Another interesting application for calibrated image sequences is image editing. Consider the case where we want to take a photograph of a building which is obscured by a number of trees or a road sign. If a number of images were available from other viewpoints, and the model of the building was known, then the area obscured by the tree or road sign could be rendered using information from the other images. This requires both a knowledge of the camera geometry and the model of the obscured objects.
In the following example a calibration grid is obscured by some wooden blocks. The projection matrices of six images were recovered using the non-linear technique presented in this paper. The geometry of the image segments was entered manually using equation 22. The original and rendered images are shown below:
