在Matlab图像中为NaN值分配不同的颜色 [英] Assign different color to NaN values in Matlab images

问题描述

我正在Matlab上处理卫星图像，并正在编写用于计算净辐射的代码.输出包含具有NaN值的矩阵形式的图像.当我尝试使用以下方式进行绘制时:

I am working with satellite images on Matlab and am writing a code for calculating Net Radiation. The output contains the image in form of a matrix with NaN values. When I try to plot it using:

figure
imshow(X);

它为NaN值分配与0相同的颜色.是否可以通过任何方法将这些值分配为不同的颜色?

it assigns the NaN values the same color as 0. Is there any way I can assign those values to be a different color?

此外，我想将矩阵另存为图像，但格式不能更改，可能是ASCII.是否有将矩阵转换为ASCII的工具?

Also, I want to save my matrix as an image, but in a format that its values don't get changed ... possibly ASCII. Is there a tool for converting matrix to ASCII?

推荐答案

如果您的X矩阵是2矩阵，其值介于0和1之间，且值为NaN，则可以使用以下命令将NaN值更改为例如0.88

If your X matrix, is a 2D matrix with values between 0 and 1 and NaN values, you can use the following command to change NaN values to for example 0.88.

X(isnan(X))=0.88;

但是如果X矩阵是3D(对于RGB)，答案会略有不同，并且此解决方案不起作用.

but if the X matrix is 3D (for RGB) the answer is slightly different and this solution does not work.

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