Division of Plastic Surgery, Department of Surgery, Cipto Mangunkusumo Hospital/Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia.
Department of Surgery, Premier Jatinegara Hospital, Jakarta, Indonesia.
J Surg Res. 2019 Mar;235:124-130. doi: 10.1016/j.jss.2018.09.077. Epub 2018 Oct 25.
This study is aimed to set a benchmark of skin color and texture index based on digital photographs for living and nonliving skin.
Photography was taken with standardized camera inside a Mini Mobile Medical Photo Studio (MiniMoPS) prototype. A pilot analysis was conducted by comparing color and surface texture of 16 living and cadaveric skins each. Baseline data of viable and nonviable skin were obtained and analyzed using ImageJ software for its color tone, components, and texture index. Results were expressed as total digital number (TDN).
MiniMoPS prototype consists of a dusty white foldable acrylic box, blue Pantone 635C background, and two 8-Watt light bulbs on the ceiling. The whole box is covered with a thick white cotton fabric to eliminate the influence of environmental light. The prototype was tested for its light intensity with David Quiles Lightmeter in various environments setting. It showed a constant result for skin photographs. The best probable cutoff point for skin color is TDN 138.1 (sensitivity 81.3%; specificity 100%). Cadaveric skin shows a higher texture digital number than living skin ([155.4 ± 25.0] versus 120 [80-135]; P = 0.001).
In regards of color, TDN >138 is a cutoff point for nonliving skin. Texture index 120 is a benchmark for living skin, whereas nonliving skin indicates 155.
本研究旨在为活体和非活体皮肤建立基于数字照片的肤色和纹理指数基准。
使用 MiniMoPS 原型内的标准化相机进行摄影。通过比较 16 个活体和尸体皮肤的颜色和表面纹理，进行了初步分析。使用 ImageJ 软件获取并分析了有活力和无活力皮肤的基线数据，用于其色调、成分和纹理指数。结果表示为总数字数（TDN）。
MiniMoPS 原型由一个布满灰尘的白色可折叠亚克力盒、蓝色 Pantone 635C 背景和两个天花板上的 8 瓦灯泡组成。整个盒子都覆盖着厚厚的白色棉织物，以消除环境光的影响。该原型在各种环境设置下使用 David Quiles 光度计进行了光强度测试。它显示出对皮肤照片的恒定结果。皮肤颜色的最佳可能截断点为 TDN 138.1（敏感性 81.3%；特异性 100%）。尸体皮肤的纹理数字比活体皮肤高（[155.4±25.0] 与 120 [80-135]；P=0.001）。
在颜色方面，TDN＞138 是无生命皮肤的截断点。纹理指数 120 是活体皮肤的基准，而非活体皮肤则为 155。
