[6] [6] Kittler J. On the accuracy of the sobel edge detector［J］. Image and Vision Computing,1983,1(1):37-42.

[7] [7] Marr D, Hildreth E. Theory of edge detection. Proceedings of the Royal Society of London［J］. Series B: Biological Sciences,1980,207(1167):187-217.

[8] [8] Canny J. A computational approach to edge detection［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence,1986,8(6):679-698.

[9] [9] Torre V, Poggio T A. On edge detection［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence,1986,(2):147-163.

[10] [10] Krizhevsky A, Sutskever I, Hinton G E. Imagenet classification with deep convolutional neural networks［C］∥ Proceedings of the 2012 Conference and Workshop on Neural Information Processing Systems. Doha, Lake Tahoe: NIPS,2012:1097-1105.

[11] [11] Bertasius G, Shi J, Torresani L. DeepEdge: a multi-scale bifurcated deep network for top-down contour detection［C］ ∥ Proceedings of The 2015 IEEE Conference on Computer Vision and Pattern Recognition. USA, Piscataway,NJ:IEEE,2015:4380-4389.

[12] [12] Xie S, Tu Z. Holistically-nested edge detection［J］. International Journal of Computer Vision,2017,125( 1 /2 /3):3-18.

[13] [13] Shelhamer E, Long J, Darrell T. Fully convolutional networks for semantic segmentation［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence,2017,39( 4):640-651.

[14] [14] Lee C Y, Xie S, Gallagher P, et al. Deeply-supervised nets［EB /OL］.［2019-01-02］. https: / /arxiv. org / pdf /1409. 5185. Pdf.

[15] [15] Liu Y, Lew M S. Learning relaxed deep supervision for better edge detection［C］∥ Proceedings of the 2016 IEEE Conference on Computer Vision and Pattern Recognition. Las Vegas, Piscataway: IEEE,2016:231-24.

[16] [16] Liu Y, Cheng M M, Hu X W, et al. Richer convolutional features for edge detection［C］∥ Proceedings of the 2017 IEEE Computer Society Conference on Computer Vision and Pattern Recognition.Hawaii, Piscataway: IEEE,2017:3000-3009.

[17] [17] Yu F, Koltun V. Multi-scale context aggregation by dilated con volutions［EB/OL］.［2019-03-02］. https: ∥arxiv. org/pdf/ 1511. 07122. pdf.

[18] [18] Deng R X, Shen C H. Learning to predict crisp boundaries［C］∥ Proceedings of the 2016 European Conference on Computer Vision. Amsterdam,Cham:Springer,2018:1-1.

[19] [19] Dolla'r P, Zitnick C L. Fast edge detection using structured forests［J］. IEEE Transactions on Pattern Analysis and Machine Intelligence,2015,37( 8):1558-1570.