Study surveys on tree image extraction in a complex background

Tree image extraction is an approach to separate an object tree from its surrounding landscape in a photograph,for the purpose of providing basic data and technical support for the application of computer technology in forestry.The uncertainty and complexity of the background in a photograph shot in a natural environment make the extraction of tree images challenging.We analyzed the issues and difficulties of tree image extraction in a complex background.The extraction methods are divided into two groups,i.e.image segmentation and natural image matting.We expound on these two methods and discuss their advantages and limitations.A combination of these two methods could become a suitable approach to the extraction of tree images.The development of an accurate,rapid and real-time tree image extraction technology is the focus in future research.