在图像中查找笔记 [英] Finding notes in an image

问题描述

我有这样的图像。我想找到笔记的位置。找到它们的最佳方法是什么？ （它们不是圆圈，它们太小，所以circlefinder找不到它们！）

I have an image like this. And I want to find the location of notes. What is the best way to find them ? (They are not circle and they are so small so circlefinder can't find them !)

Notes的图片！

推荐答案

这里有一些代码可以帮到你......这不是很完美，但它只是一个有趣的哈哈。

Here is a bit of code to get you going...that's not perfect but it was a lof of fun haha.

我所做的是用磁盘结构元素侵蚀图像，直到图像中剩下的内容为止形状看起来最像圆圈。然后我再次受到侵蚀，但这次是一个线条结构元素，其角度接近音符的角度;我认为它大约是15度。

What I did is to erode the image with a disk structuring element until what was left in the image was shapes the looked the most like circles. Then I eroded again but this time with a line structuring element oriented at an angle close to that of the notes; I figured it's about 15 degrees.

之后，调用 regionprops 来获取质心，然后绘制它们。

After that, call regionprops to get the centroids, and then plot them.

代码：

clear
clc

BW = im2bw(imread('Notes.png'));
BW = imclearborder(BW);

%//Erode the image with a disk structuring element to obtain circleish
%// shapes.
se = strel('disk',2);        
erodedBW = imerode(BW,se);

此处 erodedBW 如下所示：

%// Erode again with a line oriented at 15 degrees (to ~ match orientation of major axis of notes...very approximate haha) 

se2 = strel('line',5,15);
erodedBW2 = imerode(erodedBW,se2);

erodedBW2 看起来像这样：

然后找到质心并绘制它们

Then find centroids and plot them

S = regionprops(erodedBW2,'Centroid');

figure;
imshow(BW)
hold on
for k = 1:numel(S)

   scatter(S(k).Centroid(:,1), S(k).Centroid(:,2),60,'filled')

end

输出：

没有检测到空白笔记，但我认为可以使用其他形态学操作进行管理。

Empty notes are not detected but that's manageable using other morphological operations I guess.

希望有帮助！

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