The basement of the Longli County Criminal Police Brigade.
Forensic Doctor Ye looked at Forensic Doctor Zhai's red eyes and was a little scared. When he was taking out a basket of bones, he said kindly: "Zhai Chu, do you want to take a rest? You can do your work at any time.
You don’t have to work so hard.”
"Rest..." Forensic Doctor Zhai tilted his head, and repeated what Forensic Ye said sluggishly, like a broken repeater. After a while, he said: "If you rest..., wouldn't yesterday be in vain?
Stayed up late?"
"There was no need for you to stay up late yesterday." Doctor Ye couldn't laugh or cry, and thought to himself, what can you do if you are cheated of 10 yuan for breakfast now.
Forensic Doctor Zhai struggled for a while, then took another sip of strong wolfberry tea from the thermos cup he brought with him, and cheered up a little, saying: "Although I only read some superficial things yesterday, if I just understand the cutting-edge technology, I should
It’s enough.”
Forensic Ye clicked his tongue twice: "You are working too hard."
"What about you? You are still young and you don't want to give it a try?" Forensic Doctor Zhai kindly gave some advice to Forensic Doctor Ye.
Forensic Ye laughed: "I'm 46 years old, I can work hard for a few more years."
Forensic doctor Zhai looked at him coldly: "You can fight for 10 more years than me."
Forensic Doctor Ye was stunned for a moment. He had been doing this for many years. Most leaders either didn't understand forensic techniques or were a few years older than him. There were really very few people who would grind their crotches with their heels like this.
Fortunately, he had been idle for long enough and said casually: "I'm too far away from the frontier, and it's useless to stay up all night."
"Just take it one day at a time. I'll do my best." Forensic Doctor Zhai relaxed his tone, then turned to the young forensic doctors who came for training and said, "You have more opportunities. When I have time recently, I will read the relevant information.
, Even though Jiangyuan is just in Shannan Province, it will not be easy if you leave the province and want to see such cutting-edge technology."
The young forensic doctors nodded one after another, everyone understood the truth.
"It's good to learn as much as you can and get a better understanding of it." Forensic Doctor Zhai tried his best to speak conservatively, lest he speak too wonderfully and let these young forensic doctors have false dreams and then face failure.
"clear."
"We must study hard."
"How long has Captain Jiang been studying?"
The mood of several forensic doctors is good. This is the most common situation during training. When facing a brand-new and very advanced thing, everyone's interest and enthusiasm are very high.
On the one hand, people themselves like new things, on the other hand, new technologies have broad prospects, and it would be great if you are included in the prospects.
While talking, Jiang Yuan also came over.
It's still not easy to take the whole body to the office upstairs. Occasionally, I would pick up a skull, pick it up at the waist and leave, and the policemen I saw on the road wouldn't say anything.
But if you carry two baskets of corpses up at once, it feels a bit weird, and it's not very convenient to spread them out. You might as well put them all in the basement room - the funeral parlor is too far away, and no one is too lazy to go there.
Therefore, compared with wet corpses, dry corpses are more popular among forensic doctors.
"Shall we start directly?" Jiang Yuan brought a laptop, a high-performance one, which Director Huang had just sent from the county, and the source was unknown.
Also installed 3DSlicer, put it on the table, opened it, and laid out the half-made skull. Jiang Yuan said again: "The computer upstairs happens to be running the male skull No. 1. Let's do No. 2 here first. Then, you guys are
Are you looking at the bones, or are you going to do cranial reconstruction with me?"
Everyone expressed their desire to undergo skull reconstruction.
Forensic Doctor Zhai smiled calmly and said: "I reviewed it all night yesterday, just to understand it better when I read it."
Doctor Ye said: "I can do it."
"Forensic doctor Zhai is very determined." Jiang Yuan praised him. At such an old age, he can still maintain his pursuit of technology. This is like a sage who is dedicated to pursuing the Tao, and he feels like he is going to learn the Tao.
However, hearing the Tao does not mean understanding the Tao.
Jiang Yuan didn't hide his secrets anyway, so he opened the software and said: "No. 2 did it more slowly, but it also achieved partial deformation. This part itself may need to be more detailed, because the final effect is largely a partial deformation.
It’s decided. Let’s move on. Let’s take a look at it first to get a basic feel. If you want to look at it from the beginning later, just look for other cases.”
There are several key steps in skull restoration, from three-dimensional modeling, to calibration of feature points, to overall deformation and local deformation. In this series of processes, three-dimensional modeling is to create an identical skull and feature points on the computer.
The calibration is equivalent to attaching soft tissue to the skull, and the overall deformation is the adjustment of the position and proportion of the organs, that is, where the nose is, how high the brow bone is, and what the shape of the mouth is.
Up to this point, it can be understood as an unchangeable physiological characteristic of a person.
Local deformation determines the specific shape and details of the facial features, such as the size of the nose, the thickness of the mouth, etc. This step is actually equivalent to what a plastic surgeon can do.
Theoretically, if a corpse has undergone plastic surgery before death, some of it can be roughly seen depending on the degree.
However, trying to perfectly reproduce the appearance of the deceased during the process of partial deformation is as complicated as guessing what he (she) transformed himself into. There are a lot of details to pay attention to.
"There are some key data to pay attention to here. For example, the distance between the eyebrow point of the skull model to be restored and the outer corner of the eye socket, the distance between the outer corners of the two eyes, etc..." Jiang Yuan said as he began to fill in some
data.
Forensic Doctor Zhai nodded slightly. After all, he had a basic foundation, including skull restoration. What he mainly lacked were those prerequisite skills. His knowledge of forensic anthropology was still very smooth.
Lao Ye also nodded. He didn't pursue understanding, but mainly focused on an atmosphere.
The young forensic doctors who followed nodded solemnly. Jiang Yuan's sentence contained not only the knowledge of forensic anthropology, but also required knowledge of mathematics and computers. The difficulty is a bit difficult, but we are just starting now.
Everyone still held their breath and stared, trying hard to digest it.
Jiang Yuan saw the situation and continued talking.
He mainly had to do the case, or in other words, really restore the two skulls, so he took care of the others a little and started working as usual.
Jiang Yuan pulled up the screen and said: "As we all know, there are two main methods to achieve local deformation of the reference face model: one is the scattered data interpolation method, and the other is the free deformation technology FFD. I am going to use the first method now.
Method, using radial basis function interpolation method, commonly used radial basis functions include Gaussian function, Hardy quadratic function, thin slice spline with linear additional terms..."
As Jiang Yuan spoke, he began to assign values to these functions.
In the past, purely manual skull restoration did not need to consider these functions and other issues. What was needed was more skills in art and sculpture. If it is replaced by computer assistance, pre-requisite skills such as sculpture are not necessary.
were replaced by mathematics and computer requirements.
Times are changing, and the polynomials, coefficients, and equations on the screen are also changing.
Partial deformation makes the person completely unrecognizable.
Jiang Yuan typed on the keyboard for a while, then stood up and said: "Run around and take a look. In essence, the radial basis function network is a three-layer forward feedback network..."
As he spoke, he looked at Forensic Doctor Zhai, Forensic Doctor Ye and other young forensic doctors.
Forensic doctor Zhai is older and will definitely not understand these things, but young forensic doctors are all college students who have recently graduated. Although, under normal circumstances, they still can't understand these things, I don't know if they are mathematical geniuses...
No. Everyone's eyes subconsciously looked at other parts of the corpse. Although forensic anthropology always makes people feel unfriendly, it depends on who they are compared to.
Jiang Yuan looked at Dr. Ye again.
Forensic doctor Ye looked at Jiang Yuan with clear eyes and a smile. If you don't understand, you just don't understand. He, Ye Liewang, has a clear conscience.
