透明涂饰对木材纹理等视觉特征的影响分析

对5种木材进行聚氨酯清漆透明涂饰处理,借助数字图像处理技术定量检测涂饰前后9种材色和纹理参数的变化:色调、饱和度、亮度、对比度、二阶角矩、方差和、长行程加重因子、分形维数、小波水平能量分布比重.结果表明:透明涂饰总体上有利于增强木材表面的视觉效果,但影响效果视素材的纹理情况而定.素材纹理原本清晰、明显时,其纹理效果略有变化,但并不显著;而原本呈弱纹理及或隐纹理的素材,透明涂饰对改变其视觉效果的影响作用显著.基于参数的t检验结果,饱和度、亮度、方差和3个参数可以作为涂饰对纹理影响性的重要指标,进而建立起反映透明涂饰对木材视觉效果综合影响的坐标公式.

Effect of clear lacquer on textural vision of wood surface

Clear lacquer is playing an important role in improving visual decorative effect of woodworks, and prolonging the endurance to environment, so the quantitative measurement of lacquer effect on wood surface vision is important. It painted five wood species with polyurethane lacquer, and measured the changes of wood surface vision by nine chromatic and textural parameters: hue, saturation, illuminance, contrast ratio, angular second moment, sum of variances, long_runth emphasis, fractal dimension, horizontal energy percentage of wavelet, and the results showed that clear lacquer could totally strengthen the visual effect of wood surface, but the influence degree for different textural types were different. For originally clear and apparent texture species, the being affected extent were intensified, but not remarkable; for originally either weak or textureless species, the being affected extents by clear lacquer were comparatively intensified, and remarkable. On base of t test, saturation, illuminance and sum of variances were selected as primary parameters to indicate the effect of clear lacquer on wood textural vision.