Capture your favourite image
I. You are going to read an article about 3D Scanners.
Decide which statement (1-5) is True, False or Not Given.
D SСANNERS
By definition, 3D scanners are devices that can capture images from real life to a digital format. These scanners are much different than other similar devices that can perform real life captures, like the digital cameras, for example. The basic difference is that the 3D scanners can capture relief in the images quite well. Upon observing an image that has been produced through 3D scanning, it is very apparent which object is placed in front and which is behind, for instance. There is tremendous detail in lighting and shadows and the colors produced are much more true-to-life than those produced through other similar devices.
How do 3D Scanners work?
Basically, the technology of a 3D scanner is the same as that of a digital camera, though the scanner is much more advanced in comparison with the camera. Like a camera, the 3D scanner produces a field of vision in front of it and captures the images that lie in this field. But the 3D scanner is much more advanced at understanding relief. This it does by using complicated vector equations. All the points that are present in the field of vision of the scanner are provided vector parameters. Points that are closer to the camera will be given closer coordinates than the points that are farther. The light that will fall on each point will depend on the vector coordinate of the point. In this manner, when the final image is obtained, the image has the 3D relief that is required.
What are the types of 3D Scanners available?
There are two main types of 3D scanners available – the noncontact 3D scanners and the contact 3D scanners.
Noncontact 3D Scanners – these scanners are usually mounted on a stand. Their principle of working involves emittingsome kind of radiation, such as light, X-rays, ultrasound or laser, over the area to the scanned. They then allocate the vector coordinates to every point in the area and then take an authentic picture of them. Technology has advanced in these noncontact 3D scanners nowadays. There are special types available in which the scanners themselves do not produce any radiation, but only decipher the information reflected back through the ambient light present in the area.
Contact 3D Scanners – these are also known as Coordinate Measuring Machines (CMMs). The CMMs, as their name suggest, have to be placed in contact with the object that needs to be scanned. They will physically feel all the points and bring out a scanned 3D image of it. These scanners are highly precise in their images, but they have their limitations. Not all objects can be allowed to come into contact with the scanner. It becomes a difficulty when scanning liquids or glass objects. Even most museums will not appreciate the scanner coming so close to their artifacts. Also, because of the physical preparedness of the device that's required, such scanning becomes very slow.
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Why use 3D Scanning?
Apart from that, 3D scanned images are used in a large number of applications. One important use of this technology is in reverse engineering, a method in which deep analysis is done into an engineering model to better understand its working. There is a lot of use made of 3D scanned images in building computer graphics, especially for video games, and for the graphics used in movies. Museums use 3D scanners for recording their artifacts, and use the same images for promotional purposes, such as when popularizing an auction for the artifact.
How are 3D Scanners priced?
As expected, 3D scanners are very highly priced. Prices can start from $40,000 and can go on up to $400,000. Included in the packages of 3D scanners are the special software application that is needed for using all features of the scanner, tutorials and maintenance tips and certain technologies that can be implemented on the scanner.
1. 3D scanners are quite affordable and thus have become a household item.
2. There is no particular difference between 3D scanners and other similar devices.
3. 3D scanning presupposes deep analysis of the object.
4. Not all objects can be scanned by noncontact 3D scanners.
5. 3D scanners are as sophisticated as digital cameras.
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