Complex Texture Contour Feature Extraction of Cracks in Timber Structures of Ancient Architecture Based on YOLO Algorithm

Table 1

Key national preservation units of cultural relics.

Date	Batch number	Type one	Type two	Type three	Type four	Type five	Type six	Total
1961.03.04	One	33	-	25	77	26	19	180
1982.02.23	Two	10	-	7	28	10	7	62
1988.01.13	Three	41	-	28	111	49	29	258
1996.11.20	Four	-	50	12	110	56	22	250
2001.06.25	Five	-	40	36	248	144	50	518
2006.05.25	Six	-	206	64	513	220	77	1080
2013.05.03	Seven	-	329	117	795	516	186	1943
2019.10.16	Eight	-	234	51	280	167	30	762
Sum		84	859	340	2162	1188	420	5058