I don't want to solve the case when I'm a little policeman.

Chapter 18 Xu Zheng's Sharing Lesson
Xu Zheng watched the video again, then cut off the evidence in his hand and saved it to a USB flash drive. He finally relaxed. He suddenly felt as if he had run [-] meters. His whole body was sore and his head was even more painful. Excitement suppressed these discomforts, he took a deep breath to calm himself down, and his expression was in place.

In fact, the atmosphere of the Liulihe Police Station is very good, not to mention others, anyway, Xu Zheng feels like home, but Xu Zheng also knows what to pay attention to. He has been busy for two days and got nothing. You just watched the video all afternoon. , So, at this time, you can't make a show, who makes yourself young.

One afternoon passed, and at this time the conference room was having a meeting to study strategies. Today's squatting only squatted in the air. Maybe the suspect has stopped doing it. This is the most troublesome thing.

In fact, to solve this case is simple and easy, and it is also difficult to say, because there are camera videos, and there will always be results after checking one by one. The difficulty is that it is too wasteful of time and police force. This is the last resort.

Knowing that they were in a meeting, Xu Zheng hesitated for a moment and didn't open the door to go in. He couldn't slap his face in public, right? He returned to his desk, took out a piece of paper, pencil, and meter stick, and first drew a sketch of the stolen shop. Then the main passage and the three shops on the opposite side, and then marked the camera, and wrote the approximate data he estimated.
After a while, Deputy Director Cao Lijun and the others finished their meeting and found that Xu Zheng had come out of the investigation team's office. Video is also a waste of effort.

But when he saw Xu Zheng sitting on a chair with a relaxed face and drawing something, the old criminal policeman's observation ability was not covered, and he understood that Xu Zheng must have gained something this afternoon.

"Xu Zheng, how's it going? Is there any result?"

Cao Lijun has a calm personality, he is decisive and does not procrastinate, and he will directly order him when he has something to do. Therefore, as a subordinate, Xu Zheng did not dare to smooth things over with him, so he said it directly, "Cao Suo, fortunately, I think there is a clue, and I have to rely on you." Come and help me verify."

People carried people in bridal sedan chairs, and Cao Lijun smiled unconsciously on his serious face, "Good boy, it was rumored in the institute that you realized it, but I didn't expect that you also realized the technology of analyzing videos. You can't be judged by appearances. Come on, let me Take a look at the results of your afternoon."

Xu Zheng knew what Cao Lijun wanted, so he didn't dare to delay. He turned on the computer and played the evidence he cut out.

In fact, the complete evidence video requires the videos of four cameras to be played at the same time at the same time, and can only be seen by watching them together. Xu Zheng's video was obviously processed by him, and it cannot be used as direct evidence during the trial process, but this Now that's the real proof.

Cao Lijun is a veteran in handling cases. He saw the clues when he saw the video cut by Xu Zheng, but this is not important, as long as the original video is not lost. Now he can clearly see that this man and woman are the suspects. Cao Lijun was very excited, and patted Xu Zheng on the shoulder with his big hand, "It's really good. Did Xu Zhengyi use multiple combinations of video observations?"

Seeing Xu Zheng nodding his head, Cao Lijun sighed, "We used it at the time, but we just didn't find it. Is there some trick in it?"

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

Seeing that Xu Zheng was about to make a long speech, Cao Lijun quickly interrupted him, "That's it, Xu Zheng, wait a minute, I'll call all of us who are free now, and you can pass on your experience to everyone, okay?"

Xu Zheng nodded, this is the tradition of Liulihe, who has been a policeman for so many years without a unique skill, some are good at tracking, some are good at reasoning, and some are good at handling 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 eyes, 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 became complicated.

Cao Lijun frowned obviously. It seemed that there was another story in it, but now that there was a video of the suspect, Xu Zheng cut out the high-definition headshots of these three people in the video. These were obviously three young people. The age may still be a student at school, and as long as the original video can pass as evidence, the arrest warrants for these three people can be issued on the intranet.

"Xiaozheng, has facial recognition been performed on their photos?"

Xu Zheng shook his head, "Didn't we do this together after you are sure?"

"You have a lot of thoughts, kid." Cao Lijun, who usually likes to have a straight face, was very happy now. He opened the police communication while talking. As the facial recognition began, Cao Lijun was both happy and worried.

In fact, it does not mean that the police can find this person on the intranet if they have a photo. If they have a criminal record, they can still find this person by following the clues. I am afraid that they are pure white households, that is, the kind who have not even entered the police station or even recorded their fingerprints. People who have lived in the past, this kind of people are basically impossible to find on the Internet.

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

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

And this time, the video showed that the things she stole were only worth 400 yuan. Did she know the law and knew that this amount was not enough to detain her?

Or is she itchy?

Xu Zheng took a closer look. Lu Yue, 22 years old, Donghai Province... Tsk, he is so young, he must be a college student.

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

Xu Zheng was taken aback. It turns out that there are systematic rewards for completing such a small case. It's just elementary psychology. Xu Zheng himself estimated that he has almost reached it.

better than nothing.

"Xiaozheng, don't be dazed, go, go to the big conference room, and share with everyone the observation method of multi-combined video."

When we arrived at the big meeting room, the policemen who were at home rushed over after a while, and everyone was even more curious when they learned that it was Xu Zheng who shared his unique skill today. For the detailed information of the suspect, everyone applauded Xu Zheng.

Xu Zheng hastened to be polite, looked at the time, he was going to get off work in half an hour, he was going to explain this principle to everyone in a simple way, how much he could understand, it was up to them.

He started by talking about how large an area can be covered by several different types of cameras. Taking this case as an example, he talked about the process of how to find the suspect.

First judge the dead corner of the store, and then reversely deduce the camera that can capture this place through this dead corner.

"You can use this blind spot as a starting point to create a three-dimensional map, and set it as XYZ three spatial punctuation points from three directions, that is, the front, left and right, respectively. The camera in the mall can estimate the XY value, and then only Z The data, through the triple integral calculation, calculate the Z data point to know which camera can capture this blind spot. Here is a triple integral formula, please take a look."

After Xu Zheng finished writing the formula, he looked back and saw that the meeting room where seven or eight people were sitting was empty. In the blink of an eye, all the people left. "This is my first time giving a lecture, it's too embarrassing!"

(End of this chapter)