Jiang Yuan clicks the mouse from time to time to remove the fingerprints he has seen from the list. In this way, the fingerprints given by the software will not be repeated in the next wave of matching.
Despite this, the complexity of fingerprint matching remains unchanged.
Every time Jiang Yuan re-marks feature points, he has to re-read 150 fingerprints. On average, he looks at one fingerprint every 30 seconds, and it takes an hour to look at a group of fingerprints.
This is also caused by the complexity of fingerprints. If there are irrelevant fingerprints, you can turn the page at a glance, but the fingerprints matched by the computer are relatively similar, so it takes a little effort to exclude them.
However, the work of fingerprint matching is like this, especially for difficult fingerprints, where you are always wandering between "Are my feature points marked correctly?" and "Does this fingerprint exist in the fingerprint database?"
Jiang Yuan was no exception. When he fine-tuned his fingerprint for the fourth time, he couldn't help but stop.
"It should be a bigger one." Jiang Yuan came up with this idea unconsciously.
Originally, he made fine adjustments within a 20% range. However, as more and more fingerprints were excluded, by the third time of 150 fingerprints, the fingerprints matched by the system were already very exaggerated. Many fingerprints were matched by the human eye.
Looking at it, it seems that there is no connection at all - the fingerprints after two deformations cannot be expected to be sorted accurately by the system. Otherwise, Jiang Yuan would not have to rank 150 fingerprints.
But at this moment, Jiang Yuan was thinking of other colleagues.
They must also know how to fine-tune, and when it comes to patience, the policemen who do the fingerprint post are not weak. Reading fingerprints for a few hours is nothing. During the fingerprint battle, the participating police officers have to look at fingerprints for 15 to 20 days. It is amazing.
Experts can look at hundreds of thousands of fingerprints, and it is normal for them to look at thousands of fingerprints for a single case.
Jiang Yuan moved his fingers slightly and slowly retracted the suspect's fingerprint 30% toward the center.
This number is definitely an exaggeration. Normal deformation cannot be changed to this extent. However, considering the 150 candidate fingerprints, the probability of matching in the second half has been low to a certain extent. Jiang Yuan decided to choose a normal fingerprint expert.
The ratio will not be selected.
Of course, 30% was not drawn randomly. Jiang Yuan still made the edit with reference to the more stable area in the middle.
After quickly marking the new feature points, Jiang Yuan clicked OK again. After a short wait, he saw the candidate review list repopulated.
Still looking from top to bottom, as expected, the fingerprints ranked first are extremely similar.
Jiang Yuan quickly clicked "Exclude" and scrolled down. Because he had looked at the suspect's fingerprints too many times, he had firmly memorized the suspect's fingerprints in his mind. He could make a judgment just by looking at the matching fingerprints on the right side.
If it is said that proving the comparison requires multiple considerations, proving the exclusion is relatively simple. As long as there are obvious similarities and differences, it can be eliminated.
This time, Jiang Yuan only took twenty minutes to get his 90th fingerprint.
When he clicked the right button out of habit, Jiang Yuan paused.
The 91st fingerprint, the upper middle part, gave Jiang Yuan a sense of deja vu.
Jiang Yuan sat up a little straighter and checked more carefully.
The difference between two fingerprints can be very large or very small. In fingerprint identification, to identify them as identical, first there must be 8 or more feature points that are the same, and secondly, there must be no similarities or differences, or
, the similarities and differences can be explained.
As far as Jiang Yuan's current fingerprints are concerned, it is very difficult to achieve the two standards for identifying the same, but if you include the fingerprint correction part, there are eight - it was finally achieved.
Jiang Yuan quickly uploaded the completed pictures, wrote the identification instructions that they were identical, clicked OK, and then breathed a sigh of relief.
It actually hit the mark.
Moreover, among a set of 91 bit ratios of candidate fingerprints, this low-probability success actually brought a great sense of accomplishment.
Jiang Yuan leaned back on the chair, picked up the cup, and drank a full cup of water. He felt as good as if he had drank a whole bottle of cold beer in three days. His forehead was still cramping, and he was completely overusing his brain.
status.
"Are there any results?" Wu Jun looked over from across the office, looking at Jiang Yuan's appearance and making some guesses.
Jiang Yuan smiled proudly, and then said modestly: "I just uploaded it, and I still have to wait for experts to verify it."
"Then there's a pretty good chance." Wu Jun was really surprised. He calmed down and looked at Jiang Yuan again, and said: "Actually, this case is our county's own. If you win, report it directly to Captain Huang.
That’s it, no need to go through expert verification.”
"Check it, I'm reassured. The fingerprints are severely deformed." Jiang Yuan paused and said with a smile, "I'm not in a hurry for this day."
"That's true." Wu Jun said with emotion: "If you win this time, it will be equivalent to directly solving a long-standing case with serious harm."
Jiang Yuan smiled obediently.
Although the quality of the intentional injury case cannot be compared with that of the murder case, it is also one of the eight serious cases in the criminal law. Coupled with the backlog of cases, any policeman who cracks such a case will have to be a member of the criminal police team for at least a few months.
The most handsome boy.
Wu Jun himself is just an ordinary forensic doctor. Relying on his rich experience and the only label in the county, he has also had his shining moments. But looking at Jiang Yuan at this time, he can't help but feel envious - if he could do it when he was young
With this level of skills, how can he grow so tall and marry a wife who doesn’t scold or hit anyone, doesn’t require a salary card, cooks well and is willing to clean?
"Go home." Wu Jun looked at the time and stood up half-heartedly.
It was already 6:30 in the evening, and the normal off-duty time had passed, but on the floor of the Criminal Division Squadron, the policemen in various offices were still working silently.
The two people who came out of the medical examiner's office looked at each other and quietly locked the door.
"Without the body, we have no choice but to get off work. We have to go back and do laundry today." Forensic Doctor Wu walked lightly and spoke softly.
Jiang Yuan nodded and said, "I'll go back and have a meal."
"Shh." Wu Jun pulled Jiang Yuan down the stairs, and then chatted in a relaxed mood: "What's the banquet?"
"Uncle Seventeen's table." Jiang Yuan looked back at Wu Jun and invited, "Do you want to go?"
"What am I going to do...it's your seventeenth uncle..."
"You cut it."
"That's right..." 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."
"go?"
Wu Jun shook his head helplessly, took out his pocket and said, "Help me join him, just a pack...half a pack of cigarettes. I'll light them for him."
Jiang Yuan took away the half-pack of Yuxi given by Wu Jun, waved his hand, went to the parking spot, and rode his electric scooter home.
