Automatic Thresholding of Tree Crown Images

スポンサーリンク

概要

• 論文の詳細を見る

• Image analysis of tree crown images may provide more objective measures of crown condition which has been assessed visually in the forest health monitoring of many countries, but the commonly used interactive thresholding approach is too time-consuming to apply to large numbers of images. This study examined the usefulness of three automatic thresholding algorithms that are based on the between-class variance (VARIANCE), the classification error and the total entropy, respectively. VARIANCE had no significant difference from, and good correlation (r=0.992) with, interactive thresholding for the black pixel percentage within a region of interest, but the other two did not. VARIANCE also had high correlation (r=0.992) of the black pixel percentage between cloudy and blue sky conditions. It was concluded that VARIANCE can be successfully used for thresholding for tree crown images and can greatly reduce time for image processing, while maintaining a high level of accuracy and reproducibility. However, we need to pay attention to the quality of the original color images.

• 森林計画学会の論文

著者

• Inoue Akio

  Faculty Of Agriculture Tottori University

• Mizoue Nobuya

  Faculty Of Agriculture Kyushu University

• Mizoue Nobuya

  Faculty Of Agriculture Miyazaki University

関連論文

• Effects of light and microsite conditions on tree size of 6-year-old Cryptomeria japonica planted in a group selection opening
• Effects of residual trees on tree height of 18- and 19-year-old Cryptomeria japonica planted in group selection openings
• Differences in spectral trajectory with stand volume development between Japanese larch and Japanese oak in Hokkaido, Japan
• Object-based forest biomass estimation using Landsat ETM+ in Kampong Thom Province, Cambodia
• Estimation of stand volumes using the k-nearest neighbors method in Kyushu, Japan
• Relationships of culm surface area to other culm dimensions for bamboo, Phyllostachys pubescens
• Stand Dynamics of Tropical Seasonal Evergreen Forest in Central Cambodia
• Positional Accuracy of National Forest Inventory Plots in Japan
• Monitoring Deforestation and Forest Degradation in the Bago Mountain Area, Myanmar using FCD Mapper
• Fourier Transform Analysis of Very High Resolution Remote Sensed Imagery Shows Potential for Estimating Stand Density of Regular-spaced Planted Forests
• Effect of settings of digital fisheye photography to estimate relative illuminance within forest under low light conditions
• Management System for Japanese Oak on the Kyushu University Forest in Hokkaido : Experiment for the 30-year Period
• Monitoring Survival Rates of Young Plantation Trees in Mountainous Regions in Japan using LANDSAT TM Data
• Estimation of Relative Illuminance in Forests using Hemispherical Photographs
• Factors Affecting Deforestation in Paunglaung Watershed, Myanmar using Remote Sensing and GIS
• Forest Stratification and Species Diversity of Cryptomeria japonica Natural Forests on Yakushima
• Estimation of Relative Iilluminance using Digital Hemispherical Photography
• Automatic Thresholding of Tree Crown Images
• Regeneration Process after Clear-cutting of a Secondary Abies and Tsuga Forest in Kirishima, Southwest Japan
• Analysis of the Height-diameter Curve of Japanese Cedar Even-aged Pure Forest Stands Using an Allometric Equation : A Simple Method of Estimating Coefficients of the Equation
• Woodfuel Consumption Rates and Flow in Kampong Thom Province, Cambodia
• Influence of using texture information in remote sensed data on the accuracy of forest type classification at different levels of spatial resolution
• Can the Relative Stem Taper Curve be Estimated Theoretically only from Tree Height and Diameter at Breast Height?
• Fractal Analysis of Tree Crown Images in Relation to Crown Transparency

もっと見る 閉じる

スポンサーリンク