National Forensic Doctor

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 the late night stay yesterday be in vain?"

"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 that he brought with him. He cheered up a little and said, "Although I only read some superficial things yesterday, if I just understand the cutting-edge technology, I should It’s enough.”

Dr. Ye clicked his tongue twice: "You are working too hard."

"What about you? You're still young, so 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 bad work 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. It's useless to stay up all night."

"Just take it one day at a time. I will do my best." Forensic Doctor Zhai relaxed his tone and turned to the young forensic doctors who had come for training.

He said: "You have more opportunities. When you have free time recently, you will read the relevant information. Even if Jiangyuan is 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 beautifully and let these young forensic doctors have unreasonable illusions and then face failure.

"clear.

"We must study hard." "How long has Captain Jiang been studying?"

Several forensic doctors were in good moods. This is the most common situation that occurs during training. When faced with 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 hard to take the whole body to the office upstairs. Occasionally, I would pick up a skull, grab it from my waist and walk away, and the policemen I saw on the road would not 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 with high performance. Director Huang just sent it from the county. The origin was unknown.

of.

Also installed 3DSler, put it on the table, opened it, and laid out the half-made skull. Jiang Yuan said again: "It happens that the computer upstairs is 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 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 seeking the Tao, and he has a feeling of hearing the Tao.

However, hearing the Tao does not mean attaining enlightenment.

Jiang Yuan doesn’t hide his secrets anyway

, expanded the software and said: "No. 2 was done more slowly, but it also achieved local deformation. This part itself may need to be more detailed, because the final effect is largely determined by local deformation. Let's continue first. Let’s take a look at it first to get a basic feel. If you want to start 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, it can be roughly seen depending on the degree.

And trying to perfectly reproduce the deceased's appearance 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 original skull model 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 does not pursue understanding, but mainly pays attention to 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. It was a bit difficult, but it was just starting now. Everyone was still holding their breath and trying to digest it.

Seeing this, Jiang Yuan continued.

He mainly had to do the case, or in other words, really restore the two skulls, so he took care of the other people a little and started working as usual.

Jiang Yuan pulled 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 the radial basis function interpolation method. Commonly used radial basis functions include Gaussian function, Hardy quadratic function, and 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, and required more skills in art and sculpture. If computer assistance is used, prerequisite skills such as sculpture are no longer necessary. What will be replaced are mathematics and computer requirements.

Times are changing, and so are the polynomials, coefficients, and equations on the screen.

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.

not at all. 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.

Dr. Ye looked at Jiang Yuan with clear eyes and a smile. If you don’t understand, you just don’t understand. He, King Ye Li, has a clear conscience.

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