如何在matlab中的多个轮廓线内填充颜色 [英] How to fill color inside multiple contour line in the matlab

问题描述

我有一幅包含两条轮廓线的图像.我想在这些轮廓线内填充不同的颜色.如何执行呢?这是我的代码绘制两条轮廓线

I have one image that contains two contour line. I want to fill different colors inside these contour line. How to implement it? This is my code to draw two contour line

    function  FillColorContour(Img,phi1,phi2,color1,color2)
        imagesc(uint8(Img),[0 255]),colormap(gray),axis off;axis equal,title('FillColorContour')
        hold on,[c,h1] = contour(phi1,[0 0],'r','linewidth',1); hold off
        hold on,[c,h2] = contour(phi2,[0 0],'r','linewidth',1); hold off
    end

要使用它.我将通过命令调用:

To using it. I will call by a command:

        Img=imread('peppers.png');
        [Height Wide] = size(Img);
        [xx yy] = meshgrid(1:Wide,1:Height);
        phi1 = (sqrt(((xx - 60).^2 + (yy - 100).^2 )) - 15);
        phi2 = (sqrt(((xx - 100).^2 + (yy - 150).^2 )) - 15);

        FillColorContour(Img,phi1,phi2,'r','b') %Assume'r' is red, 'b' is blue

这是在 https://www.dropbox.com/s/ll4npg3cmturt4c/contourex之前.PNG 这是在运行 https://www.dropbox.com/s/pqi4rxluxfegxhn/contourexfill之后. png

推荐答案

使用contourc计算轮廓，并使用patch将其绘制为填充区域.

Use contourc to compute the contour and patch to draw it as a filled area.

按照您的代码(修饰过的；)

Following your (prettified ;) code

Img = imread('peppers.png');
[Height, Width] = size(Img);
[xx, yy] = meshgrid(1 : Width, 1 : Height);
imagesc(Img,[0 255])
axis off
title('FillColorContour')
phi1 = (sqrt(((xx - 60).^2 + (yy - 100).^2 )) - 15);

计算轮廓

cont = contourc(phi1, [0 0])';
cont = cont(2 : end, :);       % first line contains contour level and number of points; skip

并将其绘制为补丁":

patch(cont(:, 1), cont(:, 2), 'r', 'EdgeColor', 'w')

您可以分别选择填充颜色和边缘颜色.我用红色和白色.

You can choose the fill color and the edge color separately; I used red and white.

结果:

对于phi2，您当然只需要类似的代码.

For phi2 you of course need simply the analogous code.

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