%# read image
I = imread('coins.png');
%# Convert to a binary image
BW = im2bw(I, graythresh(I));
%# get object boundaries
BW = imfill(BW,'holes');
B = bwboundaries(BW,'noholes');
%# plot boundaries overlayed on top of image
imshow(I), hold on
for i=1:numel(B)
plot(B{i}(:,2), B{i}(:,1), 'Color','g', 'LineWidth',2)
end
hold off
Here is an example code in MATLAB:
%# read image
I = imread('coins.png');
%# Convert to a binary image
BW = im2bw(I, graythresh(I));
%# get object boundaries
BW = imfill(BW,'holes');
B = bwboundaries(BW,'noholes');
%# plot boundaries overlayed on top of image
imshow(I), hold on
for i=1:numel(B)
plot(B{i}(:,2), B{i}(:,1), 'Color','g', 'LineWidth',2)
end
hold off
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Inkscape（开源 C++）中有一个轮廓跟踪器。
http://inkscape.org/doc/tracing/tutorial-tracing.html
这将转换为矢量格式 - 所以你可以通过这种方式得到一些点。
编辑：这实际上使用 http://potrace.sourceforge.net/ 进行跟踪。
There's an outline tracer in Inkscape (which is open source c++).
http://inkscape.org/doc/tracing/tutorial-tracing.html
This will convert to vector format - so you could get some points out this way.
EDIT: this actually uses http://potrace.sourceforge.net/ for the tracing..
以下是 MATLAB 中的示例代码：
Here is an example code in MATLAB: