Shadow Removal Techniques for Traffic Applications Sample Clauses

Shadow Removal Techniques for Traffic Applications. The majority of research on removal of shadows from images has been performed in the fields of computer science and electrical engineering. One of the earliest investigations in shadow removal was done by Xxxxxxx et al. (1990). They split an image into square blocks and produced an image based on the mean intensity of each block. The median intensity of the mean values was then used as a basis for scaling all blocks below the median to the median value. The authors noted that this method is appropriate only for images where the objects of interest occupy the higher end of the intensity range. Thus, the method would not be suited for situations in which the objects of interest occupy the lower end of the intensity range (Xxxx et al., 2002). This method also introduces some loss of contrast and tends to cause “blocking” (Xxxx et al., 2004).