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。
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。
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.
联合使用车底阴影、边缘信息、轮廓对称、灰度对称、水平线对称等车辆先验知识，提出一种基于特征的车辆检测方法。
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