Matlab绘图图像作为图形的背景 [英] matlab plot image as background to graph

问题描述

我有一张要设置为正在制作的情节背景的图像.但是，它将其绘制为使得图像沿轴([0 1000 0 1000])倾斜，而我的图形的轴则小得多:([24.5 24.6 67 67.1]).我如何对齐它，以使图像与图表具有相同的比例?

I have an image that I would like to set as the background of plot I am making. However it plots it so that the image taks up the axis([0 1000 0 1000]) while the axis for my graph is much smaller: ([24.5 24.6 67 67.1]). How do I align it so that the image is on the same scale as the graph?

我正在执行以下命令:

h = figure;
hold on
voronoi(lats,longs);
I=imread('my_fig.png');
hi = imagesc(I);
set(hi,'alphadata',.5);

推荐答案

您可以使用正确的x和y向量调用image，就像这样(假设您的数据在x和):

You can just call image with the right x and y vectors, like so (assuming your data is in x and y):

xImg = linspace(min(x), max(x), size(I, 2));
yImg = linspace(min(y), max(y), size(I, 1));
image(xImg, yImg, I, 'CDataMapping', 'scaled');
hold on;
plot(x, y);

换句话说，为图像的每个维度生成一个向量，该向量具有与图像的那个维度相同的点数，但是介于数据范围之间.

In other words, generate a vector for each of the dimensions of the image that has the same number of points as that dimension of the image but goes between the range of your data.

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