wavenovel Chapter 1336 Level 3 Characteristics
Chapter 1336 Level 3 Characteristics
Chapter 1336 Level 3 Characteristics
Only two technicians from the provincial department cared about the specific image enhancement methods Jiang Yuan used, because they actually knew how to use them.
However, both of them are probably at a practical level, most likely LV1, and unlikely to reach LV2.
However, when Jiang Yuan changed his schemes repeatedly and finally produced several different versions of the same fingerprint, the fingerprint experts present gathered around.
With the same fingerprint, the details of the fingerprint ridges become clearer and richer, and the change in contrast also significantly improves the image quality.
This is a change that couldn't be clearer, a change that can be directly utilized. Anyone with even a little knowledge of fingerprints knows how helpful this is for solving difficult fingerprint problems.
Li Zemin enviously took a whole pack of Zhonghua cigarettes from Jiang Yuan's table, took a deep drag, shook his head, and went back to his seat to continue his work.
The other fingerprint experts looked around and then dispersed.
"Huh, is it not going well?" Zhang Limin, who was watching with a smile, was getting a little anxious.
"Smoothly," Li Zemin said, exhaling a faint smudge of smoke from his eyes. "It was just boring."
Zhang Limin breathed a sigh of relief upon hearing this and smiled, "As long as it goes smoothly. Fingerprint matching is a bit tedious anyway."
“I’d rather be bored,” Li Zemin snorted twice and said, “We can’t play this game with Director Jiang. The details of his lines are enough for a comparison of third-level features.”
"What do you mean by 'three-level feature comparison'?" Zhang Limin asked curiously.
Li Zemin took a light sip of his throat: "The primary features are the ridge features, such as arched, whorl, and loop patterns, which are easily distinguishable by the average person at a glance. The secondary features are the feature points we commonly use, namely hooks, eyes, bars, bridges, and dots. The tertiary features are the microscopic details of the fingerprint, including the shape of the papillary ridge edges, the width of the ridges, the number of fine dots, and the features of the sweat pores. These can basically only be used under the premise of high-definition resolution."
Li Zemin then gestured with his lips and said, "The clarity of the fingerprint Jiang Yuan has extracted is sufficient."
Zhang Limin suddenly realized, then his expression turned serious and he said, "I think I heard someone from the ministry mention promoting this technology before. It must be difficult, right? Is it because of the high-definition resolution?"
Li Zemin nodded: "The advantage of level three fingerprint features is that it doesn't require such a large area of fingerprint. Even a fragmented fingerprint, as long as it's clear enough, can be used for comparison, even if it's only a small area. The problem is..."
Li Zemin smiled and said, "The fingerprints in our fingerprint database aren't that high-resolution. So, they can only be used for secondary comparisons."
“A second comparison will work too.” Zhang Limin understood instantly and stopped talking about promotion. He simply said, “It’s like, once we find a suspect, we can use the third-level characteristics to compare and find out if it’s the real person.”
“That’s how it is in theory.” Li Zemin nodded slowly, then hesitated for a moment before saying, “Academically speaking, there’s still some debate on this issue. Especially the extraction and matching of level 3 fingerprints, which are quite difficult. Ordinary technicians often make mistakes when performing this. You can see this from what Jiang Yuan did.”
Zhang Limin suddenly realized: "You can't do it, so it's meaningless?"
He grills cow eyes because he only cares about people who like to eat them; he doesn't care whether people who don't like them are happy or not.
Li Zemin was amused by Zhang Limin: "I can do level 3 fingerprint extraction and matching, but image enhancement is a different job. Apart from someone like Jiang Yuan, who else can do it?"
Zhang Limin looked around and, sure enough, not a single person looked up or showed any reaction.
“No need to look, there aren’t many talents like this in China.” Li Zemin curled his lips and said, “Those with this ability are sought after by major internet companies, Hollywood companies, and game companies. A million-dollar annual salary is easy for them.”
Upon hearing this, Zhang Limin understood. He turned around, pulled out his phone, and blurted out, "Keep the cow's eyes from that slaughterhouse for me, and get some beef too. Don't they slaughter cows in the early morning? Bring it over while the beef is still twitching. What do you mean by 'beef still twitching'? Don't you guys watch food videos? It's the kind of meat where the cow has just been slaughtered and the nerves are still twitching."
Zhang Limin was speaking loudly on purpose, and by the time he put down his phone, all the experts in the room had heard him.
He couldn't afford an annual salary of one million, so he had to make up for it with cow's eyes.
Jiang Yuan finished swiping his fingerprint on the screen, pressed the print button, and turned around to say, "I'm not eating anymore. I'll work for another two hours and then go back to sleep. Chief Liu, could you please send someone to collect these people's fingerprints? I'll compare them after I wake up. Just like Captain Li said, we need to collect high-definition fingerprints that can be compared to level three fingerprints."
Liu Zhuangshi rushed over. This arrest mission was originally assigned to the Anwan Municipal Public Security Bureau, which then subcontracted it to the Anwan Municipal Criminal Investigation Detachment.
Zhang Limin, who was waiting impatiently, asked hastily, "Did you win the contest? Did you win the murder case?" He had been waiting for this answer all this time.
For any fingerprinting operation, matching a murder fingerprint is not considered a failure.
It's obvious that fingerprints that can be logged into the fingerprint battle are either from cases that just happened, or they must be fingerprints that have been filtered through rounds of backlog cases. What good fingerprints could they be?
Jiang Yuan handed the newly printed document to Zhang Limin and said, "Based on the incomplete fingerprints, I've identified eight people. These eight people all have at least six or seven matching feature points. In addition, some of the third-level feature points that Captain Li mentioned also match. Once Liu Zhi returns with the high-resolution fingerprints, we can compare them again to determine if anyone has been identified."
Jiang Yuan had said that he would then specifically tell Liu Zhuangshi, "I collected the fingerprints from the deceased's coat. Judging from the location of the defensive wound, there is a good chance that the fingerprints used for comparison belong to the murderer, so be careful! On the other hand, it is also possible that the fingerprints were left in advance by someone connected to the case. Therefore, even if any of these eight people are matched, you need to be careful about the methods you use when you are looking for them."
Zhang Limin immediately stood by, stretched out his palm, and flipped it left and right, saying, "Be mindful of boundaries, treat them politely, bring a few more people, and be more vigilant."
“I understand.” Liu Zhuangshi nodded immediately and said, “Four people per group, eight groups in total.”
He looked at the ID numbers of several people on the printed paper. They came from all over the country. Fortunately, the fingerprinting campaign had just begun, and he had enough people under his command.
Li Zemin specifically said, "Among the people you send, they need to be able to take high-resolution fingerprints. Do you have any trained criminal police officers for this, or could you bring a forensic investigator or trace evidence specialist? How high-resolution do you need? A scanning resolution of 1000 DPI or higher?"
The next sentence, Li Zemin asked Jiang Yuan, refers to a standard established by the National Institute of Standards and Technology (NIST) in the United States in 05.
Jiang Yuan hummed in agreement: "It's best to take fingerprints at 1000. If we can't find anyone and can only take fingerprints non-contactly, the minimum is 500."
"500 is okay?"
“500 can identify the location of sweat pores on a grayscale image,” Jiang Yuan said.
The two exchanged questions and answers, and Liu Zhuangshi didn't quite understand, but he immediately made a decision: "I will assign a criminal investigator to each group."