The speed function defined in Level set method can be divided into two classes: function based on the gradient of image and function based on the image gray.
水平集方法的速度函数定义根据所利用的图像信息可以分为两大类：基于图像梯度和基于图像灰度信息。
2
The use of moments for image analysis is straightforward if we consider a binary or gray levelimage segment as a two-dimensional density distribution function.
若把二值图或灰度图看作是二维密度分布函数，就可把矩技术应用于图像分析中。
3
Thus, we propose that the blend of a full-color image can be viewed as superposition of two complementary gray - level transformation images.