RECTIFIED  PHOTOGRAPHY

Rectified Photography is a technique for removing optical and perspective distortion from photographic images. The rectified images may then be used to create large mosaic images or to extract scaled measurements. 

Traditional rectified photography is both time consuming and expensive due to the equipment required and the need to obtain detailed measurements of control points for each image.

Digital photography combined with photogrammetric techniques enable significant savings of time and cost to be achieved and provide images in a medium which can readily be utilised by other software tools.

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For rapid photo-imaging surveys, three views are taken of the subject. Ideally these cover an angular range of 90 degrees, however where visual obstructions prevent this reduced angles can be utilised.

Eygliers Gate, Fort Dauphin, Haute Alpes, France

Photogrammetric processing is used to orientate the images relative to each other and to correct perspective distortion. The best image, normally the front view, is then processed to produce a rectified image.