After lunch, more than a dozen people did not go back to rest, and the atmosphere in the fingerprint battle conference room was a little depressing.

It's as if before a storm, heavy clouds weigh overhead, there is no wind, no rain, only breathless depression.

The words of the king just now made everyone's mood a little heavy.

Lu Chuan sighed and forced himself to focus on the computer screen.

Fortunately, the case was solved.

The child's spirit in heaven will finally rest in peace.

The third case.

After the battle, there were more than 80 murders in the fingerprint bank, and Lu Chuan excluded a few in Haizhou City, and after he made a comparison last month and did not find the target fingerprint in the system, he randomly selected one.

This time, the fingerprints are a little blurry compared to the previous two.

Only the narrow one is less than half a centimeter wide.

The crest lines twisted and squeezed together, and the whole fingerprint seemed to be flattened by the crack in the door.

Fortunately, although the fingerprint lines are squeezed together, they are not very blurry.

This time, Lu Chuan did not adopt layered image processing, but needed to stretch and deform to widen the narrow fingerprint and turn it into a normal fingerprint.

In this case, it is difficult to use mathematical transformation methods to work.

Because the fingerprint lines are relatively clear, they are just squeezed together, and such fingerprints have special analysis methods in Lu Chuan's advanced fingerprint identification and analysis skills.

That is, according to the regular characteristics of the fingerprint, stretching.

Although each person's fingerprint is unique, there are still certain rules for the growth and development of fingerprints for people of different ages and genders.

The length of the crest line and the width of the interval are all probably determined.

What Lu Chuan needs to do now is to roughly judge the width law between the fingerprint ridges according to the length of the fingerprint and the width of the ridge line, so as to stretch the fingerprint.

This is also what other experts who have studied this fingerprint have done.

However, compared with the technical pre-processing of fingerprints, this kind of fingerprint processing method is more experience-testing.

Only after experiencing enough fingerprint baptism can we subconsciously make appropriate and accurate judgments.

Although the number of fingerprints identified and analyzed by Lu Chuan in reality is not much, the experience rewarded in the system skills is not a lot at all.

Drag the fingerprint into the PS image processing interface, Lu Chuan enlarges the fingerprint, starts to pull the fingerprint from the most central place, zooms in step by step, and adjusts the width of the ridge line.

An important point here is to start zooming in from the center point of the fingerprint, although this is where the fingerprints are stacked most densely, and it is difficult to start.

But that's because there are too many fingerprint ridges, and the stacked vision causes a false feeling.

In fact, because the fingerprint stack is in the middle, the less space can be compressed, so the distance between the fingerprint crest in the middle is closer to the width of the suspect's real fingerprint than the outer edge.

The range of adjustment will also be small, so that from the inside to the outside, gradually stretched, you can get the most accurate approach to the real fingerprint.

But if you start from the periphery, although it feels much easier, but in fact, after cleaning a few ridge lines, you will find that because the fingerprint crest that has been cleaned on the periphery will not be automatically extended, then they will be stacked again on top of each other.

Therefore, it is necessary to re-clean the outer ridge line in turn.

To a certain extent, because it cannot be directly put in place at one time, it will also cause stacking, and then repeat the cleaning, and then stack again......

Reciprocating, a vicious circle.

And because every extension is done by the appraiser based on experience, even an expert-level fingerprint appraiser cannot guarantee that his experience is accurate every time.

If you come a few more times, there will naturally be deviations, and when you want to identify and analyze successfully, the difficulty will increase geometrically.

In the end, just like now, three or five years later, fingerprints still can't compare the suspects.

Of course, Lu Chuan stretches the crest line from the inside out, and can only stretch the middle

parts, the outer crest line does not automatically stretch outward.

But what Lu Chuan has to do is not to stretch the entire fingerprint, as long as a small part of the middle, even one-tenth of the size, is enough for identification.

Although such a small area may not be able to mark enough feature points to become judicial evidence, as long as there is a direction, there is still the scene of the criminal police.

As long as you can lock on to the target based on your fingerprint, the rest will continue to dig.

For example, in the case of Chen Xiaosong's murder, his stepfather was locked in fingerprints, and in fact, during the interrogation, it was found that his mother was also an accomplice.

Solving cases by the police is never a place to fight alone, nor is it a place for individual heroism.

Sincere cooperation and unity are the king's way.

At the same time, the criminal investigation detachment of the city of Tianzhou.

After receiving a call from Li Donglin of the Second Criminal Investigation Department of the Provincial Department, the head of the Wang Chuanmin detachment personally took command, and immediately organized an action group to prepare for the arrest operation.

"The other party is suspected to be the murderer of the serial murder case of a taxi driver twelve years ago!"

Before the action, Wang Chuanmin held a mobilization meeting in the conference room.

"According to the information we have in the past, the other side has extremely strong reconnaissance and counter-reconnaissance capabilities, and we must be cautious and cautious in the process of arrest."

"Everyone, body armor and guns are ready!"

"Let's go!"

No. 28 Minzhu Road, Shuntian Jinmao Building.

"The suspect is on the twenty-eighth floor, an executive of an economic and trade company, and we have just confirmed through the cleaning that the person is inside."

Zhao Ming, the leader of the action group, has confirmed the situation of the other party.

"Action!"

"Yes!"

Thirteen minutes later.

From the elevator, Zhao Ming and others escorted Xu Wenbing, who was wearing a hood, and walked out of the elevator.

The arrest process did not go well, and when Xu Wenbing saw the police suddenly break into the office, he put up a violent resistance.

This Xu Wenbing not only has a strong sense of reconnaissance and anti-reconnaissance, but also a master of fighting.

The four heavily armed criminal policemen who entered Xu Wenbing's office together were almost robbed of their firearms by the other party.

If it weren't for the critical moment, Zhao Ming hugged the opponent's lower back, forcibly resisted two elbow blows, and did not let go.

It may have irreversible consequences.

Now, Zhao Ming still felt like his back had been hit by a car, grinning in pain.

"Are you alright?"

Zhao Ming shook his head: "It's okay, it's just really painful, I don't know how this kid practiced, so fierce!"

"Fierce? Twenty years ago, this guy was the champion of free sanda in our city, and he ran a marathon for nearly ten years."

Zhao Ming shook his head, this person is really not easy to catch.

"By the way, captain, I heard that the fingerprint is Lu Chuan from the Haizhou Criminal Investigation Detachment?"

Lu Chuan's reputation in the Tianzhou City Criminal Investigation Detachment is still quite big.

Wang Chuanmin smiled: "What's more, he also won a case in Qianzhou City in the morning, and two murders in one morning!"

Although the other party was difficult, he was finally caught, and when the two were talking, the suspect was escorted into the car.

The trial commenced immediately.

At half past four in the afternoon, just as the operation of the Tianzhou City Criminal Investigation Detachment had just ended, in the fingerprint battle conference room, Lu Chuan stretched his waist.

After more than three hours, I finally got this fingerprint!