About 2D Photogrammetry

HighDesign Pro provides a powerful, single-image photogrammetry tool to obtain the actual projection of the architectonic elements captured in a picture: this function can be used for surveys of architectural façades and any planar surface and it only needs a normal camera and two measures. No specific equipment nor knowledge is required.

Photogrammetry in HighDesign offers two tool methods: 

• Image Correction: transforms the original image by rectifying the perspective deformation 
• Perspective Tracing: creates a corrected projection by tracing the elements in the image after the internal geometry of the image has been set up. All projections are vector-based. 

The following are some requirements and suggestions to obtain the best results: 

• The image must include at least two horizontal and two vertical items (e.g. a door, a window, wall bricks) and, if available but not strictly required, two items with the third dimension. These requirements are the only really needed to use the photogrammetry tool in HighDesign. 
• If possible, avoid too angled views because the projection could be deformed on the edges of the image; 
• For the same reason as above, avoid fisheye lenses (<28 mm); 
• The image should include at least one horizontal and one vertical dimension; however, if you do not have those dimension, you can set up the projection with any dimension and later resize the resulting drawing. 

As a rule of thumb, make sure the image includes some reference items and it has not been clipped or deformed. When the third direction (depth) is not available, the internal geometry of the view relies on the diagonals of the picture’s rectangle, hence the importance of preserving the original shape of the picture.