Whirring hot air blew out from the chassis and dispersed in the air.
After a while, the 20 fingerprints with the highest matching values were displayed on the right side of the LCD screen.
Jiang Yuan was not in a hurry, took a sip of tea, and then clicked on the first fingerprint to read it.
In the past two days, the criminal police team, which was operating at full capacity due to Uncle Seventeen's murder case, suddenly relaxed, and Jiang Yuan returned to his daily routine as a forensic doctor - without any work.
At the same time, he gradually became proficient in the use of the system reward he had just received, the "Chongqing-style single-finger fingerprint analysis method - bow pattern identification (lv3)".
After doing some exercises using exercise books from his school days and public information, Jiang Yuan decided to enter into practice: first find a bow pattern, and then find out who it belongs to.
As a first step, Jiang Yuan chose fingerprints collected from a robbery case in Longli County, a neighboring city.
The reason why we did not choose fingerprints from murder cases is because under the guidance of "murder cases must be solved", murder cases receive great attention and there are a lot of resources. Before becoming a backlog, the fingerprints have been compared many times and are still retained in the fingerprint database.
It must be extremely difficult to find fingerprints in the backlog of murder cases.
If there is an unsolved murder case in Longli County, and the suspect's fingerprints are extracted, the fingerprints will first be compared by the trace inspection personnel of Longli County many times. If the comparison fails, they will have to go to the police multiple times.
If all attempts are unsuccessful, we will definitely ask the municipal criminal science and technology squadron for help, or directly contact the provincial department.
If the fingerprint still fails to match at the provincial and department level and the case remains unsolved, then every one or two years or so, the provincial department and even ministries will organize special fingerprint battles to analyze the fingerprints involved in major backlog cases.
In comparison, its participants are often experts from the criminal technical talent pool or youth talent pool of provincial departments or ministries.
Jiang Yuan has already eaten LV3 level egg fried rice, so his expectations for the LV3 level bow pattern identification are not that strong.
The egg fried rice is delicious, but it doesn't shine.
It can be deduced from this that LV3's bow pattern identification is very powerful, but it is not amazing.
Not to mention, the fingerprint database that he can compare with is now limited. Jiang Yuan feels that it is too easy to be frustrated if he challenges the murder case with the first fingerprint.
In contrast, the robbery is more suitable for the present.
On the one hand, ordinary robbery cases cannot reach the level of major provincial cases. On the other hand, robbery cases are taken seriously enough by the county bureau. This determines that when the fingerprint inspection police were doing fingerprint extraction, they must also be
Serious enough. The fingerprints finally uploaded to the database are highly relevant to the case.
Having said that, Jiang Yuan was quite surprised when he clicked on the fingerprint image of the case for the first time.
The fingerprints were extracted under unknown circumstances. Not to mention they were blurry and incomplete, only about half of the normal fingerprints. Fortunately, more of the fingertips were preserved, so there was a basis for comparison.
In addition, it goes without saying that fingerprints are deformed.
This situation is completely different from the fingerprints left behind by ordinary people punching in to work. Without any professional skills, let alone marking feature points, it is difficult to determine which finger it belongs to.
Unsurprisingly, all of the 20 fingerprints automatically matched by the system failed to match.
Jiang Yuan is not discouraged. This kind of fingerprint is uploaded to the system because it is difficult to match the local fingerprint inspection. As for the failure to match the local fingerprint, it may be a technical problem, or it may be that the corresponding fingerprint is not collected in the fingerprint database.
.
If it's the latter, then Jiang Yuan has no choice but to hope that the bureau's fingerprint database will be wider... and what he is fighting for now is the former.
For fingerprint inspection police officers who do fingerprint matching, hard work is a must. Only by hard work can you have a chance to fight for luck.
Jiang Yuan closed the fingerprint comparison page and reopened the suspect's fingerprint image, this time using Photoshop.
He carefully observed the state of the incomplete fingerprint, and then began to adjust the contrast and brightness.
Jiang Yuan made extremely detailed adjustments, so much so that it took half an hour to slightly improve the clarity of the fingerprint image.
However, sharpening the knife never wastes time chopping firewood. After Jiang Yuan waited for everything to be prepared, when he looked at the fingerprint pattern carefully, the direction of the lines became clearer.
Immediately afterwards, Jiang Yuan slightly adjusted the center point of the fingerprint.
Because the fingerprint is so incomplete, the center point itself is uncertain. If Jiang Yuan does not make adjustments, the system will automatically estimate a center point.
Jiang Yuan watched the direction of the lines, repositioned the center point, then put it back into the software, changed the conditions, and pressed OK again.
Another 20 fingerprints failed to match.
Then fine-tune the center point and compare again...
This time, Jiang Yuan spotted the third-ranked fingerprint at a glance.
When ordinary people look at fingerprints, they probably think they are similar at first glance. Especially if they are both bow-shaped or bucket-shaped, it is often difficult to distinguish them.
But for people who have been looking at fingerprints, different fingerprint features are like the freckles on an old sow’s face, and they feel familiar after looking at them for a long time.
Jiang Yuan directly clicked on the third fingerprint, enlarged it and placed it on the right side of the computer screen, then opened the original fingerprint and placed it on the left side of the screen.
When the two fingerprints are put together, the similarities are immediately apparent.
At this time, we don’t just look at the feature points, but directly look at the similarity of the fingerprints. In one-on-one situations, the human eye’s resolution ability is much better than that of a computer.
"We won the match!" Jiang Yuan murmured to himself, feeling relaxed for a while, and then submitted the matching fingerprints.
According to the rules, the fingerprints he submitted will be submitted to the experts from the provincial department. After the latter reviews and confirms that they are correct, and then clicks submit, someone will notify the corresponding front-line unit, and the local area will arrange the arrest.
Of course, if the local criminal police team wants to arrest someone, there is no problem.
Jiang Yuan couldn't care so much anymore. He stretched, stood up and stretched his muscles. He looked at the time again and waited peacefully for get off work to come off work.
The forensic life without corpses is simple and pure.
