Estimation of noise in the multispectral camera and recovery of spectral reflectance

数字博物馆是珍贵绘画的数字档案馆，是它们在展示设备上的逼真图像再现。一幅画的颜色、外观和印象随着照明的不同而有很大的不同，即它们取决于它们的光谱能量分布，如日光或烛光以及它们的照度水平。考虑到人类视觉系统的颜色适应性，人们对各种光照下的彩色图像的再现进行了广泛的研究。在本报告中，描述了利用图像数据准确地恢复日本、油彩和水彩画等三种类型绘画的光谱反射率，而不需要事先知道用于绘制它们的颜色材料，以及通过使用恢复的光谱反射率在显示设备上忠实地再现各种光照下绘画的颜色。

Digital museum is the digital archive of valuable paintings and is the realistic image reproductions of them on a display device. The color appearance and the impression of a painting differ markedly with the illuminations, i.e., they depend on their spectral power distributions such as a daylight or a candlelight and their illuminance levels. Extensive studies have been carried out to reproduce color images under various illuminations by taking into account the chromatic adaptation of human visual system.In this report, it is described that spectral reflectances of three types of painting such as Japanese, oil color and water color paintings are accurately recovered by the use of image data without prior knowledge of color materials used to paint them and that the colors of a painting under various illuminations are reproduced faithfully on a display device through the use of the recovered spectral reflectances.