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With the widespread use of aerial digital cameras such as the DMC,ADS40,RMK-D,and UltraCamD, high dynamic range imaging is generally expected for generating minuteness orthophotos in digital aerial photogrammetry.However,high dynamic range images(12-bit,4,096 gray levels)are generally compressed into an 8-bit depth digital image(256 gray levels)owing to huge amount of data and interface with peripherals such as monitors and printers.This means that a great deal of image data is eliminated from the original image,and this introduces a new shadow problem.In particular,the influence of shadows in urban areas causes serious problems for generating minuteness orthophotos and performing house detection.In order to resolve the shadow problem in digital aerial photogrammetry,shadow areas should be recognized and corrected automatically without the loss of luminance information.With this motive,a practical shadow correction method for 8-bit depth digital image which is derived from 12-bit real data of DMC is investigated in this paper.

Shadow Correction in High Dynamic Range Images by Aerial Digital camera