将matlab.graphics.primitive.Image（imagesc的输出）转换为rgb数组 [英] Convert matlab.graphics.primitive.Image (output of imagesc) to rgb array

问题描述

我正在使用MATLAB函数

  imagesc（my_gray_valued_image）
  

可视化 my_gray_valued_image ： [1024x1024] double array 使用像 jet 这样的色彩映射，其值为0.0 - 1.0（灰度值）。

我想将输出存储为RGB图像（ [1024x1024x3]双数组）。但是函数的输出是一个Image对象（ matlab.graphics.primitive.Image ），它包含原始数组（ Image.CData ）但不允许提取带有颜色标记的图像。

跟随类似（虽然容易混乱）的问题（

I'm using the MATLAB function

imagesc(my_gray_valued_image)

to visualize my_gray_valued_image: [1024x1024] double array with values from 0.0 - 1.0 (gray values) using colormaps like jet.

I want to store the output as a RGB image ([1024x1024x3] double array). However the output of the function is a Image object (matlab.graphics.primitive.Image) that contains the original array (Image.CData) but doesn't allow to extract the colorscaled image.

Following a similar (although confusingly cluttered) question (How to convert an indexed image to rgb image in MATLAB?) I tried the following, but that gave me a plain blue image:

RGB = ind2rgb(my_gray_valued_image, jet);
imshow(RGB);

解决方案

here for arbitrary colormap:

im = rand(5); % input [0-1] image
figure;
h = imagesc(im); % imagesc handle
title('imagesc output')
cdata = h.CData; % get image data (if you don't have variable 'im')
cm = colormap(h.Parent); % get axes colormap
n = size(cm,1); % number of colors in colormap
c = linspace(h.Parent.CLim(1),h.Parent.CLim(2),n); % intensity range
ind = reshape(interp1(c,1:n,im(:),'nearest'),size(im)); % indexed image
rgb = ind2rgb(ind,cm); % rgb image
figure;
imshow(rgb,'InitialMagnification','fit');
title('rgb image')

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