1995, Starting as a Criminal Investigation Expert

At this moment, Liu Weikun's mind was in a daze.

He had a sudden flash of inspiration, and inspired by Li Shu, he came up with some ideas.

However, the lack of clarity, or rather, the conflict with existing knowledge, has led to confusion in thinking.

"no."

He was somewhat anxious and, no longer concerned about the workers installing the equipment, hurriedly said, "Li Shu, right? Could you please explain the method you described to me again, clearly?"

This involves a large amount of equipment, and assembly will take some time.

At that moment, Li Shu explained his partitioning comparison method in detail.

I also used the metaphor I had thought of before.

That is, in a crowded park, you use a photo to find someone.

Previously, the search was done level by level; now, once you identify someone with a mole on their lip, you can target them specifically.

"what?"

Before Liu Weikun could react, Han Jianjun and the others who were guarding him nearby suddenly brightened up.

Han Jianjun hurriedly said, "Li Shu, your analogy is very apt."

Peng Rong nodded repeatedly.

He had already understood the method that Li Shu had mentioned earlier.

But now, with this analogy, there's a sense of sudden enlightenment, as if the comparison principle is instantly understood.

Liu Weikun also suddenly realized.

"I understand!"

He slapped his thigh.

But clearly, when he said he understood, he wasn't referring to Li Shu's comparison method, but rather that he had grasped something else. He murmured, "I finally understand why my teacher always said to combine theory with practice. This design concept and actual use are different directions."

His words confused Li Shu, who asked him what he meant.

Liu Weikun snapped out of his daze and casually pulled up a chair to sit down.

He felt this was a good opportunity to help people understand the AFIS system.

"How so?"

Liu Weikun tidied his words and then said, "Just like the method Li Shu mentioned, at first glance, it seems to have changed from a global comparison to a local comparison, so my first reaction was that it was a bit like taking off your pants to fart."

Some of Han Jianjun's group nodded in agreement.

When Li Shu mentioned this method before, they had this feeling that it was just an adjustment in direction and nothing special.

Liu Weikun continued, "Logically speaking, we should have been able to think of this when we were doing research and development, but we just didn't. I'm only now realizing why."

"Because when we were doing research and development, our goal was to create a fully automated, user-friendly comparison system."

In other words, once your fingerprint is entered, the result is automatically generated without human intervention.

"All our research and development is for this goal: to build a universal mathematical model to solve all problems."

"But you are different. In actual case handling, we think about more things. Let me give you an example."

He rolled his eyes and pointed to a microcomputer next to him, saying, "Let's put it this way, our research and development goal is to build a computer, to create a tool."

"And you are the users. You can write programs, run models, and do many things with this computer. In this process, Li Shu's method is like a skilled programmer who has developed a sophisticated program that we developers could not have imagined."

"So you understand the difference?"

He asked the crowd a question in return.

Han Jianjun and the others looked at each other in bewilderment.

Zhao Yong wanted to remind him that he could avoid using the computer analogy. He knew how to turn on a computer, but he didn't understand what programs meant.

Li Shu understood what Liu Weikun was trying to say, but he didn't quite grasp what Liu Weikun was trying to convey.

"You idiot."

Liu Weikun's words were as blood pressure-raising as ever: "What I mean is, we can cooperate to make this system even more powerful."

In the mid-to-late 1980s, in order to catch up with foreign countries, China began to take the lead in developing domestically produced fingerprint comparison systems.

In the early stages of research and development, we not only imitated the functions of foreign systems, but also considered the needs of actual combat. We also learned from the Anjing Criminal Research Institute and tried to start from the needs and apply them to actual work.

Finally, it was successfully developed and put into production in 93.

However, despite claiming that it was combined with actual combat needs, Liu Weikun realized that the research and development process might have only dealt with ordinary needs.

Or rather, they encountered ordinary programmers, rather than brilliant programmers like Li Shu, who could come up with innovative solutions.

Therefore, Liu Weikun realized that only by cooperating with fingerprint comparison experts like Li Shu could this system become stronger.

Therefore, a partition comparison method can potentially improve the system's success rate in matching incomplete fingerprints.

"So, brother, this is what we call 'two swords combined'."

Liu Weikun looked excited and shouted that as long as the cooperation was successful, they could take down Tsinghua University.

The team led by Academician Shi from Peking University was among the first in China to begin research and development.

However, at the same time, there is also a team at Tsinghua University that is doing similar research and development.

These are natural competitors.

If we could develop a more powerful comparison system ourselves, then...

Liu Weikun recalled the faces of those people from Tsinghua University and couldn't help but start fantasizing about how he would show off in front of them.

Of course, this is on the premise that Li Shu...

Only fingerprint matching experts can help optimize their systems.

"Brother, you have to help me."

This guy's mind works fast; in no time, his attitude had changed again and again. Now he was grabbing Li Shu's hand and looking at Li Shu with shining eyes.

Li Shu awkwardly withdrew his hand and said, "Why don't you assemble the machine first?"

The system isn't assembled properly; saying all this is superfluous.

The equipment assembly is progressing quickly.

As dawn broke, around six o'clock, the assembly was complete.

This is just the initial assembly; the wiring and other details will need further adjustment later.

But we have to get it working first; the case won't wait for anyone.

Tang Weidong felt the pressure of the headband tightening, and another day was about to pass.

The system booted up and debugged normally.

But this is just the beginning. For it to work, there is another essential step: to input all 160,000 existing fingerprint cards into the system and establish a database.

At this point, Li Shu proposed his own fingerprint database encoding method.

"Moreover, it's not just about coding, but also about comparison. We have cases in hand now, and I think we can make some optimizations."

The system has quite a few methods.

It can only be said that the younger generation really went to great lengths and explored a lot of methods in order to solve the case.

Seeing that everyone was looking at him, Li Shu explained, "What I mean is, we're in a hurry to implement this system because we want to solve cases."

"Then we can use the specific characteristics of the suspects to selectively filter out a batch of fingerprint cards, input them into the system first, and then start comparing them directly, which will speed up the process."

Some react quickly.

As soon as Li Shu said this, Han Jianjun understood and hurriedly said, "Li Shu, do you mean that we should prioritize recording the fingerprints of men who are between 1.7 and 1.8 meters tall?"

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

If there are certain characteristics of the suspects, then we can conduct a preliminary screening.

"And it's not just height, but also weight and age; these can all be used as screening criteria," Li said.

Sixteen thousand fingerprint cards; we can gradually add them in later.

Right now, we definitely need to prioritize screening, reduce the workload, and start comparing as soon as possible.

"Damn, bro, you're awesome."

Liu Weikun was pondering Li Shu's fingerprint encoding method when he heard Li Shu propose such a method, and his eyes lit up. He thought to himself that Li Shu was a master.