Computer Vision: Models, Learning, and Inference by Simon J. D. Prince

Author:Simon J. D. Prince
Language: eng
Format: epub, pdf
Tags: ebook
Publisher: Cambridge University Press
Published: 2012-06-20T16:00:00+00:00

where x,y,u,v, and w are measured in the same real-world units (e.g., mm).

14.1.2 Focal length parameters

The normalized camera is unrealistic; for one thing, in a real camera, there is no particular reason why the focal length should be one. Moreover, the final position in the image is measured in pixels, not physical distance, and so the model must take into account the photoreceptor spacing. Both of these factors have the effect of changing the mapping between points w = [u,v,w]T in the 3D world and their 2D positions x = [x,y]T in the image plane by a constant scaling factor (Figure 14.5) so that

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