wavenovel Chapter 1280 Screening
Chapter 1280 Screening
Chapter 1280 Screening
"The coffee is good." Liu Jinghui took another cup of coffee, drank it in one gulp, and then went back to verify the timeline.
Master Wei saw that he didn't care about what was happening outside, then turned to look at Jiang Yuan who was concentrating on thinking in front of the computer, and shook his arms to make coffee again.
"Master." Jiang Yuan suddenly looked up and shouted.
"Ah! Master." Wei Shixun stepped forward immediately.
Jiang Yuan looked at Master Wei carefully and said, "I saw the exercises you did recently, and you have made some progress."
"Ah...it's because of Master's good teaching." Wei Shixun was grateful in his heart for the days and nights that he and his senior sister had endured.
"Did you understand the steps I just performed for image enhancement?" Jiang Yuan asked again.
"That's still a little short." Wei Shixun said with a wry smile, "The steps are quite complicated, I may need some time to learn."
"You can try it." Jiang Yuan said, motioning Wei Shixun to sit next to him.
A sensible local technician immediately moved a set of computers and monitors to Wei Shixun's side.
Before Wei Shixun could object, the computer screen in front of him lit up.
He looked at Jiang Yuan on his left, then at the screen in front of him, and it felt a bit like he was taking an exam next to his teacher.
"If you can't do it, just tell me. You can try in a few more directions instead of just one direction." Jiang Yuan checked the software on the computer and threw a few more videos to him.
Teacher Wei hesitated and said, "I haven't made much progress in math..."
"As long as you know how to use the software, you can use it. Whether you can upgrade it depends on your future talents." Jiang Yuan waved his hand, signaling Wei Shijian to go into battle.
Wei Shixun nodded with difficulty, like a sensible golden monkey, and carefully opened a copy of the original video, made a backup first, and performed a hash value verification.
Next, after determining the video format, Wei Shixun began to pre-process the video. He first used Neat-Video for noise reduction, trying to remove granular noise or compression artifacts, then used multi-frame averaging for time domain noise reduction, and Gaussian filtering and median filtering for spatial domain noise reduction. During this period, although it was the software that did the work, just filling in various values made Wei Shixun's brain a little overloaded.
He took a peek at Jiang Yuan and saw that whenever Jiang Yuan encountered a problem while scanning the surveillance video, he would call up the software and it would click several times, with many values being modified rapidly.
People who don’t know much about the business may think that Jiang Yuan is a skilled worker, but only Master Wei knows that Jiang Yuan is an expert in calculation.
Just like ordinary people know that sin45 degrees is equal to the square root of two, which is approximately equal to 0.707, the standard deviation of Gaussian noise is commonly taken as 1.5 to 2 in low-light monitoring. But when you want to preserve the edge, you can take the value of 1.0, or use bilateral filtering instead. But in many cases, you need to borrow the GaussianBlur function and calculate it according to the kernel size...
Compared to before, Wei Shixun has understood a lot of principles, but Gaussian noise is just a small step in the preparatory process...
A few hours passed in a flash.
During the break, Jiang Yuan remembered Wei Shixun, so he walked over like a school teacher. He saw two computer screens in front of Wei Shixun. The screens were lit, the cursors were flashing, and Wei Shixun's eyes were open, that was all.
"Have you encountered a bottleneck?" Jiang Yuan asked gently.
Since we have accepted the mission of the second generation, we must continue to do it.
Master Wei looked up at Jiang Yuan blankly, then shook his head violently and said, "There are so many bottlenecks."
"How far have you gone..." Jiang Yuan was not in a hurry. He himself was a cheater, so he knew the difficulty of image detection. This thing was a skill that would make a normal person abnormal. Fortunately, Master Wei was not abnormal to begin with.
Master Wei raised his head in embarrassment: "I wanted to remove motion blur, and thought of using Wiener filtering, but it turned out to be a mess..."
"Then use blind-area convolution and focus-magic. I'll teach you how to adjust it." Jiang Yuan stood behind Wei Shixun and taught him step by step.
Several Malaysian technicians stood in front of him, listening with wide eyes. Zhong Renlong also tried his best to translate, but his voice became lower and lower when faced with a long list of professional terms and numbers.
"I'm done here." Liu Jinghui's eyes were red from drinking coffee and he walked over.
"Have you identified the suspect?" Jiang Yuan left Wei Shixun behind.
"At present, there are four people who have no alibis. Or their alibis are incomplete. Of course, I am stricter." Liu Jinghui paused, then looked at Jiang Yuan and said, "All of this is based on the time of death of the three deceased, accurate to within four hours."
"No problem within 4 hours." Jiang Yuan nodded.
Jiang Yuan used the temporary +1 to determine the death timeline based on the temporary LV7's death time. Theoretically, this time interval can be shortened, but if the suspect is to be judged based on this, Jiang Yuan still gave the enemy a lenient estimate.
Liu Jinghui nodded: "Although there are three murders, the murderers committed the crimes during their rest time, two during the day and one at night. There is very little room for screening for the night case, and the remaining two daytime cases helped screen out most of the people."
Liu Jinghui then displayed the PPT of his and Wang Chuanxing’s achievements on the projection screen.
After the gorgeous opening animation, each name was followed by their own timeline.
In the three cases, with an emphasis on the first two, each person's timeline of the day, especially the total 4 hours before and after the victim's death, was organized in exceptional detail.
Liu Jinghui pointed with a laser pen and said, "From the timeline, the murderer has escalated his murder three times. For example, in the third case, the murderer chose the time and place of the murder, and the surveillance was completely ineffective."
Liu Jinghui: "The four people I finally selected were actually more than I expected. I originally thought that there were 4 people, but after a rough screening, even if we relaxed the screening conditions, there might be only one or two people who could meet the time requirements for committing three cases at the same time. I was even prepared for no one. At that time, we had to consider the possibility of outsiders committing the crime."
Liu Jinghui: "But judging from the results, half of the people, mainly technicians, actually work independently most of the time and are not under surveillance. For example, those who install sunshade nets, do machine repairs, and do pruning and planting, not only do they work outside most of the time, they don't even go back to eat at noon, which also gives the murderer an opportunity to take advantage of them."
Liu Jinghui: "In short, the last four people are production manager Li Wanzhong, mechanics Zhang Fan and He Jun, and general worker He Cheng."
Following his words, Wang Chuanxing unfolded the form of four people.
Liu Jinghui coughed twice and said, "Among them, Li Wanzhong is the employee who has worked in the rubber plantation for the longest time and is also the oldest. As one of the persons in charge of the rubber plantation, Li Wanzhong has a lot of work to do every day and has to spend most of his time in the office. When the two murders occurred, Li Wanzhong had no alibi, which is also a suspicious factor..."
"Wait a minute!" Ni Cha looked at his cell phone and suddenly interrupted Liu Jinghui.
Several people looked over.
Nicha showed the screen of his mobile phone: "Li Wanzhong committed suicide in the room."
(End of this chapter)