Chapter 270 This is a special yet ordinary day
Speaking of which, Xu You's ability to come up with such an idea had a lot to do with Lou Song.
When Lou Song was solving the bug in the Xueba Community app, he thought of converting the APK code into a mathematical model.
It was at that time that Xu You learned this method from Lou Song and came up with his current idea.
Many things cannot be learned from textbooks, but can only be learned through contact with masters.
After converting the satellite's positioning problem into a regression problem, Xu You's idea was to edit a convolutional neural network to directly regress all candidate areas.
In this way, the probability of the corresponding category can be predicted, the problem of overlapping candidate regions can be solved, and real-time detection of targets can be achieved.
Greatly improve the satellite's detection efficiency of ground targets and improve the detection accuracy.
In the following period of time, Xu You started working on this plan.
This solution seems to be just an optimization of an algorithm, but it is closely related to the design and engineering of the satellite.
Xu You needs to understand every detail of the previous generation of high-resolution satellites more accurately and deeply in order to better complete the algorithm optimization work.
During this period, Xu You communicated with many satellite designers and engineers, optimizing every detail bit by bit.
Work was still in progress until New Year's Eve.
"Teacher Xu, let's go to the cafeteria to eat dumplings together later."
"Okay, Mr. Yu."
After working for many consecutive days, Xu You's concept of time has become very vague.
I didn't even notice that it was already New Year's Eve.
Fortunately, through these days of work, the algorithm optimization work has been basically completed.
Because this time, the satellite itself did not undergo any major changes, which saved most of the time in satellite development and testing.
If everything goes well, the satellite will enter the launch preparation stage after the new year.
In the cafeteria, the steaming dumplings are already out of the pot.
Wu Jing also came to the cafeteria and saw Xu You with a smile on her face.
Xu You still remembered that the reason Wu Jing asked him to come over was because she wanted him to celebrate the New Year with Wu Jing this year.
But since coming here, Xu You can't even see Wu Jing every day.
It can be seen that Wu Jing has a heavy workload and needs to handle a lot of work.
As for Wu Jing's specific responsibilities, Xu You is not very clear now.
Xu You only knew that although everyone here called Wu Jing "Teacher Wu", Wu Jing's status was not even lower than that of the leaders of the Academy of Aerospace.
"Come and eat at my table."
At this time, Wu Jing did not deliberately avoid suspicion, but called Xu You over directly.
Xu You nodded and came to Wu Jing's side.
This is the first time Xu You and Wu Jing have eaten at the same table since coming here.
Before, Wu Jing didn't have much contact with Xu You because of her busy work.
In addition, the special relationship between the two sides is also one of the reasons.
If there is no work need, Wu Jing would not call Xu You to her side often.
However, on New Year's Eve, Wu Jing no longer wanted to avoid suspicion.
"How is it? Is it delicious?" Wu Jing asked with a smile.
"It's delicious! Did you make it?"
"How is that possible? When we were at home, it was always Professor Xu who cooked. The dumplings were made by the canteen staff, and a few colleagues from the Fifth Hospital who were not so busy also joined in. We all stayed here for the New Year, and at this time, this place was just like home."
Wu Jing deliberately added the word "old" in front of "Professor Xu" to distinguish Xu Zhou from Xu You.
After all, there are now two Professor Xu in the Xu family.
Xu You felt the atmosphere in the cafeteria and it really felt like celebrating New Year at home.
They seemed to have gotten used to not being able to go home for the New Year.
We are not just colleagues, we are also family.
"How is it? Do you miss home now?" Wu Jing asked.
This is the first time since Xu You was born that he has not spent the New Year at home.
"I kind of miss you... but now that you're here, I don't miss you that much ..."
Perhaps it was because Xu You had too few opportunities to be with Wu Jing. Compared to being with Xu Zhou, Xu You cherished the opportunity to be with Wu Jing more.
At this time, this year's Spring Festival Gala was being broadcast on the TV in the cafeteria.
Xu You had no interest in the content of the party, but as the BGM of the New Year's Eve dinner, the Spring Festival Gala was still an indispensable part.
As the New Year’s Eve bells ring, the Lunar New Year arrives.
At this moment, there are still many staff members who are still working hard at their jobs.
For them, this special day was no different from any other day.
…
After the Lunar New Year, Xu You and others continued their work.
After continuous adjustment and improvement, Xu You further optimized his algorithm and completed the editing of the final version of the algorithm.
Wu Jing organized the final meeting. If everything went well, the new generation of high-resolution satellite would enter the preparation stage for launch.
At the meeting, Xu You gave a speech about his optimized algorithm.
"In the latest version, after optimizing the convolutional layer, the algorithm calculation amount can be further reduced and the detection efficiency can be improved. At the same time, in order to address the problem of large differences in the size of ground objects in satellite images, the multi-scale feature map fusion technology is used to maximize the detection accuracy of the target."
Xu You has ensured through precise simulation that the Gaofen satellite can achieve higher ground resolution after the final optimization.
"Teacher Xu, according to your calculations, what resolution can the satellite achieve in this new solution?"
"It's probably between 30mm and 50mm. At a resolution of 50mm, objects will basically be clearer."
In fact, the US Keyhole satellite, although in terms of specifications, claims to be able to achieve a ground resolution of 100mm.
But in actual use, the effect is not that good.
At a resolution of 100mm, the image of the ground target detected by the Keyhole satellite displayed on the screen is just a dot.
If you want to truly distinguish the size, appearance and other factors of the target.
The resolution must also be adjusted to a larger value. In theory, it needs to be 5 to 6 times the ground resolution.
After Xu You completed the optimization of the algorithm, the 50mm resolution was not just a promotional data.
It is truly possible to accurately detect targets on the ground at this resolution and restore them into a clear image.
Although it’s not that serious, it’s not so exaggerated that you can even see the license plate number.
But it is basically possible to tell how many people are in the picture.
