Quantization is the amplitude of instantaneous value obtained by decentralized sampling.
Answer in detail, don't copy the definition of large paragraphs. . . This is more difficult than writing a paper. . .
What is the significance of image sampling in vray? Anything that is visible will eventually be presented through calculation. Computers use different calculation methods to "recognize" or "simulate" real light and shadow (texture is ultimately the reflection of light and shadow). My understanding: Samplers are different calculation methods of virtual reality (the principle is of course not just a calculation model, but each one is extremely complicated), that's all. There are several posts on the internet about the comparison (time and effect) of several samplers. Please refer to them. The difference of sampler effect is not the first thing for cartographers, but the balance between effect and time, that is, to get the best effect in the shortest time.
Question 3: What do you mean by image sampling in 3:3D max Vray? What is image sampling? Anything visible will be presented by calculation. Computers use different calculation methods to "recognize" or "simulate" real light and shadow (texture is ultimately the reflection of light and shadow). My understanding: Samplers are different calculation methods of virtual reality (the principle is of course not just a calculation model, but each one is extremely complicated), that's all. There are several posts on the internet about the comparison (time and effect) of several samplers. Please refer to them. The difference of sampler effect is not the first thing for cartographers, but the balance between effect and time, that is, to get the best effect in the shortest time.
Question 4: The sampling format of the image is 4: 2: 0. What does this mean? This is a signal format, which works on the principle of three primary colors. An image source converts a color scene or image into three analog primary color signals of red (R), green (G) and blue (B), and the three primary color signals are digitized, processed and transmitted to the terminal. The display terminal needs to reconstruct the R, G and B signals, and then reproduce the color image according to the additive color mixing principle. Digital TV system still transmits TV image information line by line and field by field in scanning mode. The top field and the bottom field form a frame image, and the moving image consists of a sequence of frame images. In fact, the scanning process is the sampling process of moving image sequence in space and time. For digital TV systems, pixel sampling is required for each line. As a result, the digital TV image consists of a series of sampling points, and each sampling point corresponds to a pixel of the digital image. Pixel is the smallest unit that constitutes a digital image. In this way, a digital image frame consists of a two-dimensional pixel lattice, while a moving image sequence consists of a series of digital image frames in time. In order to save transmission bandwidth, the transmitter converts the three primary color signals of R, G and B corresponding to each pixel into a broadband brightness signal Y and two narrowband color difference signals CB and CR, which are called 4: 4: 4 signal format or 4: 4: 4 signal mode. No matter what processing is done in the middle, the terminal needs to recover the Y, CB and CR signals in the format of 4: 4: 4 for each pixel, so as to get the corresponding three primary color component signals of R, G and B. In order to further save the transmission channel bandwidth, the digital TV system can only guarantee the bandwidth of the whole video signal for the brightness signal by using the characteristic that the vision is not as sensitive to the color details of the image as the brightness details, and narrow the bandwidth of the two color difference signals to half of the brightness signal bandwidth. Therefore, in the horizontal direction of the image, the sampling points of the two color difference signals CB and CR are reduced to half of the sampling points of the brightness signal Y. According to the standard, the sampling points of CB and CR overlap each other in space and correspond to the odd sampling points of the corresponding brightness signal. This signal format is called 4: 2: 2 signal format or 4: 2: 0 signal mode.
Question 5: What do sampling image, dot matrix image and bitmap image mean respectively? Images obtained by scanners, digital cameras and other devices are called sampling images, dot matrix images or bitmap images, hereinafter referred to as images.
Question 6: What does the ratio in the adaptive subdivision image sampler mean? 30 minutes 1. Adaptive Subdivision Sampler: It is the most used sampler, and it can achieve a balance between speed and quality for scenes that are vague and don't need much detail. In the production of indoor renderings, this sampler can be applied to almost all scenes.
2. Minimum ratio: Determine the minimum number of samples used by each pixel. A value of 0 means that one pixel uses one sample,-1 means that one sample is used for every two pixels, and -2 means that one sample is used for every four pixels. The larger the sampling value, the better the effect.
3. Maximum ratio, which determines the maximum number of samples used by each pixel. A value of 0 means that one pixel uses one sample, 1 means that four samples are used for each pixel, and 2 means that eight samples are used for each pixel. The larger the sampling value, the better the effect.
Usually the minimum ratio is-1 and the maximum subdivision is 2, which can get better results. If you want to get better quality, you can set the minimum scale to 0 and the maximum subdivision to 3, or set the minimum scale to 0 and the maximum subdivision to 2, but the rendering time will be long.
4. Color threshold: indicates the sensitivity difference of pixel brightness to sampling. The smaller the value, the better the effect and the longer the time. The higher the value, the worse the effect and the heavier the edge graininess. Generally, it can be set to 0. 1 to get clear and smooth effect. The color here refers to the gray scale of the color.
5. Random sampling number: Move the position of the sample slightly to get better results near the vertical line or horizontal line. Suggested inspection
6. Object contour: when selected, it means that the sampler will force high-quality supersampling at the edge of the object regardless of whether supersampling is required. Note that this option will not work when using depth of field or motion blur. Usually check
7. Normal direction: If checked, super sampling will achieve good results. Similarly, it will fail when using depth of field or motion blur. This item determines the sampling degree of adaptive subdivision in the normal of the object surface. When it reaches this point, it will stop judging the surface of the object. Specifically, it is to distinguish which areas intersect and which areas do not intersect, and it is generally set to 0.04.
Question 7: What does graduation photo Collection mean? It means to take some photos of you when you graduate. The purpose is to apply for your graduation certificate, handle relevant files and put them on file.
Question: What is the difference between Vray 3.4 image samplers? The larger the value, the finer the drawing, the less noise, and the corresponding rendering time will double. . . There is no fixed value, depending on personal needs. If it is an ordinary business chart, each value can be+1 by default.
Question 9: What do you mean by collecting and carving images of graduates? Significance of postgraduate image collection and sculpture;
Because this photo will be put on the diploma and can also be used as a resume photo, the meaning becomes unusual. Even Secretary Cai, who attends class on Friday, said that you can wear whatever you like. So I went back to the dormitory at noon and saw that the students in our class were basically busy changing clothes and making up.
I haven't bought a formal dress yet, and I haven't seen one that fits me well before I went to see it. I think I'll just wear a skirt. Anyway, sleeves are needed, and the skirt fully meets the requirements. But at this moment, seeing everyone like this, I dare not go out in my conference clothes. Fortunately, Yinyun helped me borrow one from my school sister, and the problem of clothes was solved.
Then there is the problem of makeup. I don't wear makeup, and I can't wear makeup. Want to ignore but don't want to be too casual. The other two in the dormitory reached out, trimmed their eyebrows slightly, sprayed toner to moisturize and then applied BB cream, eyeliner and lip gloss. After a while, it was finally done. Makeup is really troublesome. It's even more troublesome if you don't wear makeup. You still have to learn by yourself. You can't rely on others, what's more, it's a compulsory course for women.
* *br* * After the preparations are completed, we will go to the designated place to take photos. In fact, many classes didn't pay much attention to this photo shoot, which made our class stand out a bit, hehe, but this is our characteristic. But this is really cheating. Once I asked Huifei to pull my hair, but I just thought it would be softer, better looking and my face smaller. Who knows, the photographer said, "Show your eyebrows and ears and put your hair behind your back!" "
Question 10:2065 438+06 What does it mean that the collection of college students' images has been completed? You are about to graduate.