倾斜摄影测量生成的原始正射影像存在灰度集中和局部亮度值过大等情况，对图

Photogrammetry generated raw inclined ortho concentrated and the gradation luminance value local video, etc. is too large, the spatial domain of the image made gray linear stretching, increases the variance of the background crown ground, and to facilitate subsequent classification of individual tree crown division; using the nearest neighbor classification classification crown and the images are classified into two types of ground, excluding the impact of the split background values ​​may arise. Image enhancement and classification results shown in Figure 4:

倾斜摄影测量生成的原始正射影像存在灰度集中和局部亮度值过大等情况，对图像做了空间域灰度线性拉伸，增加了树冠与地面背景的差异，便于后续分类和单木树冠分割；使用最近邻分类分类方法将图像分类为树冠和地面两类，排除背景值对分割可能产生的影响。图像增强和分类结果见图4：

The original Orthophoto Image generated by tilt photogrammetry has the situation of gray concentration and local brightness value is too large. The gray linear stretch of spatial domain is made to the image, which increases the difference between the crown and the ground background, so as to facilitate the subsequent classification and the single tree crown segmentation. The image is classified into two categories: the crown and the ground by the nearest neighbor classification method, so as to eliminate the possible influence of the background value on the segmentation 。 The results of image enhancement and classification are shown in Figure 4: