Implementing a cad system to reduce

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Implementing a cad system to reduce

The 3D reconstruction of objects is a generally scientific problem and core technology of a wide variety of fields, such as Computer Aided Geometric Design CAGDComputer GraphicsComputer AnimationComputer Visionmedical imagingcomputational scienceVirtual Realitydigital mediaetc.

For instance, the lesion information of the patients can be presented in 3D on the computer, which offers a new and accurate approach in diagnosis and thus has vital clinical value.

Get In Touch InAutodesk released a white paper entitled "Building Information Modeling," [8] and other software vendors also started to assert their involvement in the field.
Some of the benefits this approach offers: These models typically appear on a computer monitor as a three-dimensional representation of a part or a system of parts, which can be readily altered by changing relevant parameters. CAD systems enable designers to view objects under a wide variety of representations and to test these objects by simulating real-world conditions.
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INTEROPERABILITY TOOLKITS Digital simulations, such as this one for Apollo 17which include the pad-load data needed for the simulation though not necessarily identical to what was needed for the actual mission. However, below are various related and sometimes overlapping supplemental materials that have not or not yet been integrated into the electro-mechanical page:

These methods actively interfere with the reconstructed object, either mechanically or radiometrically using rangefindersin order to acquire the depth map, e. A simple example of a mechanical method would use a depth gauge to measure a distance to a rotating object put on a turntable.

More applicable radiometric methods emit radiance towards the object and then measure its reflected part. Examples range from moving light sources, colored visible light, time-of-flight lasers to microwaves or ultrasound.

See 3D scanning for more details. Passive methods[ edit ] Passive methods of 3D reconstruction do not interfere with the reconstructed object; they only use a sensor to measure the radiance reflected or emitted by the object's surface to infer its 3D structure through image understanding.

In this case we talk about image-based reconstruction and the output is a 3D model. By comparison to active methods, passive methods can be applied to a wider range of situations. Monocular cues methods[ edit ] Monocular cues methods refer to use image one, two or more from one viewpoint camera to proceed 3D construction.

It makes use of 2D characteristics e. Technically, it avoids stereo correspondence, which is fairly complex. Generating and reconstructing 3D shapes from single or multi-view depth maps or silhouettes [5] Shape-from-shading Due to the analysis of the shade information in the image, by using Lambertian reflectancethe depth of normal information of the object surface is restored to reconstruct.

Images taken in different lighting conditions are used to solve the depth information. It is worth mentioning that more than one image is required by this approach. Distortion and perspective measured in 2D images provide the hint for inversely solving depth of normal information of the object surface.

Images of an object acquired by two cameras simultaneously in different viewing anglesor by one single camera at different time in different viewing angles, are used to restore its 3D geometric information and reconstruct its 3D profile and location. This is more direct than Monocular methods such as shape-from-shading.

Binocular stereo vision method requires two identical cameras with parallel optical axis to observe one same object, acquiring two images from different points of view. In terms of trigonometry relations, depth information can be calculated from disparity. Binocular stereo vision method is well developed and stably contributes to favorable 3D reconstruction, leading to a better performance when compared to other 3D construction.

Unfortunately, it is computationally intensive, besides it performs rather poorly when baseline distance is large. However, to simplify the calculation, images are drawn in front of the optical center of the lens by f.

Implementing a cad system to reduce

Suppose such world point P whose corresponding image points are P1 u1,v1 and P2 u2,v2 respectively on the left and right image plane. Assume two cameras are in the same plane, then y-coordinates of P1 and P2 are identical, i. According to trigonometry relations, u.In computer vision and computer graphics, 3D reconstruction is the process of capturing the shape and appearance of real objects.

This process can be accomplished either by active or passive methods. If the model is allowed to change its shape in time, this is referred to as non-rigid or spatio-temporal reconstruction.

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