Scholar’s Starry Sea

On November 10th, Wu Bin boarded a plane to Philadelphia.

In previous years of national college student Physics competitions, students from all over the world actually sent their papers to the official mailbox after completing the question and answer, but this year I don’t know whether the American Physics Association or the Astronomical Association has made a fortune. An invitational game was opened with the University of Pennsylvania as the venue.

As one of the eight well-known Ivy League schools, what Wu Bin knows most about this university is that its research capabilities are very strong.

Because the first general-purpose electronic computer ENIAC was born here, Penn is also known as the Place of Origin of modern computer science civilization.

Sitting on both sides of Wu Bin are two of his teammates, one is Senior Zheng Wenhan, a junior from Xinyuan, and the other is Senior Senior, Jiasheng from Wuyuan.

At this moment, the two people flying to Philadelphia can be said to be full of joy. Because the United States will host the game in the country this time, it is not possible to participate as long as the team that has signed up as in previous years.

Otherwise, that many universities in the world, each university has several teams, the number of people in this invitational tournament will not explode, and no matter how rich it is, it can't be burned.

So in order to select the participating teams, all countries have conducted their own trials.

It was in the trials that Zheng Wenhan and Silk Jiasheng really realized how thick the "thigh" they were holding.

The title of this trial is "Camera Positioning", and the first question alone confuses the two.

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

After reading it, Bo Jiasheng, who is in charge of modeling, really called a scalp numb. The main problem is too realistic. The knowledge of optical imaging is not enough.

While Si Jiasheng was madly scratching his hair, Wu Bin suddenly leaned in front of the computer and said: "This question is quite fun."

"You are interested in God. "" Silk Jiasheng looked back at Wu Bin and asked affectionately.

"I'm very interested, but don't worry, I won't take you for fun, I'll wait for you..."

Since Jiasheng heard it, he quickly grabbed his hand and waved his hand. "Don't, don't, don't, God, please be sure to steal my fun, I really can't enjoy it..."

Then Silk Jiasheng felt the biggest time in life Shock, because after he finished saying this sentence, he read from Wu Bin's surprised eyes, "Will you not do such a simple question?" This message made him feel a little uncomfortable.

However, after Wu Bin's series of cloud-flowing operations with a little instructional meaning, Bo Jiasheng was completely convinced.

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

"Finally, we only need to establish a distortion compensation model for the coordinates with relatively large errors and perform error corrections." After Wu Bin's calculations, he looked at Bo Jiasheng, who was completely shocked, said.

"Oh, so that's how it is."

Si Jiasheng kept nodded and looked at Wu Bin's eyes more and more worship.

In fact, when teaming up, he once suggested that it is best to find a Mathematics major to be responsible for the thesis. After all, he is not very confident in the algorithm. If there are a few experts in the team, Can discuss it.

But at that time, Director Jiang gave him a sentence, "You don’t need anything in your team, don’t worry."

Until now, Bo Jiasheng finally understands this. The deep meaning of the sentence.

This thigh Junior Brother is a full-scale Deity!

After successfully establishing the two-dimensional computer image coordinates, Wu Bin pointed to the second question and said to Silk Jiasheng: "You can try the second question. Just use the model of the first question and compare these two The target and its image given in the picture respectively, bring in the known quantity, and calculate the image coordinates of the center of the circle on the target on the image plane."

"Okay...I will try."

Can be selected by Director Jiang to come to this sharp knife team. Of course, Si Jiasheng will not be a scum who only shouts "666". He solved the first question perfectly in Wu Bin and pointed him to the second. In the case of asking the solution, he has transitioned from being out of sight of his fingers to seeing the sun.

……

In the end, Wu Bin, the squad, successfully won the gold award, and Wu Bin's paper was highly praised by the judges.

Except for Bo Jiasheng who has completely become Wu Bin's fanboy, Zheng Wenhan has not escaped either.

Because of the huge amount of question data, he is also under great pressure as a programming.

By the end of the night until 3 o’clock on the first day, Zheng Wenhan was already yawning for a long time, and it was almost impossible for Red Bull to drink it with coffee.

Wu Bin said to him when he saw it: "Go to sleep when you are sleepy, don't let your body break."

Zheng Wenhan smiled bitterly after listening, and squeezed The bridge of the nose said: "It's not that I don't want to go to bed, but that there are too many things to do. I'm afraid I won't be late tomorrow."

"It's okay, I will fill the rest for you."

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At that moment, Zheng Wenhan felt that Wu Bin's silhouette was so stalwart!

With such thighs, Bo Jiasheng and Zheng Wenhan can really wake up with a smile when they fall asleep, but they didn’t intend to really degenerate into teammates who enjoy lying down. They asked Wu Bin a lot of questions along the way. , I hope that in the United States, I can independently complete the part that I should complete.

At 8:00 local time in the United States, Wu Bin and their flight landed steadily, and the entire group of high-spirited and vigorous walked out of the airport.

These three people are all coming to the United States for the first time. They all have a strong interest in this country that stole chicken crazily during World War I and World War II and became the number one in the world.

While waiting for the luggage, Wu Bin looked at the two people next to him and asked: "Do you know how to spell the English name of Philadelphia?"

"Philadelphia?" Silk Jiasheng quickly replied .

"Well, these two are actually Greek words, philus means the city of brother, and adelphus means love."

Bo Jiasheng who learned new knowledge After listening to Zheng Wenhan, he knew it was nodded, but soon became frowned and found that things were not so simple.

"Brother's love???" Silk Jiasheng was shocked.

"Yes." Wu Bin nodded, "The nickname of Philadelphia is cityofbrotherlylove."

"It sounds like gaygay..." Zheng Wenhan couldn't help saying.

"Shhh..." Wu Bin immediately made a silent gesture to him, and took a peek at the two black big brothers next to him, and found that they didn't seem to hear them, so they were relaxed.

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

"Understood." The two were nodded for a while.

From leaving the airport to the University of Pennsylvania, apart from those buildings with completely different styles from China, the biggest difference is that almost every street can see people performing, singing, and dancing. , Drawing, playing, everything. I don’t know if this is the unique Philadelphia culture or the United States.

PS: After a while, I have a vacation. Thank you for your hard work.