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Orthophotos & Mosaicing

The images taken from an aircraft can be assembled together in order to obtain a huge image composed of pieces of the original images. For this propose every single image have to be referenced to the same coordinate system, that implies an accurate matching and calculation of the point of view of every single image. The accumulative error can be solved when the aircraft returns to take images of previous visited places, then the whole calculation is updated so that the new images of the revisited placed match the previous ones.

This matching can be further exploit in order to obtain sub-pixel accuracy of the composed image, since different images of the same object take slightly different visual information that can be used for reducing the pixel size and therefore increasing the visual resolution.



Galician Coast. Aerial images from

 Porto (Portugal) panoramic view