摘要
为了定量描述仿球形水果表面轮廓间的差异,用周长-面积法研究水果的分形维数特征.取大小不同的温州蜜柑20个、麻阳冰糖橙17个和红富士苹果18个,设置3种水果花萼面和侧面2个方向上数字图像红色或蓝色分量阈值,将水果区域内外的红色、绿色、蓝色分量分别置为0和1,得到水果二值图像.以水果区域细化后的边界像素数和区域内像素数分别作为水果的周长和面积,以周长-面积法求得3类水果2个方向的分形维数.结果表明,3种水果花萼面的分形维数均比其侧面的分形维数小,花萼面分形维数间差异不明显,但侧面分形维数差异明显,表明仿球形水果的外形特征可用花萼面分形维数和侧面分形维数反映,但主要指标是侧面分形维数.
Quantitative description about difference in contours of paraspherical fruits was conducted with fractal dimension using perimeter-area method. Test sample sets are 20 Wenzhou mandarin oranges, 17 Mayang bingtang oranges and 18 red fuji apples. Threshold values of red or blue component of fruit calyx and profile image are used to convert the image to binary image. Red, green and blue components within/out of fruit region are set to 0/1. After boundary thinning, pixel numbers of boundary and fruit region are treated as perimeter and area of fruit region. Fractal dimensions of calyx and profile of three kinds of fruits are calculated with perimeter-area method. Test results show fractal dimension of calyx images is smallest among three kinds of fruits in two directions, and deviation of calyx is not significant between different fruits; fractal dimension varies significantly in profile images. In conclusion, the shape feature of paraspherical fruit can be described by fractal dimension especially fractal dimension of profile.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期478-482,共5页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省自然科学基金项目(2007JJ6129)
湖南省农业厅重点项目(200704A)
关键词
仿球形水果
图像
分形维数
周长-面积法
paraspherical fruit
image processing
fractal dimension
perimeter-area method
