Select the "smudge" tool and set the strength to 92%. Slightly smudge the edge of the shadows not touching the building.
选择“涂抹”工具，设置强度为92%，轻轻涂抹阴影的边缘，注意不要触及到建筑。
2
If we consider light from the point of view of geometrical optics, we would expect sharp, well-defined shadows to appear behind the edge of an opaque obstacle.
从几何光学的观点出发，我们预期在不透明障碍物边缘的后面将得到明显清晰的阴影。
3
Prior knowledge of the vehicles, such as shadows underneath the vehicles, rich edge information, contour symmetry, gray level symmetry, horizontal line symmetry and etc, is combined.