Material appearance is an important factor in product design because it tends to attract consumers. Effect coatings that contain aluminum and interference pigments are widely used in automobiles. The color and sparkle values of these coatings vary with the observation angle. Several methods have been proposed to study these variations with respect to the observation angle. However, a high angular resolution is required to understand human perception. Thus, we developed a measurement device that can analyze the color and sparkle values at a high angular resolution for multiple angles. The device captures the sample surface by using a line scan spectral camera. Because the lighting device rotates around the sample while the line scan camera is capturing images, each scan line that makes up the image contains different angle information. A comparison was performed among the results obtained from this study, a commercially available device, and a subjective value of sparkle perception. Twenty samples were required to confirm that the sparkle values calculated from this study correlated closely with the subjective scores. In addition, the difference between the color values obtained from the BYK-mac i spectrophotometer and the proposed technique was less than 3.5 (ΔE₀₀). The findings of this study will help in developing the appearance of effective coatings. In addition, using evaluation values, quality control, and improvement are possible after mass production of coatings.

中文翻译：

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用于分析涂层外观的多角度测量装置

材料外观是产品设计中的一个重要因素，因为它往往会吸引消费者。含有铝和干涉颜料的效果涂料广泛用于汽车。这些涂层的颜色和闪光值随观察角度而变化。已经提出了几种方法来研究这些关于观察角度的变化。然而，理解人类感知需要高角度分辨率。因此，我们开发了一种测量设备，可以在多个角度以高角度分辨率分析颜色和闪光值。该设备使用线扫描光谱相机捕获样品表面。由于在线扫描相机拍摄图像时照明设备围绕样品旋转，因此构成图像的每条扫描线都包含不同的角度信息。对从这项研究中获得的结果、市售设备和闪光感知的主观价值进行了比较。需要 20 个样本来确认从这项研究中计算出的闪光值与主观评分密切相关。此外，从 BYK-mac i 分光光度计获得的颜色值与所提出的技术之间的差异小于 3.5 (ΔE ₀₀ )。这项研究的结果将有助于开发有效涂层的外观。此外，在涂料量产后，可以使用评价值、质量控制和改进。