Xu Zheng watched the video again, and then intercepted the evidence in his hand and saved it to the USB flash drive, he finally relaxed, and suddenly felt like he had run 10,000 meters, his whole body ached, and his head was even more headache, but the excitement in his heart suppressed these discomforts, he took a deep breath, calmed himself down, and his expression was in place.

In fact, the atmosphere of the Liulihe Police Station is very good, don't mention others, anyway, Xu Zheng has a feeling of home, but Xu Zheng also knows where he should pay attention, people have been busy for two days and have nothing to gain, you have watched the video for an afternoon, so you can't make it public at this time, who makes yourself young.

An afternoon has passed, and at this time there is a meeting in the conference room to study strategies, and today's squatting guard is only squatting in the air, maybe the suspect has stopped doing it, and this is the most troublesome thing.

In fact, it is easy to say that it is easy to solve this case, but it is also difficult to say, because there is camera video, and there will always be results in one by one, and the difficulty is that it is too much waste of time and police force, and this is the last way to do it.

Xu Zheng knew that they were in a meeting, hesitated for a moment and didn't push the door in, he couldn't slap his face in public, right, he returned to his desk, took out a piece of paper, pencil, and meter ruler, first drew a sketch of the stolen store, then the large passage and the three shops opposite, and then marked the camera, and wrote down the approximate data of his estimate...

After a while, Deputy Director Cao Lijun and they finished the meeting and found that Xu Zheng had walked out of the office of the visual investigation team, Cao Lijun glanced at Xu Zheng, and didn't want to greet him, after all, he also felt that Xu Zheng was just a waste of effort to watch the video again.

But seeing Xu Zheng sitting on the chair with a relaxed face and drawing something, the old criminal policeman's observation power was not covered, and he understood that Xu Zheng would definitely gain something this afternoon.

"Xu Zheng, how is it, is there a result?"

Cao Lijun has a calm personality, acts decisively and does not procrastinate, and he will directly order if there is something, so as a subordinate, Xu Zheng did not dare to play a round with him, so he said directly, "Cao Suo, fortunately, I don't disgrace my life, I think there is a clue, and you have to help verify it." ”

The sedan chair carried people, and Cao Lijun's unsmiling face unconsciously showed a smile, "Good boy, it was rumored that you had realized it before, but I didn't expect that the technology of analyzing videos was also understood, and people should not be good-looking." Come, let me see what you did in the afternoon. ”

Xu Zheng knew the result that Cao Lijun wanted, so he didn't dare to delay, and directly turned on the computer to play the evidence he cut out.

In fact, the complete evidence video needs to be played at the same time in the video of the four cameras at the same time, and it must be seen together to be seen, Xu Zheng's video is obviously processed by him, and it cannot be used as direct evidence in the process of handling the case, but at this time this is real evidence.

Cao Lijun is a veteran in handling cases, and when he saw the video cut by Xu Zheng, he obviously saw the clues, but it didn't matter, only the original video was not lost, and now he could obviously see that this man and woman were the suspects, Cao Lijun was very excited, and patted Xu Zheng on the shoulder with his big hand, "It's really good, Xu Zheng, did you use multiple combinations of video observations?" ”

Seeing Xu Zheng nodding, Cao Lijun sighed, "We also used it at that time, but we didn't find it, is there any skill in it?" ”

"That's for sure, it's actually very simple, it's a matter of data analysis, and of course, experience..."

Seeing that Xu Zheng was about to make a tirade, Cao Lijun hurriedly interrupted him, "That's it, Xu Zheng, wait a minute, I'll call all the people we have available now, and you can teach everyone the experience, okay?"

Xu Zheng nodded, this is the tradition of Liulihe, who has been a policeman for so many years has no unique skills in his hands, some are good at tracking, some are good at reasoning, and some are good at dealing with neighborhood disputes...

"Cao Suo, I still have something to say, don't worry, you can continue to watch this video."

Under Cao Lijun's puzzled gaze, as the video played second by second, it turned out that there was another suspect, and it seemed that this suspect was the main culprit, and the relationship was complicated.

Cao Lijun frowned obviously, it seems that there is still a story in this, but now that there is a suspect video, Xu Zheng intercepted the high-definition avatars of these three people in the video, this is obviously three young people, looking at the age may still be students, and then as long as the original video can be passed as evidence, the arrest warrants of these three people can be released on the intranet.

"Xiaozheng, have their photos been facialized?"

Xu Zheng shook his head, "Isn't this something to be done together after you are sure?"

"You kid has a lot on his mind." Cao Lijun, who usually likes to keep a straight face, is very happy today, and opens the police communication while talking, and with the start of facial recognition, Cao Lijun is happy and worried in his heart.

In fact, it doesn't mean that with a photo, the police can find this person on the intranet, if there is a criminal record, and this person can still be found in the end, I am afraid that it is a pure white household, that is, the kind of person who has not even entered the police station or even recorded his fingerprints, this kind of person is basically not found on the Internet.

What made Cao Lijun happy was that there were three people on record, and only the woman in the front team of men and women was the woman.

It shows that she stole more than 200 yuan from a supermarket last year, returned the stolen goods and fines, and notified her parents and school.

And this time, it seems that the things she stole in the video are worth three or four hundred yuan, does she know the law and know that this amount of money is not enough to detain her?

Or is she having itchy hands?

Xu Zheng took a closer look, Lu Yue, 22 years old, Donghai Province... Tsk, such a young man, I guess it's really a college student.

At this time, Xu Zheng suddenly heard a sound in his mind... [Ding, congratulations to the host for successfully finding the suspect in the theft of the mall, Lu Yue, and the system rewards the host for the use of primary psychology techniques. 】

Xu Zheng was stunned, it turned out that there was also a systematic reward for completing such a small case, but the primary psychology, Xu Zheng himself estimated that it was almost reached, after all, who is a police officer who does not study psychology.

Better than nothing.

"Xiaozheng, don't be stunned, let's go, go to the big conference room, you can share with us the observation method of multi-combination video."

When they arrived at the large conference room, the police at home after a while rushed over, and learned that it was Xu Zheng who shared his unique skills today, and everyone was more curious, after Cao Lijun showed Xu Zheng's achievements in the afternoon, especially after he had mastered the details of a suspect, everyone applauded Xu Zheng.

Xu Zheng hurriedly said politely, looking at the time, there was still half an hour to get off work, he was going to simply explain this principle to everyone, and it was up to them to understand how much.

He started with how much of an area can be covered with several different types of cameras, and in this case, he talked about the process of how to find a suspect.

First, the blind spot of the store is determined, and then the camera that can be photographed by reverse extrapolation of this blind spot.

"You can take this dead angle as a starting point to establish a three-dimensional map, respectively from the three directions, that is, in front, left and right, respectively, set to XYZ three space punctuation, the height of the camera in the shopping mall can estimate the XY value, then there is only Z data, through triple integral calculation, calculate the data point of Z to know which camera can shoot this blind spot. There's a formula for triple integrals, you see..."

Xu Zheng finished writing the formula, and when he looked back, the conference room that was originally sitting with seven or eight people was empty, and in the blink of an eye, everyone was gone, "This is my first lecture, it's too shameless!" ”