Xu Zheng watched the video again, then cut out the evidence in his hand and saved it to a USB flash drive. He finally relaxed and felt as if he had run ten thousand meters. His whole body ached, and his head even hurt, but in his heart The excitement suppressed these discomforts. He took a deep breath to calm himself down and kept his expression in place.
In fact, the atmosphere at Liulihe Police Station is very good. Regardless of others, Xu Zheng feels like home anyway, but Xu Zheng also knows what should be paid attention to. They have been busy for two days and got nothing. You can see it after watching the video all afternoon. , Therefore, you can’t show off at this time, who makes yourself young.
An afternoon has passed. At this time, a meeting was being held in the conference room to study strategies. Today's squatting was only in the air. Maybe the suspect has given up. This is the most troublesome thing.
In fact, it is easy to solve this case, but it is difficult to say that it is difficult to solve, because there is camera video, and there will always be results after checking one by one. The difficulty is that it is a waste of time and police resources. This is the last resort.
Xu Zheng knew they were having a meeting, so he hesitated before pushing the door in. He couldn't be slapped in the face in public, right? He returned to his desk, took out a piece of paper, a pencil, and a meter ruler, and first drew a sketch of the stolen shop. Then the main passage and the three shops on the opposite side were marked with cameras and the approximate data he estimated...
After a while, Deputy Director Cao Lijun and the others finished their meeting and found that Xu Zheng had walked out of the office of the visual reconnaissance team. Cao Lijun glanced at Xu Zheng and didn't want to say hello to him. After all, he felt that Xu Zheng was looking at him again. The video is just a waste of effort.
But when he saw Xu Zheng sitting on a chair and drawing something with a relaxed expression, the old detective's observation skills were not limited, and he immediately 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, acts decisively and does not procrastinate. When something happens, he gives direct orders. Therefore, as a subordinate, Xu Zheng did not dare to reconcile with him, so he directly said, "Cao Lijun, fortunately, I have not disgraced my order. I think I have a clue, and I need you." Come and help verify it.”
As the sedan chair was carrying people, a smile appeared on Cao Lijun's serious face unconsciously, "Good boy, it was said in the institute that you have realized it before, but I didn't expect that you also realized the technology of analyzing videos. People should not be judged by their appearance. Come on, let me Look what you accomplished in one 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 had cut out.
In fact, the complete evidence video requires the videos of the four cameras to be played at the same time and watched together to be seen. Xu Zheng's video was obviously processed by him and cannot be used as direct evidence during the case handling process, but this At this time this is conclusive evidence.
Cao Lijun is a veteran in handling cases. He can clearly see the clues when he sees the video cut by Xu Zheng, but it is not important. As long as the original video is not lost, he can clearly see that this man and woman are the suspects. Cao Lijun was very excited and patted Xu Zheng on the shoulder. "It's really good. Xu Zheng, did you use multiple combinations of video observations?"
Seeing Xu Zheng nodding, Cao Lijun sighed, "We used it at the time, but we just didn't find it. Is there any trick in it?"
"That's for sure. It's actually very simple. It's just a matter of data analysis and of course experience..."
Seeing Xu Zheng preparing to make a long speech, Cao Lijun quickly interrupted him, "Okay Xu Zheng, wait a minute, I'll call all of us who are free now, and you can teach everyone your experience, okay?"
Xu Zheng nodded. This is the tradition of Liulihe. After being a policeman for so many years, no one has 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 watching 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 became complicated.
Cao Lijun frowned visibly. It seemed that there was another story here, but now that there was a video of the suspect, Xu Zheng cut out the high-definition avatars of the three people in the video. They were obviously three young people. Looking at They may still be students in school. As long as the original video can be used as evidence, arrest warrants for these three people can be issued on the intranet.
"Xiao Zheng, have their photos been subjected to facial recognition?"
Xu Zheng shook his head, "Don't we wait until you are sure before we do it together?"
"You have a lot on your mind." Cao Lijun, who usually likes to keep a straight face, was very happy now. He opened the police app while talking. As facial recognition started, Cao Lijun felt happy and worried at the same time.
In fact, it does not mean that the police can find this person on the intranet with photos. If they have a criminal record and follow the clues, they can still find this person, even if it is a pure white person, the kind who has not even been to the police station or even recorded his fingerprints. People who have experienced it are basically impossible to find on the Internet.
What makes Cao Lijun happy is that there are three people on the record, and only the woman in the front group of men and women is the one.
What is shown above is that she stole more than 200 yuan from a supermarket last year. At that time, she returned the stolen goods and a fine, and notified her parents and school.
And this time, the video showed that the items she stole were only worth three to four hundred yuan. Did she know the law and know that this amount was not enough to detain her?
Or is it because her hands are itchy?
Xu Zheng took a closer look, Lu Yue, 22 years old, Donghai Province... Tsk, such a young person, 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 mall theft case. The system rewards the host for his junior psychology application skills. 】
Xu Zheng was stunned. It turns out that there are systematic rewards for completing such a small case. It was just elementary psychology. Xu Zheng himself probably had almost reached it. After all, who among the policemen didn't want to learn psychology?
better than nothing.
"Xiao Zheng, don't be stunned. Let's go to the big conference room. You can share with everyone the observation method of multi-combination videos."
After arriving at the large conference room, the policemen who were at home soon rushed over. They learned that the person sharing his unique skills today was Xu Zheng. Everyone was even more curious. After Cao Lijun showed everyone Xu Zheng’s achievements in the afternoon, especially one who had already mastered Everyone applauded Xu Zheng when the suspect's details were revealed.
Xu Zheng was polite for a while and looked at the time. He would get off work in half an hour. He was going to briefly explain this principle to everyone. How much they can understand it depends on themselves.
He started by talking about how large an area can be covered by using several different types of cameras. Taking this case as an example, he talked about the process of discovering a suspect.
First determine the blind spot of the store, and then use this blind spot to infer the camera that can capture this place.
"You can use this blind spot as a starting point to create a three-dimensional stereogram. From three directions, that is, straight ahead, left and right front, respectively, set as three spatial points of XYZ. The camera in the mall can estimate the XY value, so the remaining Z The data is calculated through triple integral. Calculate the data point of Z and you will know which camera can capture this blind spot. There is a triple integral formula for you to take a look at..."
After Xu Zheng finished writing the formula, he looked back and saw that the conference room where seven or eight people were sitting was actually empty. In the blink of an eye, everyone was gone. "This is my first time giving a lecture. It's so disrespectful!"
