1995, Starting as a Criminal Investigation Expert

With the plan set, the next step is to dismantle the car.

We disassembled everything that could be removed, not only to facilitate fingerprint extraction, but also for the subsequent filming.

The puzzle mode might only be useful for a small, localized area.

That's why the proportions must not be distorted.

So Li Shu and Wang Ze'an worked together to develop the curved surface unfolding system by hand.

First, take photos of the grip.

Even from this position, it would be difficult to extract the image without a curved surface shooting method.

Even now, we have to shoot in segments to piece together fingerprints with the most accurate proportions.

The Second Research Institute truly lives up to its reputation as the pinnacle of domestic criminal investigation technology; its cameras, light sources, and even film are all top-of-the-line.

While they were still filming here, they already had the results over there.

Fingerprints were successfully rendered on the brake lever using ammonia black.

But just as Wang Ze'an worried, it was partially damaged, and most likely due to compression and deformation.

As expected, there's nothing to regret.

Take a section with fingerprints and photograph it using the same method.

Fingerprints were also extracted from the pick on the bell.

This paddle has a relatively gentle curved surface and a certain area, so when you press it with your thumb, you can apply enough force without it shifting.

Unfortunately, the sounds overlapped, indicating that the suspect must have pressed the bell more than once.

Both the rear seat and the spring clip were found, but they were all in the same condition: damaged, and overlapping and sliding were commonplace.

In the end, Tan Ligang was so frustrated he felt his scalp tingle.

In any other case, given this fingerprint pattern, we would have given up long ago.

"Li Shu, are you really sure about this?" a researcher asked.

Presenting fingerprints is already troublesome enough, but then there's the taking of photos. With Li Shu's curved unfolding system, those photos are taken millimeter by millimeter, which is incredibly difficult.

It's not so bad to go through the trouble, but I'm afraid that after all that effort, there will be no result.

Tan Ligang stopped him with a look, then said, "Whether we're confident or not, we'll only know after we try."

You'll never succeed if you don't try.

Everyone understands the principle, but no one is truly confident.

Li Shudao said, "It should be possible. After all, I've done it more than once before, and I also have another idea."

Tan Ligang asked what his thoughts were.

Li Shu raised his right hand and said, "Director Tan, you see, the fingerprints we extracted only cover the five fingers of the right hand. When comparing them with a computer, only one finger can be compared at a time."

"If the fingerprint is relatively complete and has enough characteristic points, then there is no problem. There is no difference between comparing one finger and comparing five fingers."

"But in this situation, I'm worried that the feature points of a single finger are not enough. I was thinking, when comparing with a computer, can we directly compare all five fingers?"

The fingerprint card collects data from all ten fingers, and during the comparison, only the data of the corresponding fingers is selected for comparison.

Everyone present was a genius among geniuses. As soon as Li Shugang finished speaking, Wang Ze'an realized what was going on and said first, "You want to use topological theory to compare all five fingers at the same time to increase the probability of hitting the target."

The original comparison only looked at the features of a single finger.

Now, we compare multiple fingers at once, no longer looking at individual parts, but at the whole, comparing all the features on all five fingers.

According to topological theory, their positional relationships are fixed.

That can also be used to complete the filtering.

Li Shu nodded quickly, that was exactly what he meant.

Tan Ligang understood, frowned and thought for a moment, then said, "Then the program needs to be modified. I don't know if it can be done. Let me ask Academician Shi."

He was naturally familiar with Academician Shi Qingyun, who studied the AFIS system.

After keeping everyone busy, Tan Ligang went out to make a phone call.

"Academician Shi, this is Tan from the Second Institute."

When the call connected, Tan Ligang spoke respectfully and adopted a very humble posture.

He is 46 years old this year and has worked at the Second Research Institute for many years, where he is highly experienced.

However, compared to Shi Qingyun on the other side, she is still far inferior.

One key point is that he is an academician of the Chinese Academy of Sciences and a leading authority in pattern recognition and image processing in China.

"Ligang, hello, hello."

Shi Qingyun's cheerful voice came through the phone.

She is a lady, 59 years old this year, and has a particularly cheerful personality.

After a brief greeting, Tan Ligang quickly got to the point, explaining Li Shu's idea and asking if it could be implemented programmatically.

Shi Qingyun on the other end of the phone was slightly startled and said, "You mean Li Shu? Which Li Shu? The one from Nanjiang? He's in Anjing?"

Wang Ze'an knew that Li Shu had figured out a partition comparison method and helped Shi Qingyun's team upgrade the system.

Tan Ligang only knew about the partitioning comparison method and was unaware of Li Shu's connection with his team. Somewhat surprised, he asked, "Academician Shi, you know Li Shu?"

Shi Qingyun chuckled and said, "Of course I know that. Xiao Wang from your institute asked me about it before."

Tan Ligang hurriedly asked what happened.

Shi Qingyun gave a brief explanation.

"Wow, so the fingerprint matching system upgrade at the station was because of Li Shu?"

Tan Ligang was incredulous when he learned this.

"Of course, I even gave him a bonus."

Shi Qingyun chuckled and then said, "Well, it's not far anyway, I'll go over there in a bit and see him."

It was too far away before, which was inconvenient.

Now that Li Shu has come to Anjing, there's no reason not to see him.

As for Tan Ligang's demands, whether they are feasible or not can only be determined after a face-to-face meeting.

"Okay, okay, I'll wait for you."

Tan Ligang hung up the phone, feeling utterly incredulous.

He shook his head and hurried back to help.

It's only about ten kilometers from Peking University as the crow flies.

Before long, Shi Qingyun arrived at the Second Research Institute with Liu Weikun.

"When did you get here? You didn't even say a word." Liu Weikun punched Li Shu.

The two met again in Matsuura and have kept in touch ever since.

The main reason was that when Li Shu was learning computers on his own, he would ask Liu Weikun for advice on what books to buy.

As she spoke, she quickly introduced Shi Qingyun to Li Shu.

"Hello, Academician Shi."

Looking at the kind grandmother in front of him, Li Shu quickly greeted her.

I couldn't help but be shocked.

An academician!

Furthermore, Anjing is truly a place where hidden talents abound; you can meet important figures anywhere.

"Hello, you're so young. I heard it from Xiao Liu. You're only 21. That's great!"

Shi Qingyun chuckled and praised Li Shu's idea of ​​partitioning and comparing data, saying it was a highlight and even more advanced than foreign systems.

Faced with such authoritative experts, Li Shu could only nod blankly.

Shi Qingyun, an academician, is very busy.

The reasons for my visit are twofold: first, to meet Li Shu in person, and second, to address Li Shu's idea.

In the next room, Li Shu explained his thoughts, or rather, his requests, in detail.

Upon hearing this, Liu Weikun frowned and secretly glared at Li Shu.

I thought to myself, "You've caused me trouble again."

Last time, when I modified the system using the partition comparison method, I stayed up all night writing code, and I don't know how many brain cells I killed.

Now it's happening again.