Chapter 124 Upper Limit

Image detection is a criminal science specialty with a very high upper limit and a very low lower limit.

As for the upper limit, there are already countless noise and clear image models for image denoising alone, and the number is still increasing.

Different noise models and clear image models, coupled with different solution methods, have formed a variety of denoising algorithms. There are hundreds of them.

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

Writing algorithms and making models are not the upper limit of image detection. To substantially process the images and images faced by image detection, 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 upper limit requirements may not be met, not to mention within the province, even across the country.

In places like Ningtai County, in most cases, the existence of image offices is just to meet the lowest limit requirements of finding surveillance videos and keeping an eye on people.

It doesn’t matter if you can’t keep an eye on them occasionally.

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

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

It is really uncomfortable to see but not touch.

Jiang Yuan took out another set of videos, looked at the third-generation image man next to him, thought about it, and simply said: "Different graphics and images require different methods. As far as current technology is concerned, it is impossible to have a universal 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 too good."

As he said, Jiang Yuan took out a wavelet transform that was completely different from the previous one and filled in the parameters.

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

For users, after choosing the algorithm, the most important task is to fill in the parameters. And a lot of parameters.

The video recordings of the cases are different, and the required targets are also different processing processes. These are problems that are easy to solve manually but difficult to solve by programs.

Just like the video Jiang Yuan is seeing now, it is a surveillance video with backlight in the distance. The two people who were the target appeared in the lower left corner of the video, so they were slightly deformed.

These were places that the algorithm could not easily take into account, so Jiang Yuan had to fill in the parameters and define the range and interval.

This process occasionally required other programs to help judge, or the user to make an empirical judgment.

Jiang Yuan turned on and off multiple software, filled in a large number of numbers, and then ran the program again.

This process was clearly seen by the third-generation imaging man, and he gradually became desperate.

"You didn't seem to fill in so many things last time." Zhuang Wei, the first-generation imaging man, asked Jiang Yuan politely.

Jiang Yuan said "yes", "The video conditions this time are a little worse. In addition, the algorithms used are not quite the same. Some software requires more parameters to be filled in."

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

It was also more complicated.

Zhuang Wei and the other three looked at each other, and they didn't know what to say.

Wei Zhenguo didn't care about that, so he just sat next to him and smoked two cigarettes with Wu Jun peacefully, then heard the printer creaking.

"I'll take it." Wei Zhenguo jumped up and ran to grab the four pictures of the second video, his movements were as fast as 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 more pictures.

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

Wei Zhenguo found two groups and sent the photos out.

Jiang Yuan packed up his things and handed the USB flash drive and other items used for copying to Zhuang Wei.

As soon as the roar of the computer host stopped, Wei Zhenguo's mobile phone called.

"Where did you find the pictures?" When the call was connected, there was a question from the other end.

Wei Zhenguo smiled and said, "I can't say that. The case is still under investigation. Did you recognize the person inside? Do you know his name?"

The other end of the phone hesitated for a few seconds and said, "I think he looks like him, but I'm not sure. Go to the library and search for Zhang Wanjie. See if he is."

"The case in your hand?"

"It's from the past. He's on the wanted list."

"Ha, then I'll take a look. Thank you. I'll treat you to a cigarette later." Wei Zhenguo said and hung up the phone.

Jiang Yuan didn't need him to say anything. He opened the "National Fugitive Information System" on the computer that just stopped roaring and entered the words "Zhang Wanjie".

"Robbery, snatching, burglary, theft... He is undoubtedly a big thief." Wei Zhenguo said with his mouth curled up. He felt like he was doing a temporary inspection in a KTV and suddenly found that one of the beauties was a man and a fugitive...

"A Class B wanted order for the part." Zhuang Wei sighed, "We just caught a Class B."

Ministry's wanted orders are divided into two levels. Level A is the list drawn up by the ministry itself, which is the key fugitives that the ministry considers. Level B is the list drawn up by the ministry in response to the requirements of the provincial departments. The rewards and connections are also handed over to the provincial departments.

However, for grassroots police officers, catching a Level B fugitive is already a very rare thing.

For image detection, finding fugitives is actually a routine job. For example, the image detection brigade in Changyang City has police officers looking for fugitives all year round, and their work content is like playing with fingerprints.

In terms of the current domestic monitoring resources, anyone has the ability to become the protagonist of the video, it just depends on who can recognize the pearls.

Of course, this is definitely not easy, especially for those who are on the wanted list of the ministry, the county bureau can't find them, the municipal bureau can't find them, and then report them to the provincial department, and then to the ministry.

Among them, not everyone will try desperately at every step, but various comparisons are also indispensable.

Catching a fugitive easily is equivalent to winning the third-class merit easily. In essence, it is still a bit of Versailles.

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

"Do we have to follow the surveillance?" Zhuang Wei actively participated.

Wei Zhenguo couldn't help but look at Jiang Yuan.

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

Wei Zhenguo then smiled at Zhuang Wei: "It would be best if we can find where this guy is."

He didn't know how Ben Guo knew Zhang Wanjie, but since he was on the wanted list, he was probably very alert. It is very likely that he would not tell Ben Guo where he was.

Zhuang Wei enthusiastically invited Wei Zhenguo back to his office.

In a place like Ningtai County, he didn't meet a wanted person for several years, so he was also very active. Although it is also possible that Zhuang Wei and others did not have the ability to catch the fugitive before, Zhuang Wei was still enough just to follow the surveillance.

Wei Zhenguo walked into the video office while making a phone call.

Ben Guo must be interrogated more. He even had certain expectations for him.

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

Judging from the fact that Ben Guo's life has improved, his artistic sentiment has been brought into play, and stealing has become a daily hobby, Ben Guo must have a new way to make money, and he is still stupid.

Wei Zhenguo hopes that he can find more things through Ben Guo.

"Let me see, 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 and helped analyze the route from time to time.

As he watched, Zhuang Wei sighed and said, "Jiang Yuan seems to have good luck. He can always catch such big cases."

Wei Zhenguo stared at the screen and smiled, "Maybe the technology he uses is much higher than the normal level."

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

As for the video of the bus station, if it was handed over to them, it would definitely be a waste of time, and the so-called pursuit would naturally be out of the question.

Based on Zhuang Wei's understanding of image detection, unless it was directly handed over to the image detection brigade of the provincial department, the level of Qinghe City Bureau would be just that. But without some solid evidence, how could the video be handed over to the image detection brigade of the provincial department?

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

Jiang Yuan just broke this boundary and easily caught him out.

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

To clearly surpass colleagues and exceed the average level of the industry is actually a very high requirement.

After figuring this out, Zhuang Wei's tense muscles relaxed again.

Love whoever you want.

Tired.