Chroma key using a checker pattern background
Chroma key using a checker pattern background
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DOI：
10.1093/ietisy/e90-d.1.242
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发表时间：
2007-01-01
影响因子：
0.7
通讯作者：
Kaneko, Toru
中科院分区：
文献类型：
--
作者：
Agata, Hiroki;Yamashita, Atsushi;Kaneko, Toru
本文提出了一种新的基于色键的双色棋盘格背景图像区域提取方法。该方法解决了传统色键技术中前景对象在其颜色与背景颜色相同时变为透明的问题。该方法利用了背景中两个色调区域之间的邻接条件和背景网格线的几何信息。该方法的过程包括四个步骤：1）背景颜色提取，2）背景网格线提取，3）前景提取，4）图像合成。对于背景颜色的提取，采用了颜色空间的方法。在背景网格线的提取方面，由于背景网格线区域的颜色可能是两种背景颜色的合成，并且与两种背景颜色不同，因此很难通过颜色空间的方法提取背景网格线。因此，从两个背景颜色之间的相邻条件中提取背景网格线。在前景提取方面，通过检测前景和背景的边界，重新检测出与背景颜色相同的前景区域和与前景颜色相同的背景区域。为了检测与背景颜色相同的区域，利用与背景网格线的相邻条件。至于图像合成，执行对新背景的前景边界的颜色进行平滑的过程，以创建自然图像。实验结果表明，无论前景物体的颜色如何，该方法都能准确地将前景物体从背景中分割出来。
In this paper, we propose a new region extraction method using chroma key with a two-tone checker pattern background. The method solves the problem in conventional chroma key techniques that foreground objects become transparent if their colors are the same as the background color. The method utilizes the adjacency condition between two-tone regions of the background and the geometrical information of the background grid line. The procedure of the proposed method consists of four steps: 1) background color extraction, 2) background grid line extraction, 3) foreground extraction, and 4) image composition. As to background color extraction, a color space approach is used. As to background grid line extraction, it is difficult to extract background grid line by a color space approach because the color of this region may be a composite of two background colors and different from them. Therefore, the background grid line is extracted from adjacency conditions between two background colors. As to foreground extraction, the boundary between the foreground and the background is detected to recheck the foreground region whose color is same as the background, and the background region whose color is same as the foreground. To detect regions whose colors are same as the background, the adjacency conditions with the background grid line are utilized. As to image composition, the process that smoothes the color of the foreground's boundary against the new background is carried out to create natural images. Experimental results show that the foreground objects can be segmented exactly from the background regardless of the colors of the foreground objects.