此功能显示一个图像，自动设置颜色映射到灰色…
代码说明：
This function displays an image, automatically setting the colour map to grey if it is a 2D image, or leaving it as colour otherwise, and setting the axes to be equal . The image is also displayed as TrueSize , that is, pixels on the screen match pixels in the image. Finally a title corresponding to the image variable name is added.-This function displays an image, automatically setting the colour map to grey if it is a 2D image, or leaving it as colour otherwise, and setting the axes to be equal . The image is also displayed as TrueSize , that is, pixels on the screen match pixels in the image. Finally a title corresponding to the image variable name is added.
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