Chapter 13: Eating the Feast

"Exclude."

"Exclude..."

Jiang Yuan clicked the mouse from time to time to remove the viewed fingerprints from the list. In this way, the next time the software matches, the fingerprints given will not be repeated.

Despite this, the complexity of fingerprint matching has not changed.

Every time Jiang Yuan re-marks the feature points, he has to look at 150 fingerprints. On average, it takes 30 seconds to look at one, and it takes an hour to look at a group.

This is also caused by the complexity of fingerprints. If it is an irrelevant fingerprint, you can turn the page at a glance, but the fingerprints matched by the computer have relatively high similarity, and you have to spend some effort to exclude them.

However, the work of fingerprint matching is like this, especially for suspicious fingerprints, always hovering between "did I mark the feature points correctly" and "is there this fingerprint in the fingerprint database".

Jiang Yuan is no exception. When he adjusted the fingerprint for the fourth time, he couldn't help but stop.

"Should adjust a big one." Jiang Yuan couldn't help but pop up this idea.

Originally, he was fine-tuning within the range of 20%, but as more and more fingerprints were excluded, by the third 150 fingerprints, the fingerprints matched by the system were already very exaggerated. Many fingerprints looked completely unrelated to the human eye—after two deformations, you can't expect the system to be very accurate in sorting. Otherwise, Jiang Yuan wouldn't have to rank to 150 fingerprints.

But at this time, Jiang Yuan thought of other peers.

They must know how to fine-tune, and in terms of patience, the police officers in the fingerprint post are not weak. What is it to look at fingerprints for a few hours? During the fingerprint battle, the participating police officers have to look at fingerprints for 15 to 20 days. Powerful experts can look at more than 100,000, and it is normal to look at thousands of fingerprints for one case.

Jiang Yuan's fingers moved slightly, slowly shrinking the suspect's fingerprint to the center by 30%.

This number is definitely exaggerated. Normal deformation cannot reach this level, but considering the 150 candidate fingerprints, the probability of matching in the latter part has dropped to a certain level. Jiang Yuan decided to choose a ratio that ordinary fingerprint experts would not choose.

Of course, 30% is not drawn casually. Jiang Yuan still referred to the more stable area in the middle to make the editing.

After quickly marking the new feature points, Jiang Yuan clicked OK again, waited a little, and saw the refreshed candidate inspection list.

Still looking from top to bottom, as expected, the similarity of the fingerprints ranked in front is extremely insufficient.

Jiang Yuan clicked "Exclude" and brushed down quickly. Because he has seen it many times, the suspect's fingerprint has been firmly remembered in his mind. Just look at the fingerprints matched on the right to make a judgment.

If it is said that proving a match requires multiple considerations, proving exclusion is relatively simple. As long as there are obvious similarities and differences, you can click exclude.

This time, Jiang Yuan only spent twenty minutes to brush to the 91st fingerprint.

When he habitually clicked the right button, Jiang Yuan paused.

The 91st fingerprint, the upper middle part, gave Jiang Yuan a sense of familiarity.

Jiang Yuan sat up a little straighter and checked it more carefully.

The degree of difference between two fingerprints can be large or small. Falling into fingerprint identification, to identify the same, first there must be 8 or more feature points the same, and secondly, there must be no differences, or the differences can be explained.

As far as the fingerprints Jiang Yuan is doing now, the two standards for identifying the same are very difficult to achieve, but if you count the correction part of the fingerprint, it is finally realized to gather eight.

Jiang Yuan skillfully uploaded the made picture, wrote the identification explanation of identifying the same, clicked OK, and then breathed a long sigh of relief.

It actually matched.

And it was matched in the 91st place of a group of candidate fingerprints. This low-probability success brought a great sense of accomplishment.

Jiang Yuan leaned against the back of the chair, picked up the cup, drank a full cup of water, and felt refreshed in his heart, like drinking a whole bottle of iced beer in the third nine days, and his forehead was still cramping, which was a state of excessive brain use.

"Any results?" Wu Jun looked over from the opposite side of the office, looking at Jiang Yuan's appearance, and guessed.

Jiang Yuan smiled proudly and said modestly: "Just uploaded, waiting for expert verification."

"Then there is a not small probability." Wu Jun was really quite surprised, calmed down and looked at Jiang Yuan again, and said: "Actually, this case is our county's own. You matched the person, just report it to Team Huang directly, no need to go through expert verification."

"Verify it, be more at ease, the fingerprint deformation is relatively serious." Jiang Yuan paused and smiled: "It's not in a hurry for this day."

"That's true." Wu Jun said with emotion: "You matched this time, which is equivalent to directly solving a cold case of serious injury."

Jiang Yuan smiled obediently.

The quality of intentional injury cases certainly cannot be compared with homicide cases, but it is also one of the eight major heavy cases in the Criminal Law. Plus the cold case component, any police officer who solves such a case must be the most beautiful boy in the criminal police team for a few months.

Wu Jun himself is just an ordinary forensic doctor, relying on rich experience and the label of the only one in the county, he also had a highlight moment, but looking at Jiang Yuan at this time, he couldn't help but feel envious—if he could have this level of technology when he was young, he could marry a wife who doesn't scold, doesn't hit, doesn't want a salary card, cooks well, and is willing to clean up?

"Go home." Wu Jun looked at the time and got up with interest.

It was already 6:30 in the evening, and the normal off-duty time had passed, but the police officers in the offices on the floor of the Criminal Science Squadron were still working silently.

The two people who came out of the forensic office looked at each other and locked the door lightly.

"No corpse, just get off work. I have to go back to wash clothes today." Wu Wu Fa Yi Wu stepped lightly and spoke in a low voice.

Jiang Yuan nodded and said: "I'm going back to eat the feast."

"Shh." Wu Jun pulled Jiang Yuan down the stairs, and then chatted with a relaxed mood: "What feast to eat?"

"Seventeenth uncle's feast." Jiang Yuan looked back at Wu Jun and invited: "Do you want to go?"

"Why should I go... it's your seventeenth uncle..."

"You cut it."

"That's also..." Wu Jun was speechless, and said after a while: "I have been a forensic doctor for half my life, and this is the first time I have been invited by a client."

"Are you going?"

Wu Jun shook his head helplessly, took out his pocket and said: "Help me follow the gift, just follow a pack... half a pack of cigarettes. Just light it for him."

Jiang Yuan collected the half pack of Yuxi given by Wu Jun, waved his hand, went to the parking point, and rode his electric scooter home.