Canopy gap fraction is one of the important parameters of leaf area index calculation,playing a crucial role in evaluating canopy growth.In this paper,MATLAB is applied to analyze hemispherical photographs to obtain reasonable values of canopy gap fraction.After extracting the single color component,the photographs are segmented to get effective area,then information of every pixel is extracted and calculated to get values of canopy gap fraction through using improved OTSU algorithms.By contrasting values of canopy gap fraction with processing results of Winscanopy,it can draw a conclusion that correlation of both sides is very high.The proposed calculation method opens up new avenues for effectively getting canopy gap fraction.
SONG Wenlong
,
GUO Hui
,
SONG Jiayin
,
ZHU Liangkuan
. Extraction of Forest Canopy Porosity Based on Improved OTSU Algorithm[J]. Forest and Grassland Resources Research, 2015
, 0(1)
: 134
-138
.
DOI: 10.13466/j.cnki.lyzygl.2015.01.024
[1]彭焕华,赵传燕.利用半球图像提取植被冠层结构特征参数[J].生态学报,2011,31(12):3376-3383.
[2]张丽敏,王丽华,殷红.一种半球图像的处理方法[J].辽宁林业科技,2006,3(4):16-19.
[3]C Macfarlane,S K Arndt,S J Livesley.Estimation of leaf area index in eucalypt forest with vertical foliage,using cover and fullframe fisheye photography[J].Forest Ecology and Management,2007,242(8):756-763.
[4]冈萨雷斯.数字图像处理[M].3版.北京:电子工业出版社,2011.
[5]张雪峰.图像阈值分割技术中的部分和算法综述[J].西安邮电学院学报,2011(5):1-5.
[6]韩思齐,王蕾.图像分割的阈值法综述[J].系统工程与电子技术,2006,6(4):91-94.
[7]姚敏.数字图像处理[M].北京:机械工业出版社,2006.
[8]陈书海.实用数字图像处理[M].北京:科学出版社,2005.
