An algorithm for extracting inner and outer contours of korean dress images

doi:10.19398/j.att.202103004

Abstract

Abstract:

In order to achieve the informatization of the styles of traditionalKorean dresses, this paper extracts the inner and outer contours ofKorean dress images respectively, in view of the characteristics ofKorean dresses, that is, A-shaped contour with high waist and large hemline and similar color collocation in dress. During the recognition of outer contour, the outer contour is extracted using the linear structure morphology algorithm of angle θ and length c, and the effect of two factors was evaluated in an objective way through a binary variance analysis. Combined with the subjective visual effect, the optimal combined parameters for outer contour were obtained: θ=10°, c=9. For the recognition of inner contours of accessories with low contrast, a CLAHE algorithm was designed to enhance image. Secondly, K-means clustering algorithm was adopted to segment the collar image, and then rectangular assignment and local zoom repair algorithm based on interpolation were adopted for filling and repairing. Finally, Canny algorithm was used to extract contours and get the inner contour of collar. The experimental results indicate that the extraction method integrating inner and outer contours can achieve the best effect under subjective vision and objective evaluation of boundary length. It is an effective algorithm for the characteristics ofKorean dress images.

Key words: Korean dress, image recognition, linear structure morphology, CLAHE, K-Means

摘要：

为了实现韩国传统礼服款式的信息化,针对韩国礼服高腰大摆的A字廓型和服饰用色搭配较相近的特点,对韩国礼服图像采用了内外廓型分别提取的方法。在外轮廓识别中,采用角度θ和长度c交叉的线形结构形态学算法进行外轮廓提取,并通过二元方差分析对双因子的影响结果进行客观评价,结合主观视觉效果,得出最优外轮廓的组合参数θ=10°,c=9;对于对比度较低的内部饰品轮廓识别,设计CLAHE算法进行图像增强,采用K-Means聚类算法进行领饰图像分割,再用矩形法赋值和基于插值的局部放大修复算法进行填充修复,最后用canny算法进行轮廓提取得出内部领饰轮廓图。结果表明:内外组合的轮廓提取算法可达到主观视觉和客观边界长度评价下的最优效果,是适合韩国礼服图像特点的有效算法。

关键词: 韩国礼服, 图像识别, 线形结构形态学, CLAHE, K-Means

CLC Number:

TS941.2

GAO Ting, ZHUANG Meiling, SHI Lili, LIU Jing, WANG Jingxue. An algorithm for extracting inner and outer contours of korean dress images[J]. Advanced Textile Technology, 2022, 30(2): 197-207.

高婷, 庄梅玲, 石历丽, 刘静, 王敬雪. 一种韩国礼服图像的内外廓形提取算法[J]. 现代纺织技术, 2022, 30(2): 197-207.

Figures/Tables 20

Fig.1 The process of contour extraction algorithm

Fig.2 Examples ofKorean dress pictures

Fig.3 Morphological analysis of the outer contour of Korean dress

Tab.1 Double-factor experimental results of linear structural elements

c值	θ值
c值	0°	10°	20°	30°	40°	50°	60°	70°	80°	90°
0	0	0	0	0	0	0	0	0	0	0
1	0	0	0	0	0	0	0	0	0	0
2	110	0	0	0	0	0	0	0	0	244
3	285	225	343	400	464	467	288	358	63	184
4	384	400	288	288	346	175	175	288	184	460
5	551	551	433	615	503	577	508	275	467	460
6	592	558	503	433	592	523	573	389	167	588
7	592	649	649	649	418	523	629	514	514	414
8	788	815	815	896	725	639	807	514	694	635
9	788	1000	999	896	794	986	807	658	658	582

Tab.2 Results of double-factor analysis of variance for linear structure elements

来源	平方和	自由度	均方离差	F值	临界值	显著性
因素c	7903402.44	r-1=9	878155.8267	99.27	2	显著
因素θ	221238.24	s-1=9	24582.02667	2.7787	2	显著
误差E	716561.5388	(r-1)(s-1)=81	8846.438751
总和T	8841202.219	rs-1=99

Fig.4 Three dimensional cross influence

Fig.5 Univariate influence of θ andconL

Fig.6 Contour extraction of linear structural elements at different angles

Fig.7 Different length contour extractions of linear structural elements

Fig.8 Extracted results of different methods for the outer contour of Korean dress pictures

Fig.9 Gray linear interpolation calculation

Fig.10 Histogram clipping diagram of sub-block 2

Fig.11 Histogram of sub-block 2

Fig.12 The CLAHE algorithm processes the results

Fig.13 K-means collar ornament segmentation results

Fig.14 Region filling results

Fig.15 Schematic diagram of repair algorithm

Fig.16 Filling and repair results

Fig.17 Contour extraction results

Fig.18 Statistical results of edge length

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