The nebula gets its name because optical images show dust obscuring some of the nebula's glowing gas in a shape reminiscent of the arcade character.
星云所以取得这个名称，是因为它们的光学图像显示了尘埃把一些星云的发光气体模糊化地形成了使人联想到拱形特征。
Shape is the inherence characteristic of an object in the image, and it is the important character used for the object recognition.
形状是图像中目标的基本内在特性，是用于目标识别的重要特征，因此基于形状的目标识别方法研究具有重要意义。
In image retrieval, it gives a new method to get shape character of image, and image retrieval operation based the arithmetic was realized.
在图像检索中，该算法用一种新方式提取形状特征，实现了基于该算法的图像检索操作。
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