"Last night, at around nine o'clock, Wang forced himself to have sexual intercourse with the victim, Xiao Yao, who was 16 years old at the time, in the east classroom on the sixth floor of the teaching building of a certain foreign language school in Changping District. Due to fear of Xiao Yao reporting the incident, Wang strangled her neck, causing her to die from mechanical asphyxiation, and took her phone."

This is a major criminal case that many people in the Changping District Public Security Bureau are currently involved in.

In the early hours of today, Xiao Yao's mother received a call from a teacher at the school, saying that when they checked the dormitories, they found that Xiao Yao and her boyfriend were not in the dormitory.

The school will take serious disciplinary action on this matter, so they called to consult with the parents.

Xiao Yao's mother was initially very angry, but soon began to feel uneasy.

Firstly, she couldn't reach her daughter's phone, and secondly, she felt that something was wrong. Her daughter had always been focused on her studies as she had a strong desire to study abroad.

She even stayed at a boarding school away from her hometown to study English. How could she have the leisure to date someone at this time?

They were chatting during dinner, but halfway through the conversation, her daughter stopped replying.

The feeling of unease intensified. Xiao Yao's mother, Li, decided to drive from her hometown to Yan Jing overnight.

During the journey, Li kept trying to contact the school, hoping they could help find Xiao Yao.

Unfortunately, the news she received this morning was the death of her daughter.

Xiao Yao's body was found on Thursday morning at around 6 o'clock in Classroom 601 of the New Oriental Teaching Building.

The first person to discover Xiao Yao was her classmate, Liu. Liu stated that Xiao Yao's head was facing north and her feet were facing south, with her head covered by the school uniform.

Subsequently, four other students came to the entrance of Classroom 601. Initially, they thought she was sleeping and asked the people who came later to be quiet and not wake her up.

They didn't know that Xiao Yao would never wake up again.

The perpetrator, Wang, was an ordinary student, and the act of violence was not premeditated. After the incident, Wang disappeared from the school, making him the prime suspect identified by the police.

"Many students have provided testimonies and evidence. Wang has been repeatedly harassing Xiao Yao in the past few months. In the surveillance video from last night, we have found sufficient evidence."

By the time Wang Kai was waiting outside, the police had already gathered sufficient evidence, and it was only a matter of time before they arrested him.

"This is not a difficult case. From the perspective of solving the case, it belongs to the easier category. The incident was reported to the police within a few hours, and we quickly obtained enough evidence to identify the prime suspect. Capturing the murderer is just a matter of time."

"The faster we act, the shorter the distance the murderer can escape, and the less we need to investigate. Therefore, it may not be convenient to discuss your new technology today." Director Tian said, implying that it was time for them to leave.

"Our current task is to focus on the school, using on-site visits and surveillance video investigations to find Wang's whereabouts and apprehend him as soon as possible."

Director Tian attached great importance to this case. The act of violence taking place in the school where students and teachers usually attend classes and work was completely different from committing a crime in a remote area.

The most important thing was to ensure public safety and restore public confidence by capturing the murderer as quickly as possible.

Of course, on the other hand, Director Tian had only two years left before the leadership transition. He was still hoping to be transferred to the Municipal Public Security Bureau in 15 years.

Public opinion had already begun to ferment rapidly, and he had to handle this matter well.

As for new technologies and the like, although they were achievements, they could be discussed later.

"Director Tian, do we have a lot of surveillance videos to investigate?" Wang Kai had already forgotten the unpleasant wait earlier. He vaguely felt that this might be a good opportunity.

Although Baidu currently did not have the capability to add target tracking functionality based on Meng Fanqi's technology, let alone achieve the government's requirement of multi-target vehicle tracking.

But in Meng Fanqi's code, it was easy to add a function that would alert when a specified type (such as a human) of target appeared in the image. For example, if a human was detected in the image, the frame would undergo some brightness changes.

Dozens of surveillance screens were usually dark, but they would light up when a person was detected, which could greatly save manpower.

This was especially true in terms of security. If a criminal case of a similar nature occurred, the police often needed to thoroughly investigate the surrounding cameras, and time was often extremely tight.

Due to the urgency of solving the case, the pressure was high, and the nature of the event was severe, it was often inconvenient to fast forward and jump frequently during the surveillance investigation.

Missing a fleeting clue would be a great mistake.

Wang Kai wanted to directly apply Meng Fanqi's real-time detection technology to assist in the investigation of this case."From the time the incident occurred until now, each camera has about fifteen hours of footage that needs to be checked. As it stands, the surveillance videos related to the case that need to be checked are close to a hundred, and if we're unlucky, even more."

Director Tian also felt a headache. Even if they were to check at three times the speed, a person could only clear a portion of the surveillance footage in five hours.

It might take twenty to thirty people a whole day to thoroughly check all this content.

Of course, this is the worst-case scenario. Once the suspect's traces are found, the time and place that need to be checked can be determined, and the remaining workload can be significantly reduced.

However, they are often not so lucky, and it often takes checking fifty to sixty percent of the surveillance footage to initially find the suspect's traces.

If we go by half, it would take twenty to thirty people working until late tonight to initially find the suspect.

"Director Tian, our technology can greatly speed up your investigation efficiency." After hearing Director Tian's words, Wang Kai saw this as a great opportunity.

Humans can only watch videos at low multiples, but machines are different. As long as the computational speed is fast enough, machines can observe videos at hundreds or thousands of times the speed without missing a single frame.

The current Baidu accelerated version of the lightweight YOLO real-time detection algorithm can achieve a detection speed of over 300 FPS on low-resolution or single-channel videos.

And the frame rate of surveillance footage is often only 20-30, which means that a single graphics card can achieve ten times the viewing speed.

Moreover, Baidu has more than just twenty or thirty graphics cards.

To give the government a good impression, it's easy for Baidu to pull out a thousand graphics cards for this task.

Each video is divided into ten parts, each less than two hours. A single card can analyze it, and in just over ten minutes, all segments where people appear can be marked.

The result that might have taken a whole team from noon until midnight to achieve can be obtained in just over ten minutes.

Adding in the time for mobile data, code tweaking, and testing, it won't exceed an hour and a half at most.

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There won't be many segments where people flash by in the video at the early morning time point.

The police can then check these key segments, requiring less than one percent of the original effort.