Graphic detective is a criminal science major with a very high upper limit and a very low lower limit.
As for the upper limit, just for image denoising technology, there are countless noise and clear image models, and they are 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 noise reduction, DCT noise reduction, PCA noise reduction, K-SVD noise reduction, non-local mean noise reduction, WNNM noise reduction, etc...
Writing algorithms and making models is not the upper limit of image research. In order to substantively process the images and images faced by image research, it is necessary to master various algorithm models and have considerable experience in processes and methods.
You must also have considerable mastery of relevant technologies.
Of course, such upper limit requirements may not be met not only in the province, but also nationwide.
In places like Ningtai County, in most cases, the existence of imaging offices and the like is just to meet the minimum requirements to find surveillance videos and keep an eye on people.
It doesn't matter if you can't keep an eye on it occasionally.
Zhuang Wei and others originally only worked 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 cross this gap.
It can be seen but cannot be touched, which is really uncomfortable.
Jiang Yuan took out another set of videos, looked at the third-generation video man next to him, thought for a while, and simply said: "Different graphics and images require different methods. With the current technology, it is impossible to have one
A universal algorithm 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 than before and filled in the parameters.
The core of image enhancement is the algorithm. Using different software is actually choosing different algorithms.
For users, after selecting an algorithm, the most important task is to fill in the parameters. And there are a lot of parameters.
The videos of each case are different and require different processing procedures. These are problems that are easy to solve manually but difficult to solve with programs.
Just like the video Jiang Yuan is seeing now, it is a surveillance video with backlighting in the distance. The two targets appear in the lower left corner of the video, so they are slightly deformed.
These are areas that are not easily taken into account by the algorithm, 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 the user makes empirical judgments.
Jiang Yuan turned on and off multiple software, filled in a large number of numbers, and then started running the program again.
The three generations of image men saw this process clearly, and gradually became desperate.
"You didn't seem to fill in so many things last time." Zhuang Wei, a generation of imaging men, asked Jiang Yuan politely.
Jiang Yuan said "Yes" and said: "The video conditions this time are a little worse. In addition, the algorithms used are also different. Some software requires more parameters to be filled in."
The 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's a little more complicated.
Zhuang Wei and the other three looked at each other, not knowing what to say.
Wei Zhenguo didn't care so much, so he sat next to him and smoked two cigarettes with Wu Jun in peace, then listened to the printer making a creaking sound.
"I'll get it." Wei Zhenguo jumped up and ran to pull over the four pictures from 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 why there are more parameters. Video processing is more complicated, and it is easier to produce more pictures.
After laying out several 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 the new guy now."
Wei Zhenguo found two groups and posted the photos.
Jiang Yuan packed up his things and handed the USB flash drive and other items for copying to Zhuang Wei.
As soon as the roar of the computer host stopped, a call came through Wei Zhenguo's cell phone.
"Where did you find the picture?" When the call was connected, there was a question immediately on the other end.
Wei Zhenguo smiled and said: "That can't be said, the case is still under investigation. Do you recognize the person inside? Do you know the name?"
The person on the other end of the phone hesitated for a few seconds and said, "It looks like it to me, but I'm not sure if it's true. Go search the library for Zhang Wanjie and see if it's true."
"The eucalyptus in your hand?"
"It's from the past. He was included in the pursuit of fugitives."
"Ha, let me take a look. Thank you very much. I'll invite you to smoke later." Wei Zhenguo said and hung up the phone.
Without him having to say anything, Jiang Yuan opened the "National Fugitive Personnel Information System" on the computer that had just finished roaring, and entered the words "Zhang Wanjie".
"Robbery, snatching, burglary, theft... There is no doubt that Jiangyang is a big thief." Wei Zhenguo said with the corners of his mouth raised. His mood was like a temporary check in a KTV and suddenly discovered that one of the beautiful women was a man and a fugitive.
Same……
"A Class B wanted order for the location." Zhuang Wei sighed: "This is a Class B arrest."
The wanted orders of ministries and commissions are divided into two levels. Level A is the list made by the ministry itself, which is the key fugitives that the ministry considers to be wanted. Level B is the list compiled by the ministry at the request of the provincial departments and departments, including rewards and connections, etc.
It's all left to the provincial department to do.
However, for grassroots police officers, catching a Class B fugitive is a very rare thing.
For graphic detectives, searching for fugitives is actually a routine job. For example, the graphic detective brigade in Changyang City has police officers looking for fugitives all year round, and their work is like searching for fingerprints.
As far as the current domestic surveillance resources are concerned, anyone has the ability to become the protagonist of the video. It just depends on who can discern the truth.
Of course, this matter is certainly not easy, especially when people on the wanted list of ministries and commissions are not found by the county bureau or city bureau, and then reported to the provincial department and then to the ministries and commissions.
Among them, not everyone may try desperately at every step, but various comparisons are indispensable.
Catching a fugitive easily is equivalent to obtaining third-class merit easily. In essence, it is still a bit like Versailles.
Wei Zhenguo was one step away from the fugitive, but he gritted his teeth and said: "We have to catch him. Just having clues will be wasted."
"Should we follow the surveillance to find it?" Zhuang Wei actively participated.
Wei Zhenguo couldn't help but look at Jiang Yuan.
"It's easier for them to find it than for me." Jiang Yuan said very realistically. His main ability is focused on image enhancement. As for following the surveillance, he doesn't know what it is like.
Wei Zhenguo then smiled at Zhuang Wei: "Then it would be best if we could find this guy's whereabouts."
He didn't know how Ben Guo knew Zhang Wanjie, but since he was on the fugitive list, he was probably very alert. Most likely, he wouldn't tell Ben Guo his whereabouts.
Zhuang Wei warmly invited Wei Zhenguo back to his office.
In a place like Ningtai County, we haven't met a fugitive pursuer 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 the fugitives before, but they just followed the surveillance. Zhuang Wei
Wei is still enough.
Wei Zhenguo entered the imaging office while making a phone call.
Ben Guo will definitely have to strengthen the interrogation, and he even has certain expectations for Ben Guo.
Such a stupid thief, you said he picked up fugitives at the bus station out of 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 fully developed, and stealing has become a daily hobby, Ben Guo must have found a new way to make money, and he is still very stupid.
Wei Zhenguo hoped that through Ben Guo, he could get more things out.
"Let me see, let's just follow the road to the bus station to find them." 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 can always catch such big eucalyptus."
Wei Zhenguo stared at the screen and smiled unconsciously: "Maybe the technology he used is much higher than the normal level."
Zhuang Wei was stunned. After thinking about it carefully, this was 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, so the so-called pursuit and escape would naturally be out of the question.
Based on Zhuang Wei's understanding of picture investigation, unless it is handed over directly to the provincial department's picture investigation team, otherwise the level of the Qinghe Municipal Bureau is just that. But without any solid evidence, how can the video be handed over to the provincial department's picture investigation team?
What about the detective brigade?
Zhang Wanjie may not know the details within the police system, but his long-term escape experience can probably tell him where the safe boundary is.
However, Jiang Yuan broke through this boundary and easily pulled it out.
Zhuang Wei figured it out, and his sense of loss doubled.
To clearly surpass your peers 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.
