  This project aims to adopt preprocessing operations to get less distortions
for shadow image enlargement. The preprocessing operations consists of three
main steps: first enlarge the original shadow image by using any kind of
interpolation methods, second apply average filter to the enlargement image and
finally apply the unsharp filter to the previous averaged image. These
preprocessing operations leads to get an enlargement image very close to the
original enlarge image for the same shadow image. Then comparisons established
between the adopted image and original image by using different types of
interpolation and different alfa values for unsharp filter to reach the best
way which have less different errors between the two images.

Computer Vision and Pattern Recognition