The last method of fingerprinting is called exact matching.

That is, on the target fingerprint, select at least 13 or more feature points, and then match the fingerprint in the database exactly.

Only when all the selected feature points are successfully matched, it means that the fingerprint identification is successful.

The system will give a special beep to indicate that the match is successful.

This kind of fingerprint identification and analysis method is not used by ordinary people.

Unless you encounter a very simple fingerprint matching, that is, the kind of fingerprint collected is very clear, without any deformation, and can be compared with the rubbing fingerprint with the naked eye.

There is also a kind of technical master, who is very confident in fingerprint preprocessing, and the feature point marking and calculation are very clear.

Lu...... Which one?

The comparison of feature points is not a simple image processing, just look at the image.

When marking each feature point, the angle and length should be calculated according to the different points, and the data should be recorded on the horizontal coordinate axis.

In this way, the system will make comparisons based on these data.

Liu Guodong was also surprised.

Just now, they were mainly observing Lu Chuan's fingerprint pre-processing behind them, and they didn't notice that the fingerprint match he clicked on was an exact match.

The difficulty of this is not half a star compared to the fool mode and the probabilistic analysis mode.

The current investigation and trace inspection of the Haizhou Criminal Investigation Detachment...... Going to roll over?

Lu Chuan's attention was on comparing the dossiers of successful objects.

"It's the porter of the exhibition hall," Lu Chuan looked at Liu Guodong with some excitement: "Master, give me some more time." ”

"These fingerprints, in about half a day, I can compare them, and the investigation on the side of the action team will have a direction."

Why fingerprint analysis is so important in solving crimes.

It's not just about providing clues when there's no clue, and when there's a suspect, locking up the suspect.

There is also the need to provide investigative confidence for the investigation of the action group.

Especially during questioning and interrogation, with this evidence in hand, the other party said that he was not panicked, and the difficulty of judgment was reduced a lot.

Just like the ancient Oiran, everyone wants it, and the key depends on whether there is enough silver in their pockets.

The silver is enough, and then talk about the wind and snow, poetry and songs.

4:28 p.m.

A pile of fingerprint identification analysis reports was sent to Qin Yong's office.

"Team Qin," Liu Guodong's expression was extremely excited, and he was going to show his face again this time: "The fingerprints on the frame, oil painting, and skin have all been identified!" ”

Lu Chuan collected a total of 79 fingerprints, of which 78 were all successfully compared.

This provides an excellent direction for the next reconnaissance work.

"Good, good!"

Qin Yong slapped his thighs continuously.

It seems that what he holds in his hand is not a few reports, but a mountain of gold and silver.

"The survey did a good job this time!"

"It's all Lu Chuan, from yesterday to now, he has been busy collecting and analyzing fingerprints, and he hasn't closed his eyes for almost forty-eight hours."

Liu Guodong sighed with emotion, the most commendable thing about being a criminal police officer is the strength to fight.

When you encounter a task, dare to fight.

There is also a spirit of dedication.

This time, the on-site investigation and trace inspection work are continuous, on the one hand, Liu Guodong's own strength is insufficient, and on the other hand, Liu Guodong wants to test Lu Chuan.

As a result, the result is clearly very satisfying.

From now on, Lu Chuan is completely able to take charge on his own.

Liu Guodong can also let go of a lot of work to him.

Qin Yong nodded appreciatively, although he didn't close his eyes much for two days and one night.

"I'm going back and giving you two days off in the field haha!"

After speaking, Qin Yong walked out of the office with the report: "The task force, all the responsible persons, the meeting in Conference Room No. 1 will be held in ten minutes!" ”

The meeting ended quickly.

It is mainly based on the fingerprint comparison results of Lu Chuan's identification and analysis, and the division of labor is investigated.

Theoretically, all the owners of the fingerprints that appear on the paintings could be the murderers.

Of course, the owner of the fingerprint on the frame is less likely to be the murderer.

The fingerprints on the screen may have been left by visitors.

After all, there is no protection for the painting, and anyone can touch it.

The most suspicious is actually the owner of the three fingerprints taken by Lu Chuan on his skin.

The skin is sealed with resin to form a painting, so who else can touch the skin except the murderer?

"Arrest Liang Song immediately!"

That's right, the owner of the fingerprints on the skin, one of them is the grassroots painter Liang Song.

An hour later.

"Who are you talking about?"

"Dead people...... Is it Zhang Zixuan? ”

Liang Song's expression was full of horror.

Ren Qiang and Zhang Hui glanced at each other, and Zhang Hui spoke: "Liang Song, tell me, how did you kill Zhang Zixuan, why did you kill her, and where was the first crime scene!" ”

"You ...... Suspect I killed her? ”

Liang Song struggled and writhed, the shackles on his hands rattled.

"I didn't kill her!"

"I really didn't kill her!"

"How could I have killed Zixuan...... Woowoo"

Faced with the news of Zhang Zixuan's death, Liang Song was very emotional, and the sadness that flashed on his face was easy to capture.

After hysteria, he actually started crying.

It took a long time for Liang Song's mood to stabilize.

"Do you smoke?"

Liang Song nodded solemnly, Zhang Hui got up, and lit a cigarette for Liang Song.

The strong smell of tobacco made Liang Song's expression relax slightly.

"I really didn't kill her, I couldn't kill her, I love her so much, how could I kill her?"

"Liang Song, now that Zhang Zixuan has been killed, the human skin has been hidden in the oil painting, and this oil painting was found in your studio."

"And," Ren Qiang took out a report: "This is a fingerprint identification analysis report, and we found your fingerprints on that human skin." ”

"These ...... How do you explain that? ”

In the interrogation room, Liang Song's psyche was on the verge of collapse.

"I ...... I do not know...... But I really didn't kill her. ”

Liang Song seems to have lost the ability to answer questions normally.

Ren Qiang exhaled, this was exactly the situation he needed.

Liang Song will not lie in this case.

"Then you first tell me how you and Zhang Zixuan met, when was the last time you saw her, and where was it."

Zixuan...... We met ...... a year ago."

With Liang Song's memories, the relationship between the two gradually became clear.

Zhang Zixuan, after graduating from university, entered Haizhou Vocational and Technical College to work.

I usually like to paint, and by chance, I met Liang Song.

A year ago, I began to learn to paint in Liang Song's studio.

"Zixuan comes to my studio every Wednesday, because it is a weekday, there are very few students in the studio, most of the time there are only two of us."

Although Liang Song is a grassroots painter, he has not studied painting systematically.

But he's got a lot of talent, and he's got a bit of an artist.

Unlike most raunchy artists, Liang Song's long gray hair in his shawl is exquisitely groomed.

He has deep eyes and is very focused when he is painting.

This is a high-quality uncle with a mood, an artistic atmosphere, talent and money.

"We are in love, really, we are in love."

Liang Song's expression became relaxed in the memory: "But...... We were found out by Zixuan's boyfriend......"