1995, Starting as a Criminal Investigation Expert

This is not a competitive event; there can only be one champion.

Of course, if you do a good job and solve a major case, you will definitely be rewarded.

But receiving this kind of commendation doesn't necessarily mean you'll get promoted faster.

It's very difficult to get promoted.

Getting a police rank is even more difficult now. The regulations were introduced in 92 and are now fixed. Police ranks can only be promoted every few years. No matter how many merits and awards you receive, you still have to wait out the required number of years.

Therefore, Li Shu had no reason to keep secrets just because he wanted to make a contribution.

Moreover, Li Shu himself is not a selfish person. Without Zhao Yong even asking, once he figured out the secret, Li Shu would share it on his own initiative.

"Brother Yong, look, this is a method I figured out myself at school. Using this homemade locator can improve the efficiency of comparison."

Li Shu stood up and made way for Zhao Yong to sit down, then explained to him how the locator was made and the principle of comparison.

Li Shu and Tan Guoxiong's tables were placed side by side, facing each other.

In fact, he had just noticed that Li Shu was very fast at comparing data.

At the time, there were some concerns that Li Shu might be pursuing speed at the expense of accuracy.

The two had been together for three years and knew each other very well.

During his school years, Li Shu was a very motivated person who participated in various school activities and performed actively.

I can't do it because of my own personality, but I can't help but worry about Li Shu, fearing that he might be too eager for quick success.

But now that I've listened carefully, I realize it's not what I thought.

Positioner?

Tan Guoxiong put down his hoof-shaped goggles and looked over curiously.

At school, their dorm rooms were diagonally opposite each other, so how could he not know that Li Shu had figured out some kind of locator method?

"Slow down!"

Zhao Yong waved his hand to interrupt Li Shu. Perhaps because he had been staying up too late, his mind hadn't quite caught up, and he hadn't grasped the core principle of the locator.

So let Li Shu slow down and repeat it again.

"Brother Yong, it's about the position."

Li Shu pointed out incisively, "Think about it, we extracted several recognizable feature points. Their positional relationships are fixed. The feature points might match up, but the relationship is fundamental and will definitely not be wrong."

"Therefore, by using this overlapping comparison method, we can quickly complete the screening and improve efficiency."

While Zhao Yong was still pondering, Tan Guoxiong, the young man opposite him, immediately realized what was going on.

"Location……"

He muttered to himself, then looked at the simple locator again, and suddenly his eyes widened. He realized what it meant.

At this moment, Zhao Yong thought carefully and had grasped the key point.

"In other words..."

He picked up the locator, slipped it onto the fingerprint card, moved it slowly, and stared at the fixed hole. Suddenly, everything became clear.

"Wait a minute."

Zhao Yong was a bit flustered, frantically searching for something, when he caught sight of Li Shu's Seagull watch. He hurriedly asked Li Shu to time him, wanting to personally test whether this method could really improve efficiency.

As a veteran, Zhao Yong is very experienced and his comparison speed is very fast.

Once his eyes were pressed against the horseshoe mirror, his body seemed welded to its spot, moving at a steady pace across the file card while his other hand made blind notes.

He completed the comparison in 38 seconds.

After asking how long it had been, they finally picked up the locator and started comparing it.

First, get a general idea of ​​the core points.

Fingerprints are only so big; there may be some deviation, but the deviation is limited.

Once you've roughly identified the core point, use that location as the center and move around in a small area.

First, check if there are any matching characteristics.

If not, then there is no need to proceed to the next step of comparing positional relationships.

In this process, you no longer focus on the overall similarity, but rather on the details. Even if the extracted feature points are insufficient and the probability of similarity is high, you can still filter by positional relationships.

If the position is wrong, then it's definitely wrong.

"how long?"

Zhao Yong looked up and asked.

Li Shudao: "29."

Upon hearing this number, Zhao Yong gasped, quite surprised.

First of all, there has been a real improvement in terms of time.

Moreover, he knew he could do it even faster, since he was new to the job and not yet familiar with the comparison process.

He quickly estimated in his mind that if he became more familiar with the process, or optimized it, or even the production of the locator, it could be done even faster.

Even in half the time.

And this is just the kind of fingerprint that obviously doesn't match.

Traditional methods sometimes match four or five features.

At this point, you need to look for the features one by one and compare them slowly.

The time frame is suddenly stretched out, possibly taking several minutes or even longer, as you repeatedly compare the results to see if they match.

This is the most time-consuming situation.

Zhao Yong felt that Li Shu's method would allow for a faster screening process under these circumstances.

Just as Li Shu said, even if the features match, the positional relationship must be absolute.

If the positions are wrong, then they will definitely not match.

Therefore, efficiency is not as simple as just doubling.

But it was just an idea, and I only tried it once.

Zhao Yong gave Li Shu a deep look, then without saying a word, grabbed the fingerprint card and continued testing.

One, two...

With each test, Zhao Yong grew increasingly excited.

He could tell from his own experience that the speed was fast.

By using fixed positional relationships, differences can be quickly identified.

He also began to wonder if this method might have any flaws.

For example, too few feature points are extracted.

Li Shu extracted five feature points. Is it possible that these five feature points not only match perfectly but also overlap in position, while the other features are incorrect?

Even if the point of the poke is too large, it can still cause deviations and have an impact.

After all, fingerprint lines are made at the micrometer level.

But he immediately rejected the idea.

It doesn't depend on the number of features.

First, considering the five feature points and the probability of their positions, the probability of matching them all would be far lower than 2 to the power of 10.

And this is just for quick filtering.

If they all match, manual comparison is still required.

Li Shu's method simply simplifies the complex intermediate comparison process without affecting the final accuracy.

Thinking of this, Zhao Yong put down his hoof-shaped mirror, his face already showing barely concealed excitement.

"Li Shu, you're something else!"

He gave a thumbs up and said just that one sentence, his excitement already overflowing.

Before Li Shu could reply, Zhao Yong had already stood up and told everyone to stop.

"Come here, everyone!"

He eagerly beckoned everyone to gather around.

Everyone was busy with their own work, completely absorbed and oblivious to what was happening here.

Those who didn't know what was going on gathered around and learned that Li Shu had come up with some so-called feature point positioning method.

"What method?"

Someone asked, looking bewildered.

Everyone else had a similar reaction.

In their minds, there's only one way to compare fingerprints: by visual inspection.

Perhaps with more exposure and experience, one becomes more skilled and can quickly locate something with just a glance.

There are absolutely no shortcuts.

Now, in Zhao Yong's words, Li Shu has actually come up with some kind of comparison method that can multiply efficiency.

Many times over!

Is this really necessary?

The key point is that Li Shu is a recent graduate and a new employee.

Everyone looked at Li Shu in confusion.

Zhao Yong quickly explained the key to the location, and seeing that everyone was still in a hurry to react, he picked up the fingerprint card and demonstrated it to everyone on the spot.

The intricacies of this method will be explained through demonstration.

When you find the right method, you really get that sudden sense of enlightenment.

It's like finding the derivative in mathematics.

You racked your brains, calculated for ages, and finally figured it out.

At this point, someone tells you about L'Hôpital's rule, which makes complex calculations a breeze.

That feeling is probably just like suddenly learning a forbidden spell; the impact it brings is enormous.

Now that everyone has watched it several times and understood it, this is the feeling they have.

A colleague stared wide-eyed, his scalp tingling, and exclaimed, "My God, is this even possible?"