civil forensic

Chapter 125 Cap
Graphic investigation is a criminal science major with a very high upper limit and a very low lower limit.

On the upper limit, just image denoising technology, there are countless noise and clear image models, and it is still increasing.

Different noise models and clear image models, coupled with different solving methods, form a variety of denoising algorithms.There are hundreds of them in number.

For example, the well-known BM3D noise reduction, DCT noise reduction, PCA noise reduction, K-SVD noise reduction, non-local mean noise reduction, WNNM noise reduction, etc...

But writing algorithms and making models are not the upper limit of image detection.In order to substantively process the images and images faced by image scouting, it is necessary to master various algorithm models, have considerable experience in processes and methods, and have a considerable grasp of related technologies.

Of course, such an upper limit requirement may not necessarily be met in the whole country, not to mention the province.

In places like Ningtai County, in most cases, the video office and the like exist only to meet the minimum requirements - to find surveillance video and keep an eye on people.

It's okay to miss it occasionally.

Zhuang Wei and others originally worked only to meet the minimum requirements.Now, Jiang Yuan has shown them the existence of a quasi-upper limit.

And it must be very painful to jump over this gap.

You can see it, but you can't touch it, which is really uncomfortable.

Jiang Yuan took out another set of videos, looked at the three-generation image man next to him, thought for a while, and said simply: "Different graphics and images require different methods. As far as the current technology is concerned, it is impossible to have a A general-purpose algorithm that is compatible with all graphics. Of course, you can try it with several commonly used modules, but the effect will definitely not be very good.”

With that said, Jiang Yuan took out a completely different wavelet transform from before, and filled in the parameters.

The core of image enhancement is the algorithm. Using different software is actually choosing a different algorithm.

For users, after selecting an algorithm, the most important task is to fill in the parameters.And it is a large number of parameters.

The video recordings of the cases are different, and the required targets are also different processing procedures. These are problems that need to be solved easily by humans, but difficult to solve by programs.

It's as if the video Jiang Yuan is seeing now is a surveillance video of a distant view backlit.The two people who are the targets appear in the lower left corner of the video, so they are slightly distorted.

And these are places that the algorithm is not easy to take into account, so Jiang Yuan is required to fill in the parameters and delineate the range and interval.

This process occasionally requires other programs to help judge, or it is left to the user to make empirical judgments.

Jiang Yuan turned on and off multiple software, filled in a lot of numbers, and then started the program again.

During this process, the three-generation image man saw clearly, and gradually became desperate.

"You didn't seem to fill in so many things last time." Zhuang Wei, a generation of video male, asked Jiang Yuan politely.

Jiang Yuan said "En" and said: "The video conditions this time are a bit worse. In addition, the algorithm used is different, and some software requires more parameters to be filled in."

Last time, Jiang Yuan operated on the computer in the imaging office, and their software had fewer algorithms to choose from and fewer parameters to fill in.The software installed on Jiang Yuan's own computer is naturally more suitable for him.

It is also more complicated.

Zhuang Wei and the other three looked at each other, not knowing what to say.

Wei Zhenguo didn't care so much, he sat next to him, smoked two cigarettes with Wu Jun in peace of mind, and then heard the creaking sound of the printer.

"I'll get it." Wei Zhenguo jumped up, ran to grab the four pictures of the second video, and moved quickly like a young habitual thief.

Jiang Yuan took four frames of pictures this time and processed them together.

This is also one of the reasons for the large number of parameters. Video processing is more complicated, and it is easier to produce things with more pictures.

After laying a few pictures on the table and looking at them for a while, Wei Zhenguo could only shake his head, took a photo, and said, "I'll show it to my colleagues. Maybe it's a newcomer now."

Wei Zhenguo found two groups and posted the photos.

Jiang Yuan packed up his things, and handed over the copying U disk and other things to Zhuang Wei.

As soon as the roar of the computer mainframe stopped, a call came from Wei Zhenguo's cell phone.

"Where did you find the picture?" The phone was connected, and there was a questioning voice on the other end.

Wei Zhenguo smiled and said, "That can't be said, the case is still under investigation. Did you recognize the person inside? Do you know the name?"

The other end of the phone hesitated for a few seconds, and said: "I look like it, but I'm not sure if it is, you go to the library to search for Zhang Wanjie. See if it is."

"The case in your hand?"

"Before, it was included in the hunt and escape."

"Ha, then let me take a look, thank you, I'll treat you to a cigarette later." Wei Zhenguo hung up the phone as he spoke.

Without him saying anything, Jiang Yuan opened the "National Fugitive Information System" on the computer that had just finished roaring, and entered the words "Zhang Wanjie".

"Robbery, snatching, burglary, theft... Jiangyang is no doubt a thief." Wei Zhenguo raised the corners of his mouth as he spoke, his mood was like a temporary inspection in a KTV, and suddenly found that one of the beauties was a man and a fugitive Same……

"A B-level arrest warrant for the location." Zhuang Wei sighed: "This is a B-level warrant."

There are two levels of arrest warrants issued by the ministries and commissions. Level A is the list made by the ministries and commissions themselves, and they are the key fugitives that the ministries and commissions consider. Class B is the list made by the ministries and commissions in response to the requirements of the various provinces and departments, rewards and docking, etc., which are also handed over to the provinces and departments.

However, for the grassroots police, it is very rare to catch a Class B fugitive.

For the TuCun, looking for fugitives is actually a routine job.For example, in Changyang City's Picture Investigation Brigade, there are policemen looking for fugitives all year round, and their work content is like searching databases for fingerprints.

As far as the current domestic monitoring resources are concerned, anyone has the ability to become the protagonist of the video, it just depends on who can discern the pearl.

Of course, this matter must not be easy, especially for those who are on the wanted list of the ministries and commissions, they cannot be found by the county bureau or the city bureau, and then reported to the provincial department, and then to the ministries and commissions.

Among them, there may not be people trying desperately at every step, but various comparisons are also indispensable.

Catching a fugitive easily is equivalent to obtaining third-class merit easily.In essence, there is still a bit of Versailles.

Wei Zhenguo was one step away from the fugitive, but he gritted his teeth and said, "It only counts if you catch it. If you have clues, it's a waste."

"Do you want to follow the monitoring?" Zhuang Wei actively participated.

Wei Zhenguo couldn't help looking at Jiang Yuan.

"It's easier for them to find than for me." Jiang Yuan said very practically.His main ability is focused on image enhancement. As for what it is like to follow the surveillance, he is not clear.

Wei Zhenguo then smiled at Zhuang Wei: "Then it would be the best if we can find a place for this guy."

He didn't know how Ben Guo knew Zhang Wanjie, but since he was on the fugitive list, he was probably very vigilant.It is very likely that they will not tell Ben Guo his whereabouts.

Zhuang Wei warmly invited Wei Zhenguo back to his office.

In a place like Ningtai County, I haven’t met a fugitive chaser for several years. He is also very active—although it is also possible that it is Zhuang Wei and others. They were not able to find out the fugitive before, but they just followed the surveillance. , Zhuang Wei is still enough.

Wei Zhenguo entered the imaging office while making a phone call.

Ben Guo must strengthen the interrogation here, and he even has certain expectations for Ben Guo.

Such a stupid thief, you said he picked up fugitives at the bus station for friendship?Wei Zhenguo didn't believe it at all.

Judging from the improvement of Ben Guo's life, the development of artistic sentiment, and the fact that stealing has become a daily hobby, Ben Guo must have a new way of making money, and he is still stupid.

Wei Zhenguo hopes that through Ben Guo, more things can be brought out.

"Let's take a look, let's look for it along the road to the bus station." Zhuang Wei found more surveillance videos from the cloud, and watched them bit by bit.

Wei Zhenguo followed along and helped analyze the route from time to time.

Looking at it, Zhuang Wei clicked his tongue twice, and said: "Jiang Yuan seems to be very lucky, he has been able to catch up with such a big case."

Wei Zhenguo stared at the screen, and smiled unconsciously: "Perhaps the technology he uses is much higher than normal."

Zhuang Wei was stunned. After thinking about it carefully, this is really the truth.

As for the video at the bus station, if it was handed over to them, it must have been thrown into the water, and the so-called chasing and fleeing is naturally out of the question.

According to Zhuang Wei's understanding of the map investigation, unless it is directly handed over to the map investigation brigade of the provincial department, otherwise, the level of the Qinghe City Bureau will be the same.But without solid evidence, how could the video be handed over to the Provincial Department of Graphic Investigation Team.

Zhang Wanjie may not know the details of the police system, but his long-term escape experience can roughly tell him where the boundary of safety is.

Jiang Yuan just broke through this layer of boundary, so he was easily pulled out.

Zhuang Wei figured it out, and his sense of loss doubled.

It is actually a very high requirement to clearly surpass your peers and the average level of the industry.

Having figured this out, Zhuang Wei's tense muscles relaxed again.

Love someone.

tired.

(End of this chapter)