MATLAB:在包含RGB图像的图形中显示灰度图像的颜色条 [英] MATLAB: Show colorbar of a grayscale image in a figure containing a RGB image

问题描述

假设我们有两个图像:

1)RGB图像:

% initialize RGB image:
rgbIm = zeros(100, 100, 3); 
rgbIm(20:80, 20:80, 1) = 1;

2)灰度图像:

% initialize grayscale image:
grayIm = zeros(100);
grayIm(20:80, 20:80) = 1;

让它们同时显示:

figure, imshow(rgbIm),  colormap('jet'), colorbar;
figure, imshow(grayIm), colormap('jet'), colorbar;

正如我们所看到的，第二张图中的 colorbar (即灰度图像)是完全有意义的.另一方面，我无法真正理解第一张图中的颜色图所给出的信息.

As we can see, the colorbar in the 2nd figure (i.e. grayscale image) makes total sense. On the other hand I can't really understand the information given by the colormap in the 1st figure.

我要实现的是在与RGB图像相对应的图中显示灰度图像的颜色栏.

这似乎没有什么意义，但这只是我做一个很小的例子，以展示我想在更大的项目中做什么.

It might seem that this does not make sense but this is just a very minimal example that I just made up to show what I would like to do in a larger project.

有什么想法吗?

非常感谢:)

EDIT1 :请允许我解释为什么我需要这样做

Allow me to explain why I would need this

假设我在感兴趣的某些区域计算一个MRI切片的一些生理参数，结果如下:

Suppose I compute some physiological parameters one MRI slice in certain regions of interest, yielding something like this:

现在，我想将这些参数叠加在原始切片的顶部，并创建一个RGB图像来实现此目的:

Now I want to superimpose these parameters on top of the original slice, and I create one RGB image to achieve this:

颜色图没有意义，这就是为什么我要在RGB图像(即叠加图像)中显示与参数图像相对应的颜色图.

The colormap does not make sense, and this is why I would like to display the colormap corresponding to the parametric image in the RGB image (i.e. the superimposition image).

有什么想法吗?

感谢您的关注.

推荐答案

(回答我自己的问题，希望以后可以帮助某人)

(Answering my own question so I can hopefully help someone in the future)

借助上述答案和

I just accomplished what I intended, with the help of the above answer and a post from Steve Eddins' blog. Here's how:

baseImage = baseImage/(max(baseImage(:))); % normalize base (anatomical) image
rgbSlice  = baseImage(:,:,[1 1 1]);        % converting to RGB (ignore colormaps)
imshow(parameterROIImage, []);             % show parametric image
colormap('jet');                           % apply colormap
hold on;
h = imshow(rgbSlice);                      % superimpose anatomical image
set(h, 'AlphaData', ~bwROIlocations);      % make pixels in the ROI transparent
colorbar;       

其中parameterROIImage是:

bwROIlocations是包含ROI像素的逻辑矩阵:

bwROIlocations is the logical matrix containing the ROI pixels:

最终结果:

感谢Shai的帮助.

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