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总览 评价 徐奕 1,* , 丁晓伟 2, ( 1、 上海交通大学图象通信与信息处理研究所; 2、 上海交通大学电子系; ) 摘要: 当前的黑白图像彩色化技术需要用户给出scribble,这个过程是非常繁琐费时的。并且物体边缘的色彩渗透也经常发生。本文主要研究自动sc
徐奕1,*, 丁晓伟2,
(
1、上海交通大学图象通信与信息处理研究所; 2、上海交通大学电子系; )
摘要:
当前的黑白图像彩色化技术需要用户给出scribble,这个过程是非常繁琐费时的。并且物体边缘的色彩渗透也经常发生。本文主要研究自动scribble产生技术和基于四元代数的结构保持机制。首先我们在空间分布熵极值点上自动产生scribble。有了scribble,我们计算四元数小波相位来引导色彩在等相位线上蔓延,这些等相位线跨越图像结构相似的区域。尺度空间下的边缘强度模型被用来约束色彩在同一边缘上蔓延。最后,我们将颜色作为向量在四元数极坐标色彩表示下进行重构,很好的保持了色彩通道之间的内在关系。实验证明使用自动产生的scribble和本文提出的彩色化方法能够在实现自然的彩色化效果。
关键词:
彩色化;自动scribble产生;结构保持机制;四元代数
XU Yi1,*, DING Xiaowei2,
(
1、Institute of Image Communication and Information Processing, Shanghai Jiao Tong University; 2、Electrical Engineering Department, Shanghai Jiao Tong University ; )
Abstract:
In current colorization techniques, major user intervention is required in the form of tedious, time-consuming scribble drawing. Moreover, color leakage usually occurs across contours and object boundaries. In this paper, we focus on automatic scribble generation and structure-preservation mechanism. Firstly, we generate scribbles automatically along points where the spatial distribution entropy achieves locally extreme value. Given the color scribbles, we compute quaternion wavelet phases to conduct colorization along equal-phase lines. These lines across scribbles and monochrome patches locate textures with similar pattern distribution. Contour 'strength' model is also established in scale space to direct color propagation among similar edge structures. Finally, we reconstruct color image patches as vector elements using polar representation in quaternion algebra, well-preserving interrelationship between color channels. The experimental results demonstrate that the proposed colorization method can achieve natural color transitions between different objects with automatically generated scribbles.
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