如何在MATLAB中改变边缘的颜色?

时间:2017-11-20 14:44:18

标签: image matlab colors matlab-figure edge-detection

我有一个脚本,它将图像带到并应用一些边缘检测方法,如canny,sobel和log。当我运行文件时,会绘制一个边缘为白色的图形。

有没有办法将边缘的颜色更改为首选颜色?

function cw1
  im0 = imread('lighthouse.png');
  im = rgb2gray(im0);
  im3 = edge(im,'canny');
  im4 = edge(im, 'sobel');
  im5 = edge(im, 'log');
  im2 = my_edge1(im);
  subplot(3,2,1), subimage(im); title ('Original'); axis off
  subplot(3,2,2), subimage(im2); title ('My Edge'); axis off
  subplot(3,2,3), subimage(im3); title ('Canny'); axis off
  subplot(3,2,4), subimage(im4); title ('Sobel'); axis off
  subplot(3,2,5), subimage(im5); title ('Log'); axis off
end

1 个答案:

答案 0 :(得分:1)

这个问题并没有明确定义,但无论如何我都会尝试提供帮助。这是使用绿色边缘的演示:

function q47394633
  im = rgb2gray(imread('peppers.png'));
  e = edge(im); % logical matrix, where "true" indicates an edge.
  g = reshape(uint8([0 255 0]),[1,1,3]) .* uint8(e); % Turn the above to RGB while making
  figure();                                          % only the green channel nonzero.
  subplot(3,1,1); imshow(e);    % Show white edges
  subplot(3,1,2); imshow(g);    % Show green edges
  subplot(3,1,3); imshow(im+g); % Show green edges on the image
end

enter image description here