Chapter 663 The last board
Yes! have! have!
So interesting!
The small topic that Professor Gao talked about might turn out to be a big thing in their hands, at least no smaller than this one.
"Yes! Professor Gao, if there is anything we can do, please feel free to arrange it."
There is no need to report back to the unit. The comrades who work on the compression software will stop talking first.
This store may not exist after passing this village.
As for whether the unit will blame him for making the decision without authorization? I think the leaders of the unit should have a healthy mind.
Chief Engineer Chi of the Computing Institute had envy in his eyes. Professor Gao's work, no matter how small, was definitely groundbreaking.
Modify the original thing? People don't have time to know.
However, he could also guess that Gao Zhendong's subject was mostly related to algorithms. In this regard, the Institute of Computing Technology was indeed unable to compete with comrades majoring in applied mathematics.
Seeing that his comrades were so active, Gao Zhendong did not tempt them.
“Let me tell you first, so you can make relevant preparations early. My idea is to develop a set of lossy compression algorithms for images and supporting software modules.”
This is what Gao Zhendong wants to do, multimedia applications. Computers can't support it now, so he hasn't mentioned sound compression for the time being. After all, that thing needs to be decompressed and played back in real time. Computers these days are really a bit weak. Can't live.
But the picture is different. This thing is in the file, so it is really useful.
At the same time, for documents such as official documents and papers, which do not require too high resolution, 320*240 256-color or 256-grayscale images are of great use. If such images are properly compressed, the size is only 20k~30k. It is still affordable for the disks under development, not to mention the tapes.
In terms of vector graphics and vector fonts, the comrades who are cooperating with the Delta Aircraft Company on industrial software are already working on it with Gallic Chicken, so there is no need for Gao Zhendong to bother with it.
But bitmaps don’t exist yet. Now that there are comrades who are engaged in compression software, we might as well do it together.
Compressed bitmaps are still bitmaps in essence, and it doesn’t matter whether the suffix is bmp or jpg.
Bitmaps and vector graphics each have their own uses. At least in Gao Zhendong’s previous life, no one wanted to use pictures such as photos in vector graphics format. That would make people crazy or not, anyway. The computer went crazy first.
A common example is that the maps in navigation software are all vector images, but their satellite maps are all bitmaps.
Gao Zhendong’s words stunned all the comrades present.
Lossed? If there is a loss, then why bother?
The main reason is that I have never done this kind of thing before. I have no contact or concept at all. Some things are unimaginable.
The comrade working on the compression algorithm first asked: "Professor Gao, is it lossless?"
Unexpectedly, Gao Zhendong shook his head: "It's just lossy. Pictures are for people to see. The human eye has limited abilities. In fact, the loss of some details is not very visible, or it can be said to be acceptable."
Seeing that everyone was still doubtful, Gao Zhendong gave an example.
“If there is a person, whether he is darker or whiter, and whether the pit on his face is bigger or smaller, will it affect your ability to recognize him?”
All comrades are Shaking his head, he knew some people even if they turned into ashes.
“That’s right, the same goes for pictures. And the core of the lossy compression algorithm is to figure out what information can be lost without affecting the effect.”
The core reason why the compression rate of the lossy image compression algorithm is amazing lies in this "lossy".
When a bmp of several megabytes is compressed into a jpg, the compression rate may be as high as 90%. For this reason, lossless compression does not have such a high compression rate, unless the colors and lines are very simple.
Seeing Gao Zhendong’s determined expression, the comrades working on the compression algorithm were relieved and thought about it carefully. Professor Gao’s words really made sense.
The next words of Gao Zhendong made them feel completely relieved, but also felt a little bit unsatisfied.
“Actually, I have almost finished this algorithm, but I don’t have time to perfect it and implement it through programming, so I want to leave this work to you. Since you have experience in compression software, I think it should be available soon. Results.”
In fact, it is not accurate to say that it is imperfect. After all, how can one say that the JPEG compression algorithm is perfect or imperfect? That's it, and it can definitely be used and the effect is definitely good. But I still have to say this, leaving some space and leeway for the participating comrades, lest others think that they have no great contribution.
Chief Engineer Chi, who was on the side, secretly sighed that it was still the case. Professor Gao’s project, also known as "feeding", he had solved the most difficult part, and the remaining Probably all can be classified into strength work.
"Okay Professor Gao, we will come to you as soon as possible to ask for relevant knowledge. But why not just make it into a software, but just make it into a software module?"
Software and software modules They still understand the difference.
"Because there may be a lot of software used to display images, it can be made into a module for them to call easily. Don't think that the algorithm has been studied, and your job is simple. In fact, what you have to complete is A complete system for displaying images on a computer, for example, the most basic one is the representation of color.”
Gao Zhendong said this, firstly, to remind them not to take it lightly, and secondly, to speak for them. It seems that their algorithm part is just perfect, but the difficulty and workload are actually not small.
Gao Zhendong's words shocked some comrades who "underestimated the enemy". They were still shallow and couldn't be careless.
"We will pay attention, Professor Gao."
After arranging this matter, the computer's media display capabilities are basically over for the time being. Gao Zhendong is not prepared to do more, it is too much luxury.
In fact, until the 1980s, "multimedia" was a luxury product on computers. In the 1990s, our computer advertisements still used multimedia as a selling point. In those days, even the sound card was a separate expansion card.
With text and pictures, it is basically enough for scientific research, office work, etc. If you really want to listen to sounds, MIDI is just fine. This thing is essentially a music score file, which can be synthesized directly. The computer can barely handle the frequency.
All parties involved were very satisfied with this review meeting.
The comrades who worked on compression software got a new topic. Gao Zhendong completed the last piece of basic computer capabilities, while other comrades saw a new possibility of computers, and each took what they needed. yes.
——
Among the high mountains in the southwest hinterland, on the construction route of an important railway, thousands of railway troop soldiers are scattered on various construction sites, building this road in full swing.
The site was very difficult. Although there was little shortage of food, the steep cliffs, deep canyons, dense woods, flying insects... all of this still brought endless trouble to the soldiers.
But the soldiers didn't care much about this. They still worked hard and enthusiastically, shedding sweat and even blood. A long line stretched to both ends of each construction site and closed one by one.
At a certain construction site, the commander was looking at the cliff in front of him with a frown.
“Batalion Commander, the construction machinery must be sent up here, otherwise the soldiers will not be able to complete the task even if they just work piecemeal on it.”
"Well, it takes an hour to climb up every day, and another half hour to come down. The soldiers don't complain about the hard work of hammering and chiseling, but they are worried that the progress is too slow, and the flood season has not passed yet. Once it rains, the construction difficulty will be If the temperature increases sharply, the construction conditions will drastically increase. It’s getting worse. It’s no joke that the weather in this place never gets sunny for three days.”
The battalion commander frowned after hearing the words of several company commanders and local comrades. I thought for a while: "Can you not come down every day? We will take the lead." Eat on top! Live on top! Try to use all your time to complete the task as soon as possible?” There are not many places where time can live; It is easy to accumulate water. If you do this, you will probably not be able to escape rheumatism, which will cause too much damage to your body. We have experience in this matter and cannot do this if we specially open up a place to live. , but it will delay the construction period even more.
A company commander also shook his head: "This is the same thing. The main reason is that it is still difficult to complete the task. Although the limestone here is not as hard as granite, it is still very slow by manpower. And resting on it It’s not appropriate either. You are unprepared when you are resting. Before the project is completed and the slope protection is formed, the rockfall situation above is very serious. It is very dangerous for people even if they are awake, let alone completely asleep.”
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Another company commander made a suggestion: "Then we should use geotechnical blasting to speed up the progress."
This suggestion was rejected by the battalion commander: "No, I am afraid that if it collapses accidentally, it will completely destroy the roadbed. Conditions, once the roadbed conditions are damaged, the route must be changed. This section is the best choice. The loss of the route will be very large!”
After deliberation for a long time, we still have to find a way to send the machinery up.
Looking at this newly produced excavator, I heard that it was developed after the 11th Machinery Department obtained new materials. It is easy to use, but no matter how easy it is to use, it has to reach the working surface. I can't even get up to work, and everything else is in vain.
But this is not easy, otherwise they would not have to hold the Zhuge Liang meeting here.
The construction machinery weighs 6 to 7 tons, and it is impossible to lift it up as a whole. I don’t know how many wooden hangers have been broken, and how many steel beams have been bent. If you can’t get up, you can’t get up, and you almost hurt someone.
In fact, an excavator weighing several tons will be regarded as a little brother at best in the future, but these days, it is an out-and-out large-scale construction machine.
It is not practical to dismantle it. The construction machinery has a large number of hydraulic structures. The conditions here do not support it, and the decomposition can only be incomplete. It is still unknown whether it can be hoisted up.
(End of this chapter)