civil forensic

Chapter 1337 Seeing the real person

Chapter 1337 Seeing the real person

Three poles in the sun.

Inside the Anwan Fingerprint Battle Operations Room (smoking room), the air conditioner was blasting like it was on COPD.

Wei Shikan sat in the chair, sweating profusely, staring blankly at the screen. On the draft paper in front of him were scribbled equations and some annotations like HE and WT, but they were all in pieces.

Li Zemin pretended to be passing by, glanced at Wei Shikan's expression, and then revealed a strangely pleased expression on his face.

If watching Jiang Yuan work is like sitting in a volcano watching lava, then Wei Shikan is like a block of ice the size of a Muggle. Getting close to him is refreshing, and placing him indoors is cooling; he is always a comfortable presence.

"Uncle-Master, I have a question for you." Wei Shikan suddenly looked up and called out to Li Zemin.

Li Zemin's smile vanished in an instant, replaced by caution: "I have a mountain of cases here... What do you want to ask?"

He just couldn't match the fingerprints, but he understood that Wei Shikan was a second-generation policeman.

These people either ask questions to cause trouble or they genuinely have a problem, and Li Zemin doesn't want to answer any of them.

Sure enough, Wei Shikan didn't pause at all, and spewed out mathematics like a spider demon: "In a model containing multiple convolutional layers, each pixel of a hyperspectral image contains information from multiple bands, so the size of the input layer is H×W×BH... The activation function is ReLU (rectified linear unit)..."

Snapped.

Li Zemin lit a cigarette and lit a lighter: "This is indeed a question worth pondering. Think about it carefully first, and if you still don't understand, come back to me, or I can introduce you to a professor..."

Then, Li Zemin left quickly with a normal expression.

……

When Jiang Yuan woke up and returned to the conference room, it was already afternoon.

On the wall of the conference room, the eight teams dispatched to various locations had almost all arrived at their destinations and were gradually reporting the newly scanned fingerprints.

Suspects living in big cities were found fastest if they had direct flights; those from cities with high-speed rail access were the next fastest. The worst-case scenario was someone returning to the countryside, forcing the team of detectives to rent cars and speed around, fearing that they would call the suspect's cell phone before they even arrived.

Jiang Yuan wasn't in a hurry. After each team found a suspect, they would take the suspect to the nearby police station for "protection." They wouldn't go into the interrogation room, but would just sit in the consultation room with tea and water.

Of the eight people, five had prior criminal records and were naturally well-behaved. The others were also quite sensible; after being persuaded by four out-of-town criminal police officers and several local police officers, they all obediently followed along.

To be fair, at least seven of these eight people are innocent; the only difference is that their fingerprints resemble those of the criminals. Therefore, the detectives who traveled a long distance to get the fingerprints were very restrained and spent the time chatting with the suspects after taking their fingerprints.

Jiang Yuan's temporary +1 skill is still on cooldown, but there's no need to use it.

LV6 fingerprint analysis technology is not that difficult to use for one-on-one verification.

The only thing to be aware of is that fingerprint extraction has higher requirements, but this is not difficult, because the fingerprint owner is sitting in the consultation room of each police station. If Jiang Yuan feels that the fingerprint is not clear, it is very convenient to take it again.

Li Zemin put down his work again and stood behind Jiang Yuan to eat melon seeds.

Zhu Huanguang particularly disdained Li Zemin's attitude; a perfectly good fingerprint expert shouldn't be doing his own work, but just watching others do fingerprints...

Despite his thoughts, Zhu Huanguang couldn't help but raise his head, his gaze passing over his own screen and landing on Jiang Yuan's screen.

There were several screens in front of Jiang Yuan, and no one was restricted from watching them. They were covered with dense black and white fingerprint lines.

The two largest screens simultaneously display high-definition details of a fingerprint sensor.

The three-level fingerprint feature has been in use for over 20 years, and those working on fingerprint technology are eagerly anticipating its widespread adoption in China.

However, popularizing a new technology is an extremely difficult task.

Just like the concept of fingerprints has been around for over a hundred years, it's only in the last 20 years that criminals have been forced to wear gloves.

Correspondingly, the tertiary features of fingerprints are incredibly tempting to fingerprint experts, as it means that even a small, incomplete fingerprint could potentially lead to a match with a criminal suspect.

The requirement of 8 feature points is difficult for secondary fingerprint features. However, for tertiary features, the shape of just a few sweat pores might be enough to confirm a match.

However, promoting this technology is tantamount to rebuilding the entire fingerprint system. Just as fingerprint collection requires high resolution, fingerprint extraction also needs to be high resolution. At the very least, the current fingerprint collection methods need to be updated, and equipping each on-site investigation team with a high-resolution spectral imager is a basic requirement...

Of course, the most difficult thing is always dealing with people.

If the difficulty of annotating the secondary features of fingerprints is LV2, then the difficulty of annotating the tertiary features of fingerprints is LV4.

While new technologies are certainly useful, the probability of errors is also very high. In the criminal investigation industry, the cost of making mistakes is often extremely high, especially in countries like China or Japan, where the conviction rate remains at 9% or even higher for a long time. While the power is immense, the difficulty of bearing no responsibility also increases simultaneously.

"Number One is not."

Jiang Yuan habitually numbered the eight people, and after arriving at a definitive answer, he immediately had Wang Chuanxing call the other side.

After all, with several criminal police officers accompanying them on the conversation, the psychological pressure on the suspect and his family was immense.

"Number 2 isn't it either..."

"Number three is not..."

Jiang Yuan was quick to compare, examining three of the first six fingerprints delivered in one go.

When they started watching the fourth one, Li Zemin suddenly began to quietly cheer them on from behind.

"Beat! Beat! Beat!"

Li Zemin swung his arms slightly, his eyes filled with the excitement of a stock market investor watching the market.

"Number four is not it."

Jiang Yuan responded extremely quickly.

Li Zemin sighed regretfully.

Jiang Yuan glanced back at him with amusement, then opened the fifth fingerprint and said, "The fingerprints have already been confirmed, so what difference does it make whether you shout or not?"

“Unless you’ve seen it, these are Schrödinger’s fingerprints. Even this person himself hasn’t seen the tertiary characteristics of his own fingerprints.” Li Zemin said, handing a Zhonghua cigarette to Jiang Yuan, his body already beginning to sway forward.

Jiang Yuan chuckled, turned around and zoomed in on the fingerprint details, adjusting and observing them as he went.

Another problem with the three-level fingerprint features is that they are so high-resolution and tiny that you can't even determine which area of ​​the finger a fingerprint belongs to.

This doesn't resemble the secondary features of a fingerprint, which at most have a hundred or so feature points that can be easily identified by comparison.

Of course, this kind of difficulty only affects lower-level technicians, just like some leaders, and has no impact on experts like Jiang Yuan.

"Number five isn't it either."

Jiang Yuan gave a negative answer again.

"Only number six is ​​left. Numbers seven and eight are located in more remote areas, and neither group has arrived yet." Liu Zhuangshi was clenching his fists, almost sweating.

Jiang Yuan nodded.

Li Zemin, standing next to him, laughed and said, "To say something politically incorrect, the probability is higher if you live in a remote area. It's okay, if you don't win on the 6th, the probability is higher on the 7th or 8th..."

"I got it."

Jiang Yuan interrupted Li Zemin, did only one check, and then said to Wang Chuanxing, "Call Group 6, be careful, be cautious, and don't let the suspect hear you!"

Li Zemin, holding a cigarette, stared blankly: "So fast? Shouldn't we take a closer look?"

"We'll see the real person after they're handcuffed," Jiang Yuan replied more directly.