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Solutions

 


Aerial images taken from aircrafts present often big jumps caused by the aircraft vibrations and quick movements, which often make them not suitable neither for a relaxing human inspection nor for automatic visual analysis. This problem can be solved by preprocessing the images, so that every new frame is matched with previous one and warped in order to obtain a stable image sequence.

 

      

 

 


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 www.flyviews.com

 Porto (Portugal) panoramic view