Scientia Silvae Sinicae ›› 2021, Vol. 57 ›› Issue (3): 98-107.doi: 10.11707/j.1001-7488.20210310
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Yan Zhou1,Wenping Liu1,*,Youqing Luo2,Shixiang Zong2
Received:
2019-10-17
Online:
2021-03-01
Published:
2021-04-07
Contact:
Wenping Liu
CLC Number:
Yan Zhou,Wenping Liu,Youqing Luo,Shixiang Zong. Small Object Detection for Infected Trees Based on the Deep Learning Method[J]. Scientia Silvae Sinicae, 2021, 57(3): 98-107.
Table 1
Main parameters of DJI Inspire2 UAV and X5S camera"
器材 Equipment | 参数 Parameters | 数值 Value |
DJI Inspire2无人机 DJI Inspire2 UAV | 长×宽×高 Length×width×height(mm) | 540×595×255 |
最大飞行高度 Maximum flight height/m | 2 500 | |
最大水平飞行速度 Maximum horizontal flight speed/(m·s-1) | 26 | |
最大飞行时间 Maximum flight time/min | ≈27 | |
DJI X5S云台相机 DJI X5S camera | 长×宽×高 Length×width×height(mm) | 140×98×132 |
传感器 Sensor | CMOS,4/3″ | |
图像分辨率 Image resolution/pixels | 5 280×3 956 |
Fig.1
Images in dataset and label file format < object> is each infected tree in images; < name> is class of the infected tree; < difficult> indicates whether the infected tree is a difficult sample, with 1 being yes and 0 being no; < bndbox> is coordinates of rectangular bounding box for the infected tree, and < xmin>, < ymin>, < xmax> and < ymax> are the horizontal and vertical coordinates of the upper left and lower right corner of the rectangular bounding box, respectively."
Table 3
Properties of feature maps and default boxes for base and enhanced prediction module"
特征图 Feature maps | 特征图大小 Size of feature maps | 默认框大小 Size of default boxes | 默认框生成步长 Stride of default boxes | 默认框长宽比 Length and width ratio of default boxes | 默认框数 Number of default boxes |
b1(e1) | 160×160 | 8(16) | 2(4) | 1 | 25 600 |
b2(e2) | 80×80 | 16(32) | 4(8) | 1 | 6 400 |
b3(e3) | 40×40 | 32(64) | 8(16) | 1 | 1 600 |
b4(e4) | 20×20 | 64(128) | 16(32) | 1 | 400 |
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