# 画像からの座標の読み取り

조회 수: 92(최근 30일)
Chikako Kuriyama 2017년 7월 26일
댓글: Chikako Kuriyama 2017년 7월 28일

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michio 2017년 7월 28일
Image Analyst san, thanks for your offer :) If we see some hard-core image processing issues next time, I'll reach out to you!

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### 채택된 답변

たとえば、 こちら のサンプルを活用することでやりたいことが実現できるかと思います。
ご参考まで。
%%Detect Lines in Images Using Hough
% This example shows how to detect lines in an image using the |hough| function.
%%Read an image into the workspace and binarize it
BW = imbinarize(rgb2gray(I));
BW = imclearborder(BW);
%%Compute the Hough transform of the binary image returned by |edge|.
[H,theta,rho] = hough(BW);
%%Display the transform, |H|, returned by the |hough| function.
figure
'XData',theta,...
'YData',rho,...
'InitialMagnification','fit');
xlabel('\theta (degrees)')
ylabel('\rho')
axis on
axis normal
hold on
colormap(gca,hot)
%%Find the peaks in the Hough transform matrix, |H|, using the |houghpeaks|
% function.
P = houghpeaks(H,5,'threshold',ceil(0.3*max(H(:))));
%%Superimpose a plot on the image of the transform that identifies the peaks.
x = theta(P(:,2));
y = rho(P(:,1));
plot(x,y,'s','color','black');
%%Find lines in the image using the |houghlines| function.
lines = houghlines(BW,theta,rho,P,'FillGap',30,'MinLength',50);
%%Create a plot that displays the original image with the lines superimposed
figure, imshow(I), hold on
max_len = 0;
len = zeros(length(lines),1);
for k = 1:length(lines)
xy = [lines(k).point1; lines(k).point2];
plot(xy(:,1),xy(:,2),'LineWidth',1,'Color','green');
% Presave line length
len(k) = norm(lines(k).point1 - lines(k).point2);
end
%%Connect lines
theta = [lines.theta];
theta(theta>0) = -Inf;
[~,min_angle] = max(theta);
theta = [lines.theta];
theta(theta<0) = Inf;
[~,max_angle] = min(theta);
pts = [lines(min_angle).point1; lines(min_angle).point2; lines(max_angle).point2;...
lines(max_angle).point1; lines(min_angle).point1];
plot(pts(:,1),pts(:,2),'LineWidth',2,'Color','red');
##### 댓글 수: 1표시숨기기 없음
Chikako Kuriyama 2017년 7월 28일

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### 추가 답변(2개)

Takuji Fukumoto 2017년 7월 26일
エッジ検出が終わっているということで、2値化された画像をお持ちの状態かと思います。 regionprops関数を利用するとその画像のパラメータを取得することができます。

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Chikako Kuriyama 2017년 7월 27일
ありがとうございます！早速試してみます。

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