• Small hole camera mode
The first is the operating principle of this camera:
Even though there are more complex camera models in use in computer graphics, pinhole imaging is still very popular, after all, it is simple and versatile.
• Pixels and light
When we generate an image, we basically have to decide what color to put in each pixel. You can imagine that each pixel is an independent small window in the scene. "If only one color can be selected to represent each color passing through this window, then the correct color should be?" 3D computer graphics is dedicated to answering the above questions.
One way of thinking about this problem is based on a small hole camera. If we can associate the image area with a given pixel, then we can learn what will happen to the image area in the real physical environment, and then use this The case is used as a navigation to determine the corresponding real pixels in the virtual world of the computer. If the small hole model in Figure 3 is used, the correspondence is very simple.
In Figure 4, a specific and corresponding pixel is isolated on the film, and a beam of light is separated from the scene and punched on the film through the small hole. After the exposure and the small hole are covered, the area in the film is absorbed Many different rays of light. If we want to make each incident beam correspond to a color one-to-one, we should perform an "average" operation.
From the discussion in this section, we can see that our ultimate goal is to get the correct color for each pixel pair. From now on, when we refer to the "small hole camera model" or even the "camera", we refer to Figure 3.
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