The last method of fingerprint identification is called exact match.
That is to select at least thirteen feature points on the target fingerprint, and then completely match them with the fingerprints in the database.
Only when all the selected feature points are successfully matched will the fingerprint identification be successful.
The system will give a special beep prompt when the match is successful.
This method of fingerprint identification and analysis is not something most people would use.
Unless you encounter a very simple fingerprint match, that is, the collected fingerprint is very clear without any deformation, and can be visually compared with the rubbing fingerprint.
There is also a technology master who is very confident in fingerprint pre-processing and has very clear marking and calculation of feature points.
Lu Chuan...which kind is it?
The comparison of feature points is not simple image processing, it just looks like it.
When marking each feature point, the angle and length must be calculated based on the different points, and the data must 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 doing fingerprint preprocessing from behind, and did not notice that the fingerprint matching he clicked was a perfect match.
The difficulty of this is not even a little bit stronger than the fool mode and probability analysis mode.
The Haizhou Criminal Investigation Detachment’s current trace inspection...is about to turn over?
Lu Chuan's attention was on comparing the archives of successful targets.
"He's the porter of the exhibition hall," Lu Chuan looked at Liu Guodong excitedly: "Master, give me some more time."
"I can compare these fingerprints in about half a day, and the action team's investigation will have a direction."
Why fingerprint identification analysis is so important in solving crimes.
Not only provide clues when there are no clues, but also identify suspects when there are suspects.
There is also the need to provide investigative confidence for the action team’s investigation.
Especially during questioning and interrogation, with this evidence in hand, the difficulty of judgment will be reduced a lot if the other party is not panicking.
Just like the oiran in ancient times, everyone wants it, but the key depends on whether you have enough money in your pocket.
If you have enough money, let’s talk about romance, poetry and songs.
4:28 p.m.
A stack of fingerprint identification and analysis reports was sent to Qin Yong's office.
"Team Qin," Liu Guodong's expression was extremely excited. This time he was about to show his face during the on-site survey: "The picture frame, the oil painting and the fingerprints on the skin have all been identified!"
Lu Chuan collected a total of seventy-nine fingerprints, and seventy-eight of them were successfully compared.
This provides an excellent direction for the subsequent investigation work.
"Okay, okay!"
Qin Yong slapped his thigh continuously.
It seems that what he is holding in his hand is not just a few reports, but a mountain of gold and silver.
“The survey was done well this time!”
"It's all Lu Chuan. From yesterday to now, he has been busy collecting and analyzing fingerprints. He hasn't slept for almost forty-eight hours."
Liu Guodong felt a little emotional. The most valuable thing about being a criminal police officer is his fighting spirit.
When you encounter a mission, dare to fight and take on it.
While you have skills, you must also have dedication.
This time, the on-site survey and trace inspection work continued. On the one hand, it was Liu Guodong's own lack of strength. On the other hand, Liu Guodong wanted to test Lu Chuan.
The results, obviously, are very satisfying.
From now on, Lu Chuan is completely able to take charge of his own business.
Liu Guodong can also leave many tasks to him.
Qin Yong nodded appreciatively. Even though he had spent two days and one night, he didn't sleep much.
"I'll give you two days off later, haha!"
After finishing speaking, Qin Yong walked out of the office with the report: "The task force, all responsible persons, will meet in conference room No. 1 in ten minutes!"
This meeting will end soon.
Mainly based on the fingerprint comparison results of Lu Chuan's identification and analysis, the division of labor investigation was carried out.
Theoretically, any owner of a fingerprint that appears on the painting could be the murderer.
Of course, the owner of the fingerprint on the frame is less likely to be the murderer.
The owner of the fingerprints on the screen may have been left by a visitor.
After all, the paintings have no protection and can be touched by anyone.
The most suspicious person is actually the owner of the three fingerprints extracted from Lu Chuan's skin.
The skin is sealed with resin to form a painting, so besides the murderer, who else can come into contact with the skin?
“Arrest Liang Song immediately!”
That's right, one of the owners of the fingerprints on the skin is the grassroots painter Liang Song.
after an hour.
"Who are you talking about?"
"The person who died...is Zhang Zixuan?"
Liang Song's expression was full of horror.
Ren Qiang and Zhang Hui looked at each other, and Zhang Hui said: "Liang Song, tell me, how did you kill Zhang Zixuan, why did you kill her, and where was the first crime scene!"
"You...doubt that I killed her?"
Liang Song struggled and twisted, and the shackles on his hands rattled.
"I didn't kill her!"
"I really didn't kill her!"
"How could I kill Zixuan...wuwuwu"
Facing the news of Zhang Zixuan's death, Liang Song was very emotional, and the sadness flashing across his face was easily captured.
After becoming hysterical, I actually started crying.
It took a long while before Liang Song's mood stabilized.
"Smoking?"
Liang Song nodded numbly, Zhang Hui stood 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, and I couldn't possibly kill her. I love her so much, how could I kill her?"
"Liang Song, now Zhang Zixuan has been killed, and 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. We found your fingerprints on that human skin."
"How do you explain these...?"
In the interrogation room, Liang Song's psychology was on the verge of collapse.
"I...I don't know...but I really didn't kill her."
Liang Song seemed to have lost the ability to answer questions normally.
Ren Qiang let out a breath, this was exactly what he needed.
Liang Song would not lie in this situation.
"Then tell me first how you and Zhang Zixuan met, when and where you last saw her."
"Zixuan...we met a year ago..."
As Liang Song recalled, the relationship between the two gradually became clear.
Zhang Zixuan entered Haizhou Vocational and Technical College to work after graduating from university.
I usually like painting, and by chance, I met Liang Song.
A year ago, I started learning painting in Liang Song’s studio.
"Zixuan comes to my studio every Wednesday. Because it is a working day, there are very few students in the studio. Most of the time there are only two of us."
Although Liang Song was a grassroots painter, he had not conducted systematic painting studies.
But his talent is very good, and he has a bit of an artist's air.
Unlike most artists who are unkempt, Liang Song's long, gray hair is carefully taken care of.
With deep eyes, he is very focused when painting.
This is a high-quality uncle who is sentimental, artistic, talented and wealthy.
"We are in love, really, we are in love."
Liang Song's expression relaxed at the memory: "But... Zixuan's boyfriend discovered our affair..."
