National Forensic Doctor

The office has returned to calm, just like a study room. Occasionally, someone shows off their affection, which seems to attract everyone's attention, but after the incident disappears, everyone will basically forget about it.

The work in front of everyone is the most important thing at this time.

Jiang Yuan also returned to his seat and continued to screen for fingerprints that fit him.

He deliberately looked for fingerprints that were vague and in poor condition for comparison.

Because compared to ordinary fingerprint inspection, he can also use "image enhancement technology (lv3)" to process fingerprint images.

In fact, the current automatic fingerprint recognition system also needs to process images. Operations such as thinning and denoising, ridge segmentation, and ridge extraction are all automatically completed in the computer background, so trace inspectors do not need to worry too much.

But with the current level of technology, it is impossible for an automated automatic fingerprint identification system to match the manual level of an expert.

Jiang Yuan directly pulled out a surveillance posture and took a fingerprint image. In just a moment, he selected a blurry picture that looked like the bottom of a pot.

Jiang Yuan's computer host became agitated because of this.

Ouch, ouch, ouch...

The host computer Jiang Yuan is using now has pretty good configuration. It is a new computer purchased centrally by the provincial department. But after it was assigned to the trace inspection position, it has hardly made any efforts to exercise the graphics card and CPU in more than two years.

At Jiang Yuan's request, its fan started spinning crazily, and the sound it made seemed like it was shouting: Why am I so hot? I am really scared.

Jiang Yuan stood up, waved the Zhonghua in his hand to Li Zemin next to him, and invited him: "Go outside for a smoke?"

Li Zemin also felt that Jiang Yuan's machine was noisy, and wanted to smoke more, so he immediately followed Jiang Yuan's footsteps.

The two of them left the office, gave each other a cigarette, and started puffing away.

Jiang Yuan only smoked a cigarette, holding it with his hand most of the time, and then looked ahead blankly.

Li Zemin didn't care so much. After smoking one, he sighed with satisfaction, took another one, and asked, "Why is your computer so noisy?"

Jiang Yuandao: "I'm doing image processing. Will it be too noisy?"

Li Zemin knew a little better and couldn't help but look at Jiang Yuan and said: "The fingerprint processing is so loud, then your skills are quite powerful."

"Well, I will do image enhancement like surveillance video and try it on fingerprint images. I don't know if it will have any effect."

"If it works, let someone give you a separate place, or find a separate place to process the images." Li Zemin said with emotion: "You young people are amazing, unlike us, who were exhausted when learning fingerprints... …By the way, how far can your technology achieve the image?”

"It's hard to explain. What's vague will become clearer, but it's targeted." Jiang Yuan didn't explain it too clearly, because he himself hadn't really experienced it.

In general, image enhancement technology, when used on fingerprints, is still a bit overkill.

Whether it was suitable or not, he himself couldn't tell.

However, one thing is clear. During the fingerprint battle, the dozens of fingerprint experts present were actually in a competitive relationship.

When encountering a fingerprint, the first thing everyone thinks of is whether it has been seen by other fingerprint experts. Why was it not compared? What's the reason for not being able to win?

If the reason for failing to compare is a matching problem, then it will be useless no matter how good your feature points are.

If the incompleteness of the fingerprint is too high, then others will not be able to match it, and it is very likely that you will not be able to match it either.

Because of this, some fingerprint experts have proposed that the strategy in fingerprint battles is "don't do it if it's clear, don't do it if it's too vague, and don't try again if it's not too light."

It sounds very simple, and it seems like a self-referential strategy, but if you think about it carefully, it is actually a very valuable strategy.

In this case, there is actually no value in doing anything if fingerprints are too clear. The same goes for fingerprints that are too blurry.

Only fingerprints that are neither light nor heavy are the focus of many fingerprint experts' work. However, when you think about so many fingerprint experts focusing on these fingerprints that are neither light nor heavy, the focus becomes difficult.

Jiang Yuan's ability to process blurry images makes him unique.

Back in the office, Jiang Yuan's computer had stopped roaring and the fan was spinning feebly. He was like a special trader who had just received a group of people. He was breathing hard just to prove that he could still breathe. At the same time, because of what he had just done The fruits of his work make him proud.

Jiang Yuan looked at the fingerprint image on the screen, and there were already many more gaps that were enough to identify.

Jiang Yuan nodded with satisfaction. The image was not afraid of being blurry, but it was afraid that it would not have pixels and would have to be filled in. In the criminal department images, it would be difficult to tell the truth from the false.

The bottom-of-paste image is simple. Just process the pixels that can be processed by the process, and the rest can be used.

Jiang Yuan tried his best to choose more accurate image parts as supports, then made feature points, and then ran the software.

The first time, 100 fingerprints, no match.

The second time, Jiang Yuan re-selected the characteristic points and swiped 200 more fingerprints. When he saw the 47th one, he found a similar fingerprint.

The reason why they are similar rather than identical is because both fingerprints have been processed and there are not many matching points.

But this situation is the most common among difficult fingerprints.

It's the same reason. If the characteristic points can be easily matched, why send it to the provincial department and enter the fingerprint battle?

Here, the computer’s automated judgment takes a back seat.

The core competitiveness of fingerprint experts is always human judgment.

The current automatic fingerprint recognition system is ultimately a numerical system. It does not make image judgments, but makes numerical judgments by assigning values ​​to images.

To put it bluntly, the automatic fingerprint recognition system recognizes endpoints and bifurcation points. It is effective in distinguishing most feature points, but some traditional feature points, such as small dots, small hooks, small crosses, and small bridges , small eyes, dotted lines, etc., the automatic recognition system is incapable of distinguishing them.

In addition, things such as the flow direction of the lines or the pattern of the lines are not very clear, let alone the automatic fingerprint recognition system.

In an environment like a fingerprint battle, Jiang Yuan did not need to worry about the computer's characteristic points. He made annotations according to the traditional Qingdao-style single-finger fingerprint analysis method, then right-clicked and selected "identify the same".

Ding dong.

In the office, notifications of new messages rang out again.

Li Zemin next to him subconsciously looked at Jiang Yuan next to him, and saw Jiang Yuan slowly opening a box of new Zhonghua.