Convert Perspective picture to Ortho picture for CAD

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Discussion Overview

The discussion revolves around the challenge of converting a perspective image of a 3D object into an orthogonal representation suitable for CAD applications. Participants explore methods for achieving this conversion and the implications of different dimensional representations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks a method to convert a 3D perspective image into an orthogonal format for tracing in CAD.
  • Another participant questions whether the desired output is a 2D or 3D orthogonal image, noting the importance of specifying dimensions for the mapping process.
  • A participant clarifies that the image is a 2D projection of a 3D world, which may aid in understanding the conversion process.
  • Further inquiry is made about the number of perspective images available and whether the object has geometric symmetry that could assist in reconstructing the third dimension.
  • One participant confirms the goal is to create a 3D orthogonal CAD object from a geometric object, stating they can take multiple pictures as needed.
  • A suggestion is made to explore resources on 3D reconstruction and photogrammetry for potential solutions.

Areas of Agreement / Disagreement

Participants express varying views on the specifics of the conversion process, including the dimensionality of the output and the methods to achieve it. No consensus is reached on a definitive approach or solution.

Contextual Notes

The discussion highlights limitations in specifying the exact nature of the conversion and the assumptions regarding the geometric properties of the object being modeled.

SSGD
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I want to take a picture of an object. Then import the image into cad. And trace it. The issue I am having is the picture from the camera is a 3D perspective image. So it is impossible for me to trace in CAD.

Is there a way to convert an image from perspective to orthogonal? Or create a coordinate system in cad that is perspective instead of orthogonal.
 
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SSGD said:
Is there a way to convert an image from perspective to orthogonal?
I assume you have a 2D picture of a 3D world, with a perspective vanishing point that can be located in 2D. Do you want a 2D orthogonal or a 3D orthogonal image?

SSGD said:
Or create a coordinate system in cad that is perspective instead of orthogonal.
Unless you specify the number of dimensions it is difficult to work out what mapping you are trying to perform.
A 3D orthogonal coordinate system from cad could be used to generate a 2D perspective drawing if you specified a viewpoint.
 
Well, the image is of a 3D world, but if I import the image into CAD it would be a projection onto the XY Plane. So I would say it is a 2D projection. If this helps. The image is a normal camera picture.
 
So you want to convert a 2D perspective image of a 3D object to an orthoganal CAD object.
But do you want to convert that to a 2D or a 3D orthogonal CAD object ?

How many perspective 2D images do you have from different viewpoints of the one original 3D object ?
Does the imaged object have some geometric symmetry that could be used to regenerate a missing third dimension ?
 
I need to convert it into a 3D orthogonal CAD object. The object is geometric. It is simply but to recreate it would take lot of measurements. I can take as many pictures as I need.
 

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