yang.

So the four-person dormitory has also become a three-person dormitory, and now only Ding Liang and Huang Zunlong still live here.

When the door was opened, Ding Liang was lying on the bed listening to music, and Huang Zunlong was leaning on the side of the bed.

Normally, at this time, the two of them would go outside for a walk, but today's rainstorm, everyone naturally obediently huddled in the dormitory.

"Gu Chen, what are you holding in your hand?" Huang Zunlong found the file in Gu Chen's hand at a glance.

"Do you want to see the information on abducted and trafficked children?" asked Gu Chen.

Huang Zun Lao waved his hand: "Then forget it, you Gu Chen brought the work back to the dormitory, this habit is not good." ”

"It's enough to solve the case, why do you care so much?" Gu Chen complained casually, threw the information on the desk, and then sat on the chair and flipped through it.

Gu Chen first took out a photo of the little girl when she was two or three years old, and her eyes blinked twice quickly.

With a "click" sound in my head, the photo of the little girl was quickly cut into my mind.

In the visual interface, the left side is shown as a scan, and the right side is displayed as a save.

Gu Chen directly clicked on scan.

Soon, the picture of the little girl was covered by a green grid in the vision, a line with lightning, constantly rising and falling.

"Ding!"

As the scan ended, a crisp ringing rang in my head.

Gu Chen conducted an on-site audit for the first time based on the face recognition skills he mastered.

Soon, next to the original photo, another photo appeared, and it showed that he was four years old.

"Can you really operate like this?" Gu Chen was a little overjoyed, this skill was much faster than he imagined.

Through the locking of the little girl's face shape, eyes, mouth corners, forehead, skin and other identifying features, although the basic point has changed after a year, the basic point has not changed.

"Maybe the direction of cooperation between the police in Pengcheng and high-tech enterprises is also calculated in this regard, right? However, the machine's face recognition rate will decline as the abductee grows older, and the effect is very unsatisfactory with a photo of a 3-year-old child. ”

Gu Chen turned his head to look at Ding Liang and Huang Zunlong behind him.

Neither of them noticed their abnormality, so Gu Chen looked at the second photo again, which was the four-year-old calculus photo of the little girl.

Subsequently, Gu Chen used his face recognition skills again to scan the second photo, so he got a photo of the little girl who was five years old.

So, the third, fourth, until Gu Chen scanned the picture of the little girl being thirteen years old, a clear outline had already appeared in Gu Chen's visual interface.

Gu Chen quickly took the machine calculation photos provided by Gao Xu and Liao Kai for comparison.

It can be said that the gap between the two is quite large.

If the photo provided by Gao Xu and Liao Kai is a general appearance, then Gu Chen used the scanning of his face recognition skills to get a clear photo.

Now his own photos are more accurate than those provided by Gao Xu and Liao Kai.

"That's it. Gu Chen tried several times, but he couldn't extract the photo, so he could only take out a pen and paper from the drawer, and began to use the appearance of the photo in his mind to start sketching on the straw paper.

Half an hour passed......

Gu Chen wiped the sweat from his forehead, feeling that the portrait in his hand was even more vivid.

Compared with the photos simulated by the machine, the appearance given by Gu Chen is obviously more three-dimensional.

"Oh my God, when did we Gu Chen become a great painter?" Ding Liang didn't know when he came behind him, and after seeing the sketch Gu Chen depicted, his whole face was shocked.

Huang Zunlong also came to Gu Chen's side, picked up the sketch, compared it with the photo calculated by the machine, and couldn't help but wonder: "Eh, I said Gu Chen, although your painting is very good, but this is not like the person in this photo?"

"I didn't say I was going to draw according to the film. Gu Chen sketched and nailed the target on the wall with a dart, and then nailed the photo of the machine calculation next to the plain cat.

"Ding Liang, Huang Zunlong, you two help me take a look and give some advice. Gu Chen said.

Ding Liang pondered for a long time with his hands on his chest, and said: "Your sketch is more expressive, like the real thing, and this photo ......"

After hesitating for a few seconds, Ding Liang raised his head and said, "This photo gives me the feeling that it is a bit like a simulated character." ”

Gu Chen said "en", and did not approve or disagree.

Ding Liang actually said to the point, that's right, the new face recognition algorithm simulated by the machine, although the way of cross-age calculation is reliable, but the error is also large.

After letting artificial intelligence deeply learn the growth law of the facial features, the established face model photo can only be a relative existence.

Therefore, if you filter through this cross-age calculus photo, you will get a lot of data.

This is also why Gao Xu and Liao Kai's workload will be so large, the fundamental reason is that the calculation method of this machine will gradually increase with the age of children, and the identification features such as face shape, eyes, mouth corners, forehead, and skin will change significantly.

Therefore, the face recognition rate of the machine will also decrease.

Gu Chen looked at the portrait of his plain cat, and couldn't help but fall into deep thought: "If the recognition rate of the machine calculation will decrease, then I use the face recognition skills I carry to screen one by one, can this photo represent what the three-year-old girl will look like ten years later?"

Although he is not very sure, Gu Chen has already mastered some of the use of face recognition skills.

He now encounters this kind of photo with a certain degree of difficulty and a certain age span, but he no longer only makes judgments based on the existing information.

So, Gu Chen repacked the portrait he sketched in the file bag, and prepared to take it to the office tomorrow to use Gao Xu's computer to compare it to see if the characters he sketched really existed in Gao Xu's computer files.