著者

崔 童殷 中村 顕輔 黒川 隆夫

雑誌

Journal of textile engineering (ISSN:13468235)

巻号頁・発行日

vol.52, no.6, pp.243-251, 2007-02-15

著者

崔 童殷 中村 顕輔 黒川 隆夫

出版者

一般社団法人 日本繊維機械学会

雑誌

繊維機械学会誌 (ISSN:03710580)

巻号頁・発行日

vol.58, no.6, pp.T68-T75, 2005

被引用文献数

9

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This paper proposes a method of simulating breast shape modification by wearing a brassiere. For this purpose a three-dimensional (3D) human body shape model developed by one of the authors is used. The model is made of a bi-cubic B-spline surface and its control points can describe a woman's trunk shape by fitting it to plenty of her body surface points. Corresponding control points among models have the same meaning in the sense that they form the same region on the different women's body surfaces. This feature enables us to compare and analyze a local body shape using a subset of control points selected appropriately. Forty-nine control points were determined to analyze breast shape of any woman. One hundred forty-two Japanese women aged 20's to 50's (brassiere size ranged from A70 to E70) were measured by means of an optical range finder before and after putting on a brassiere. We also categorized softness of their breasts into three classes; "soft", "medial", and "stiff". The multiple regression analysis established the relationship between the position of the control points on the models before and while wearing a brassiere using softness as a parameter. The best regression function was chosen among prepared 15 ones for each coordinate of every control points and was applied to simulation of brassiere-wearing breast figures based on the position of the control points before putting on it. The results showed that it is possible to estimate the body shape when wearing a brassiere. The same was confirmed based on average errors between silhouettes of brassiere-wearing and simulated breasts.

著者

崔 童殷 中村 顕輔 黒川 隆夫

出版者

一般社団法人 日本繊維機械学会

雑誌

Journal of Textile Engineering (ISSN:13468235)

巻号頁・発行日

vol.52, no.6, pp.243-251, 2006

被引用文献数

2

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The purpose of this research is to analyze Japanese women's breast shape based on body surface data described by a three-dimensional (3-D) human body shape model with a bi-cubic B-spline structure and to classify them. The data used for analysis were forty-nine 3-D control points selected from the right breast area on the model surface for each of 556 Japanese women aged 19 through 63 years. We examined the covariance matrix of the data using the principal component analysis method after normalization of their 3-D coordinates with the bust width for reducing the size factor. As a result, we obtained four principal components, which described 77% of breast shape. Then Japanese women's breast shape was classified into five classes in the principal component space using the first, second, third and forth-principal component scores. They could cover 92% of Japanese women's breasts. Therefore, we tried to analyze breast shape by clustering in order to classify all the breasts. For the cluster analysis we prepared two kinds of data; (1) principal component scores and (2) the normalized scores (μ=0, σ=1) of (1). With the clustering (1) and (2) we obtained four classes and five classes, respectively. Properties and advantages of the three kinds of classifications were also discussed. The classification of the principal component space is based on standard deviations of principal component scores, and therefore the resultant classes do not have clear boundaries. The classification according to the cluster analysis (1) can reflect the actual distribution of breast shape. In contrast the clustering (2) gives classification reflecting more principal components and tending to generate more classes than the clustering (1).

著者

崔 童殷 中村 顕輔 黒川 隆夫

出版者

一般社団法人 日本繊維機械学会

雑誌

Journal of Textile Engineering (ISSN:13468235)

巻号頁・発行日

vol.52, no.6, pp.243-251, 2006 (Released:2007-03-06)

参考文献数

12

被引用文献数

2

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The purpose of this research is to analyze Japanese women's breast shape based on body surface data described by a three-dimensional (3-D) human body shape model with a bi-cubic B-spline structure and to classify them. The data used for analysis were forty-nine 3-D control points selected from the right breast area on the model surface for each of 556 Japanese women aged 19 through 63 years. We examined the covariance matrix of the data using the principal component analysis method after normalization of their 3-D coordinates with the bust width for reducing the size factor. As a result, we obtained four principal components, which described 77% of breast shape. Then Japanese women's breast shape was classified into five classes in the principal component space using the first, second, third and forth-principal component scores. They could cover 92% of Japanese women's breasts. Therefore, we tried to analyze breast shape by clustering in order to classify all the breasts. For the cluster analysis we prepared two kinds of data; (1) principal component scores and (2) the normalized scores (μ=0, σ=1) of (1). With the clustering (1) and (2) we obtained four classes and five classes, respectively. Properties and advantages of the three kinds of classifications were also discussed. The classification of the principal component space is based on standard deviations of principal component scores, and therefore the resultant classes do not have clear boundaries. The classification according to the cluster analysis (1) can reflect the actual distribution of breast shape. In contrast the clustering (2) gives classification reflecting more principal components and tending to generate more classes than the clustering (1).