摘要
油画主题色体现了油画中所表达的主要色彩结构.文中提出一种油画主题色提取方法,首先根据色彩和谐模式预设主色相数量,把输入油画图像色相直方图与色彩和谐模式进行匹配,将色相环划分成若干色相带并依据匹配的模式类型提取主色相;然后利用主色相信息把输入图像划分成若干局部区域,对每个区域中的像素计算纯度直方图并从中提取出主纯度波峰,再用这些主纯度信息将上述局部区域细分为更小区域,对里面的像素计算明度直方图并提取出主明度;最后用得到的主色相、主纯度和主明度合成出候选主题色,并利用HSL欧氏距离在候选主题色中挑出最终主题色.与已有方法对比的实验结果表明,该方法在主题色中能保留数量少、但视觉上明显的像素色彩.
Theme colors of oil painting represent the colorful keynote in the painting. In this paper we present a method for extracting theme colors from oil painting images. First, we predefine the number of main hues based on the color harmony type, and match the hue histogram with color harmony type. Second, we divide the hue ring into several segments with which the main hues can be detected. We assign pixels fallen into the hue segments with detected main hue values and calculate their saturation histograms from which the main saturations can be extracted. We further divide pixels associated with main saturations into subgroups and extract the main lightness from their histograms in the same manner. The candidates of theme colors are then composed by the components of the main hues, main saturations and main lightness and the theme colors are selected by use of Euclid distance in HSL space. Our method has the advantage over some of existing methods in preserving colors presented in a small number of pixels but visually significant.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2014年第10期1576-1582,共7页
Journal of Computer-Aided Design & Computer Graphics
基金
国家自然科学基金(61379069)
国家科技支撑计划(2014BAK09B04)
国家社科基金重大项目(12&ZD231)
关键词
主题色
油画
色彩和谐
直方图
theme colors
oil painting
color harmony
histograms
