Three dimensional printing

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Term explanation: stereoscopic printing

the principle of stereoscopic printing is to simulate the distance between human eyes, shoot from different angles, record the left and right pixels on the photosensitive material, and when viewing, the left eye sees the left pixel and the right eye sees the right pixel. The printed matter produced according to this principle is called stereoscopic printing

stereo printing has the following characteristics:

(1) it can reproduce objects realistically and has a strong sense of three-dimensional. The product image is clear, the level is rich, the image is lifelike, and the artistic conception is profound

(2) the originals of three-dimensional printing are often made of modeling design or scenery shooting, and the printed matter is generally printed on high-quality coated paper and high-temperature resistant ink, so it has good gloss, bright color and is not easy to fade

(3) the surface of the printed product is covered with a layer of concave convex cylindrical mirror grating plate, which can directly view the three-dimensional effect of the panoramic picture

in terms of people's stereovision of objects, stereovision of objects mainly comes from people's physiological factors, experience and psychological factors. In fact, stereoscopic vision is the stereoscopic information formed by integrating these complex factors in the visual process. In terms of physiological factors, there are how to use the impact testing machine. The sample impacted by the impact testing machine has sharp time difference (binocular parallax and monocular motion parallax), convergence, adjustment, etc. Specifically, binocular parallax is the fundamental factor for people to obtain stereo vision, that is, in daily life, when people observe objects, due to the angle of view between the two eyes and other reasons, the object images seen by the left and right eyes will be different, that is, parallax, which gives people a sense of three-dimensional

the effect of stereoscopic images must be reflected by display technology. The stereoscopic display mentioned here refers to the reproduction of stereoscopic information in the three-dimensional space of an image, which is another basic condition for obtaining stereoscopic vision. There are mainly two methods to realize stereoscopic display, namely, two-way display method and multi-way display method

(1) two-way display method. It can be divided into stereoscopic method, two-color filter method, polarizing filter method and alternating segmentation method. No chiller): the overload thermal relay (protecting the blower and chiller from overload) uses the parallax of two eyes to observe the image respectively to obtain stereo vision. Stereoscopic method: the basic principle of stereoscopic method is to use stereoscope to observe the left and right graphics to form a stereoscopic sense. This method has been widely used since it appeared in the 19th century. The surface of the friction wheel in a gearbox must not be oiled or splashed with oil, but a special stereoscope must be used, otherwise there will be no stereoscopic vision. Two color filter method: the left and right images are printed in the same plane with red and blue inks respectively, and the printed images are observed through the red and blue filters. Because the color filter and ink are complementary to each other, the image observed through the color filter is not red and blue, but black. Therefore, this method is limited to black-and-white photos and is not suitable for color printing. Coupled with different wavelengths of light entering the two eyes, it is easy to make the eyes tired. Therefore, this method is rarely used except for making aerial maps. Polarizing filter method: project the left and right images on the same plane through mutually orthogonal polarizing filters, and observe the left and right eyes with the same polarizing filters. Although this method requires special glasses, it has been widely used in stereoscopic movies and stereoscopic TVs. Alternate segmentation method: the left and right images are alternately presented on the same plane, and the unnecessary parts in the same period are covered, so as to produce a three-dimensional sense. Because the residual image effect will cause flash, the price of glasses for shielding is high, and generally speaking, the gap between trapezoidal screw is relatively large, so this method has not been popularized so far

(2) multidirectional display method. There are mainly parallax shielding method and cylindrical lens method. Parallax shielding method: parallax shielding method, also known as parallax slit method, was invented by es in 1930. Its working principle is to segment the left eye image and the right eye image by the slit, expose them on the film, and then develop, print and print. If it is placed in the same position when photographing, and the two eyes are also placed in the position where the image is placed, the stereoscopic image can be seen. Using the parallax slit method, if the two images are synthesized, the parallax stereo image can be obtained. If the aperture ratio of the slit is reduced, the synthesis of multiple images can be completed, and the parallax panoramic image can be obtained. In essence, the parallax slit method is inevitable to reduce the amount of light

therefore, it is rarely used except in cylindrical lens photography. Cylindrical lens method: cylindrical lens can be regarded as a lens plate composed of many convex lens sheets side by side, which has the function of image division. The back of this lens coincides with the focal plane. Due to the image splitting effect of the lens, the images a, B, C and D in each direction can be separated into a, B, C and D and recorded on the focal plane. As long as the left and right eyes are placed at the positions of B and C, the stereoscopic image can be seen

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