Chapter 1322

What kind of image enhancement method Jiang Yuan uses is actually only cared about by the two technicians from the provincial department, because they really know how to use it.

However, both of them are about the practical level, and the probability is LV1 level, which is enough to reach LV2.

However, when Jiang Yuan continuously changed the plan and finally output several different versions of the same fingerprint, the fingerprint experts at the scene all gathered around.

For the same fingerprint, the detailed parts of the fingerprint lines became clear and rich, and at the same time, the change in contrast also significantly improved the image quality.

This is a change that cannot be clearer. It is a change that can be fully utilized. As long as you have a little research on fingerprints, you know how much help this is for suspicious fingerprints.

Li Zemin enviously took away a whole pack of Zhonghua from Jiang Yuan's table, first took a fierce breath, then shook his head, and returned to his seat to get busy.

Other fingerprint experts looked at it, and they all dispersed.

"Eh, is it not smooth?" Zhang Limin, who was watching with a smile, was a bit anxious.

"Smooth." Li Zemin exhaled a faint smoke ring: "It's just boring."

Zhang Limin breathed a sigh of relief when he heard it, and laughed: "It's smooth. Fingerprint comparison is originally a bit boring."

"I am willing to be boring." Li Zemin hummed twice, saying: "We can't play this set of Director Jiang. The texture details he extracted are enough for the comparison of three-level features."

"Three-level feature comparison, how to say?" Zhang Limin was curious.

Li Zemin took a faint breath: "First-level features are texture features, arch patterns, loop patterns, and whorl patterns. Ordinary people can distinguish them at a glance. Second-level features are the feature points we usually use. Speaking of which, they are hooks, eyes, sticks, bridges, and points. Third-level features are the micro-details of fingerprints, including the edge morphology of papillary lines, line width, fine point count, and sweat pore features. This basically requires high-definition resolution to be used."

Li Zemin then pouted and said: "The clarity of the fingerprint Jiang Yuan extracted now is enough to reach it."

Zhang Limin suddenly realized, and then his face became positive and said: "I seem to have heard people from the department mention the promotion of this technology before. It should still be difficult? Is it a problem of high-definition resolution?"

Li Zemin nodded: "The advantage of three-level features is that you don't need such a large area of fingerprints. Even if it is an incomplete fingerprint, as long as the clarity is enough, even if there is only a very small area, it can be used for comparison. The problem is..."

Li Zemin smiled: "The fingerprints in our fingerprint database are not so high-definition. Therefore, it can only be used for secondary comparison."

"Secondary comparison is also fine." Zhang Limin understood instantly, and didn't say anything about promotion, only saying: "It is equivalent to saying that we found the suspect, and then use three-level features to compare, we can know whether it is the main master."

"Theoretically, it is like this." Li Zemin nodded slowly, hesitated, and said: "In academia, there is still controversy about this problem. Especially the extraction and matching of three-level fingerprints, the difficulty is relatively large. Ordinary technicians operate, and there are many cases of errors. Look at what Jiang Yuan did."

Zhang Limin suddenly realized: "You can't do it, so it's boring?"

He roasted cow eyes because he only cared about people who like to eat cow eyes, and he didn't care whether people who don't like to eat cow eyes are happy or not.

Li Zemin was laughed at by Zhang Limin: "I can extract and match three-level fingerprints. That image enhancement is another type of work. Except for people like Jiang Yuan, you ask who can do it."

Zhang Limin looked left and right, and sure enough, none of them raised their heads to perform.

"Don't look, you can't find a few such talents in the country." Li Zemin curled his lips and said: "Those who have this ability, those internet giants, Hollywood companies, game companies, are all scrambling to want, and the annual salary of one million is easy."

He said this, Zhang Limin understood, turned around and took out his mobile phone, and said: "Keep all the cow eyes in that slaughterhouse, and get some beef. Don't they slaughter cattle in the early morning? Just send it over while the beef is still jumping. Why is it called beef jumping? Don't you watch food videos? Just the kind of meat when the cow has just been slaughtered and the nerves are still jumping."

Zhang Limin was speaking loudly on purpose. When he put down his mobile phone, the experts in the room also heard it.

He couldn't take out an annual salary of one million, so he had to make up for it with cow eyes.

Jiang Yuan also finished brushing the fingerprints on the screen at this time, pressed print while turning his head and said: "Don't eat, I will do it for two more hours and have to go back to sleep. Branch Captain Liu, trouble you to send someone to take fingerprints for these people, wait for me to wake up and compare, just follow what Team Li said, take high-definition fingerprints, and have the level of comparing three-level fingerprints."

Liu Zhuangshi ran over immediately. The arrest mission this time was all from the Anwan City Bureau, and the City Bureau sent the work to the Anwan Criminal Police Detachment.

Zhang Limin waited on the side, unable to wait. He had been tossing for so long, and this was the sentence he wanted. He hurriedly said: "Is it matched? Is it a homicide case?"

For any fingerprint battle, matching a homicide fingerprint is not a failure.

Think about it, the fingerprints that can land on the fingerprint battle, unless it is a case that just happened, otherwise, it must be fingerprints screened from accumulated cases. What good fingerprints can it be?

Jiang Yuan handed the printed document to Zhang Limin, saying: "According to the incomplete fingerprints, I have ranked 8 people here. These 8 people have at least six or seven feature points that match. In addition, the three-level feature points mentioned by Team Li also partially match these 8 people. Wait for Branch Captain Liu to take high-definition fingerprints back, and then compare them again, and you can determine whether anyone is matched."

Jiang Yuan said, and specifically said to Liu Zhuangshi: "I collected the fingerprints on the victim's jacket. Judging from the position of the defensive wounds, it is not small that the fingerprints used for comparison are the murderer's, so pay attention to safety! On the other hand, it may also be fingerprints left by related people in advance. Therefore, among these 8 people, even if someone is matched, you must pay attention to the method when looking for people."

Zhang Limin immediately on the side, stretched out his palm, turned left and right, and said: "Pay attention to the scale, treat politely, bring a few more people, and be a little more vigilant."

"I understand." Liu Zhuangshi nodded immediately, saying: "One group of 4 people, 8 groups."

He looked at the ID numbers of several people on the printed paper, and they were from all over the world. Fortunately, the fingerprint battle had just started, and he was not short of people prepared under his hand.

Li Zemin specifically said: "The people sent must be able to take high-definition fingerprints. You have trained criminal police, or just bring a current survey or trace inspection person over. How high-definition do you want? 1000DPI or more scanning resolution?"

After the last sentence, Li Zemin asked Jiang Yuan. This is also the standard established by the National Institute of Standards and Technology in the United States in 2005.

Jiang Yuan said "um": "It is best to take it according to 1000. If you can't find anyone, you can only take fingerprints non-contact, at least 500."

"500 is also fine?"

"500 can identify the position of sweat pores on the grayscale map." Jiang Yuan said.

The two asked and answered, Liu Zhuangshi didn't understand much, but immediately made a decision: "I will assign a criminal science person to each group."