双边二维四元数离散傅里叶变换后空间变换的α-开方彩色图像增强方法
Alpha-rooting color image enhancement method by two-side 2-D quaternion discrete Fourier transform followed by spatial transformation
摘要：
本文提出了一种四元数增强方法，将图像中的颜色视为单一实体。这种新的方法被称为α-生根的方法，彩色图像增强的二维四元数离散傅里叶变换（2-D QDFT），其次是一个空间变换。用二维DFT对该方法与相应的逐通道彩色图像增强算法进行了比较。将图像增强量化为基于视觉感知的增强测度，称为颜色增强测度估计（CEME）。初步实验结果表明，四元数图像增强方法是一种有效的彩色图像增强技术。
英文摘要：
In this paper a quaternion approach of enhancement method is proposed in which color in the image is considered as a single entity. This new method is referred as the alpha-rooting method of color image enhancement by the two-dimensional quaternion discrete Fourier transform (2-D QDFT) followed by a spatial transformation. The results of the proposed color image enhancement method are compared with its counterpart channel-by-channel enhancement algorithm by the 2-D DFT. The image enhancements are quantified to the enhancement measure that is based on visual perception referred as the color enhancement measure estimation (CEME). The preliminary experiment results show that the quaternion approach of image enhancement is an effective color image enhancement technique.
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