Choi Y-H, Kim D, Hwang E, Kim B J
School of Electrical Engineering, Korea University, Seoul, Korea.
Skin Res Technol. 2014 Nov;20(4):486-97. doi: 10.1111/srt.12143. Epub 2014 May 27.
BACKGROUND/PURPOSE: To date, the degree of skin damage caused by diverse factors, such as aging and persistent sunlight exposure, has been evaluated based on the personal experience and knowledge of dermatologists because there is no standard method for objective evaluation. If a standard method were available, patients could obtain more consistent information about their skin condition, and hence perform more effective treatment of the skin damage. In this paper, we demonstrate how to establish a standard method using dermoscopy images of subjects of various ages. We focus on three body parts, specifically the face, neck, and hands, and extract various skin texture features to quantitatively and objectively represent the skin condition.
We construct a model for skin damage evaluation based on various skin texture features. To accomplish this objective, we consider various features from face, neck, and hand dermoscopy images, including texture length, width and depth, cell area, the number of cells in a fixed region, radius ratio of inscribed and circumscribed circles of a wrinkle cell, and average perimeter of a wrinkle cell. In this study, a wrinkle cell represents the smallest skin region enclosed by textures. We then perform a linear regression for texture features based on subject age.
A dermoscopy image can be automatically analyzed by extracting skin texture features. We demonstrate aging trends by performing linear regression on these features. Based on this result, a quantitative and objective evaluation of the skin condition can be provided.
We proposed several new skin texture features and developed algorithms to accurately extract them. We analyzed these features and demonstrated their age-related change trends by using graphs and charts. We believe that our result can be used as a standard method for evaluating degrees of skin damage. Moreover, we believe that our proposed method can be applied in various areas, such as performance evaluation of certain skin products.
背景/目的：迄今为止，由于缺乏客观评估的标准方法，诸如衰老和长期阳光照射等多种因素所导致的皮肤损伤程度一直是根据皮肤科医生的个人经验和知识来评估的。如果有标准方法可用，患者就能获得关于其皮肤状况更一致的信息，从而对皮肤损伤进行更有效的治疗。在本文中，我们展示了如何利用不同年龄段受试者的皮肤镜图像建立一种标准方法。我们聚焦于三个身体部位，即面部、颈部和手部，并提取各种皮肤纹理特征，以定量且客观地呈现皮肤状况。
我们基于各种皮肤纹理特征构建了一个皮肤损伤评估模型。为实现这一目标，我们考虑了来自面部、颈部和手部皮肤镜图像的各种特征，包括纹理长度、宽度和深度、细胞面积、固定区域内的细胞数量、皱纹细胞内切圆与外接圆的半径比以及皱纹细胞的平均周长。在本研究中，一个皱纹细胞代表由纹理包围的最小皮肤区域。然后我们基于受试者年龄对纹理特征进行线性回归。
通过提取皮肤纹理特征可对皮肤镜图像进行自动分析。我们通过对这些特征进行线性回归展示了衰老趋势。基于此结果，可对皮肤状况进行定量且客观的评估。
我们提出了几种新的皮肤纹理特征并开发了准确提取它们的算法。我们分析了这些特征，并通过图表展示了它们与年龄相关的变化趋势。我们相信我们的结果可作为评估皮肤损伤程度的标准方法。此外，我们相信我们提出的方法可应用于各个领域，如某些皮肤产品的性能评估。
