On November 10, Wu Bin got on a plane to Philadelphia.

In previous years, the National Collegiate Physics Competition was actually a matter of students from all over the world completing the Q&A and sending their papers to the official mailbox, but this year, I don't know if it was the American Physical Society or the Astronomical Society that made a fortune, and even set the University of Pennsylvania as the venue for the competition to hold an invitational tournament.

As one of the eight prestigious Ivy League universities, Wu Bin knows the most about this university is that they are very strong in research.

In addition, because the first general-purpose electronic computer, ENIAC, was born here, Penn is also known as the birthplace of modern computer science civilization.

Sitting next to Wu Bin were his two teammates, one was Zheng Wenhan, a junior senior of the Academy of Letters, and the other was Bo Jiasheng, a junior senior of the Academy of Things.

At this moment, the two people who flew to Philadelphia can be said to be full of joy, because the United States is going to hold the competition on its home soil this time, so they can't participate as long as the team that has signed up can participate as in previous years.

Otherwise, there are so many universities in the world, and each university has several teams, and the number of people in this invitational tournament will not be exploded, and no matter how rich you are, you can't afford to burn it.

So in order to select the participating teams, each country has its own selection competition.

And it was in the selection competition that Zheng Wenhan and Bo Jiasheng really realized how thick the "thigh" they were holding.

The title of this selection competition is "Camera Positioning", and the first question alone directly confused the two of them.

[On the basis of the pinhole linear model, through the calibration of the internal and external parameters of the digital camera, the coordinate transformation relationship between the target and the target image is determined, and the coordinate conversion model is established.] 】

Bao Jiasheng, who is in charge of modeling, really calls a scalp numb after reading it, and the main problem is too realistic, and the relevant knowledge of optical imaging is not enough at all.

And just when Bao Jiasheng was grabbing his hair, Wu Bin suddenly came to the computer and said: "This question is very interesting." ”

"Great God, are you interested?" Bao Jiasheng looked back at Wu Bin and asked affectionately.

"I'm interested, but don't worry, I won't rob you of your fun, I'll wait for you ......"

When Bao Jiasheng heard this, he hurriedly grabbed and waved his hand and said: "Don't don't, don't be, the great god must rob me of this fun, contemptible people really can't enjoy it......"

Then Bao Jiasheng felt the biggest blow in his life, because after he said this, he read from Wu Bin's surprised eyes, "Can't you do such a simple question?" This kind of information still makes him feel a little uncomfortable in his heart.

However, Wu Bin's next series of operations with a bit of teaching meaning made Bo Jiasheng completely convinced.

From using a 3X4 matrix to establish the direct correspondence between the space five points and the two-dimensional image points, to solving the internal and external parameters of the camera, and then finding the image coordinates of the circle center on the target and the image plane of the camera, it is all in one go.

"In the end, as long as the distortion compensation model is established for the coordinates with a relatively large error, the error correction can be carried out." After Wu Bin finished calculating, he looked at Bao Jiasheng, who was already completely stunned, and said.

"Oh, I see."

Bao Jiasheng nodded vigorously, looking at Wu Bin's eyes more and more worshipful.

In fact, when forming a team, he once suggested that it was best to find a big bull in the mathematics department to be in charge of the paper, after all, he was not very confident in the algorithm, and if there were experts in the team, he could still discuss it.

But at that time, Director Jiang gave him a sentence, "Your team doesn't lack anything, don't worry." ”

Until now, Bao Jiasheng finally understood the deep meaning of Director Jiang's words.

This thigh-thigh junior is completely an all-round god-man!

After successfully establishing the coordinates of the 2D computer image, Wu Bin pointed to the second question and said to Bo Jiasheng: "You can try the second question, as long as you use the model of the first question, bring in the known quantity of the target and its image given by the two pictures respectively, and calculate the image coordinates of the center of the circle on the target on the image plane." ”

"Good...... I'll try. ”

Can be picked by Director Jiang to this sharp knife team, of course Bao Jiasheng will not be a scumbag who can only shout "666", in the case of Wu Bin perfectly solving the first question and also pointing out the solution to his second question, he has transitioned from reaching out to see the five fingers to seeing the sun.

……

In the end, Wu Bin's team successfully won the gold medal, and Wu Bin's paper was unanimously praised by the jury.

And except for Bao Jiasheng, who has completely become Wu Bin's fan brother, Zheng Wenhan has not escaped.

Because of the huge amount of data in this kind of problem, the pressure on him as a programmer is also very great.

On the first day, when it was 3 o'clock all night, Zheng Wenhan was already yawning, and he almost drank Red Bull with coffee.

When Wu Bin saw it, he said to him: "If you are sleepy, go to sleep first, don't burn your body." ”

Zheng Wenhan smiled bitterly after hearing this, pinched the bridge of his nose and said, "It's not that I don't want to sleep, it's that there are too many things to do, and I'm afraid that I won't be able to do it tomorrow." ”

"It's okay, I'll help you make up for the rest."

At that moment, Zheng Wenhan felt that Wu Bin's figure was so majestic!

With such thighs, Bao Jiasheng and Zheng Wenhan can really wake up laughing when they fall asleep, but they don't plan to really degenerate into teammates who enjoy lying down and winning, and they asked Wu Bin a lot of questions along the way, hoping that when they play in the United States, they can independently complete the part they should complete.

At 8:00 local time in the United States, Wu Bin's flight landed steadily, and the group walked out of the airport in high spirits.

All three of them came to the United States for the first time, and they all had a strong interest in this country that went crazy to steal chickens in World War I and World War II and thus became the number one country in the world.

While waiting for the luggage, Wu Bin looked at the two people next to him and asked, "How do you spell the English name until Philadelphia?" ”

“Philadelphia？” Pa Jiasheng quickly replied.

"Well, in fact, both of these are Greek words, philus means city of brothers, and adelphus means love."

Bao Jiasheng and Zheng Wenhan, who had learned new knowledge, nodded clearly at first, but soon frowned and found that things were not so simple.

"Brotherly Love??? Bao Jiasheng was shocked.

"Yes." Wu Bin nodded, "Philadelphia's nickname is City of Brotherly Love." ”

"Sounds gaygay ......," Zheng Wenhan couldn't help but say.

"Shhhh......hhhh

"Other people's territory, be cautious in your words and deeds." Wu Bin whispered.

"Understood." The two nodded.

From leaving the airport to the University of Pennsylvania, the biggest difference along the way, except for those buildings with a completely different style from the rest of the country, is that you can see people performing, singing, dancing, drawing, playing, you name it, and I don't know if this is the unique Philadelphia culture or the United States.

PS: I've been busy for a while and have a vacation.,It's hard for you to wait for more readers.。