机器学习方法
HED(Holistically-Nested Edge Detection)整体嵌套边缘检测<br>
RCF（Richer Convolutional Features）丰富卷积边缘检测<br>
BDCN（Boundary Detection Network）边界检测网络<br>
PiDiNet 高效边缘检测的像素差异网络
DSCD（Deep Structural Contour Detection）深度结构轮廓检测
EDTER（Edge Detection via a Two-Branch Network）通过双分支网络进行边缘检测
