Photographic ways to get rectify image:
1. Get to the right Viewpoint
The easiest way to take rectify image is:
To point the lens axes perpendicular to the center of the object's plane.
Or with other words:
To keep film's plane parallel to the object's plane.
If the object is too large (the distance between the camera and the object is not sufficient) the field has to be divided to couple of sectors and assembled to complete image after taking rectify picture of each sector.

2. Optical rectification (perspective correction)
There is a possibility to rectify the photograph by using special kind perspective correction (shift) lenses (1) or view camera (2). There is also possibility to do that in the B&W lab with special enlarger.
The principle is the same: The film's plane is parallel to the object's plane but the lens axes isn't pointed to the object's center. A limited perspective correction could be done with shifting the front plane of the lens toward the object's center (3).


1 2 3

3. Digital rectification
This is rectification with computer using software for raster image processing like: Photo Shop, Corel Photo Paint, and AutoCAD applications.

SEE EXAMPLE OF THE ASSEMBLING PROCESS

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