二层减法聚类图像颜色迁移算法

提出了一种图像自动颜色迁移方法，利用二层减法聚类将图像分成一定数量的子块，通过灰度差值直方图方法提取子块纹理特征，建立目标图像与源图像间子块的最佳对应关系，选取各子块数据点密度较大的像素组成子块的样本块，在对应源图像样本块中查找目标样本块的最佳匹配像素，完成样本块间颜色迁移，进而根据已上色的样本块完成目标图像的全局颜色迁移.该算法既适用于彩色图像间颜色迁移也适用于灰度图像上彩色.

Color Transfer between Images with Two-layer Subtraction Cluster

An automatic color transfer method is proposed. The two-story subtraction cluster is used to divide the color image into a certain number of subsets, through the gray margin histogram extract texture feature of each subsets, the best correspondence between subsets of source and target images is established, then certain larger density pixels are selected in corresponding subset to construct swatch. The color information is transferred between swatches from the matched pixel in source swatch to target one, the final colors are assigned to each pixel of the target image by matching pixel to pixel in the target swatches. The algorithm can be used to transfer color not only between two color images but also between a grey image and a color image.