Find the actual distances in an image.

조회 수: 3(최근 30일)
Chathu 2016년 4월 15일
댓글: Chathu 2016년 4월 30일
I want to find the minimum x(1) value which touches the image,A. Then maximum x(2) value which touches the image,A.(ps:image is attached). I made the axis ON. SO i want to let the program identify the x(min), x(max),y(min) and y(max), next draw straight lines(as shown in the image) along above said points(eg:x(1),x(2),etc) and then perform the spatial calibration (note; image is not symmetric). Can anyone give me a hint how to resolve this issue.
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Chathu 2016년 4월 15일
it is an image. Let me add it here now. Sorry for the confusion.

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채택된 답변

Mohammad Abouali
Mohammad Abouali 2016년 4월 15일
Similar approach to this should work:
I=padarray(I,[1 1 0],0);
thresh = 15;
mask = ~(I(:,:,1) < thresh & I(:,:,2) < thresh & I(:,:,1) < thresh);
xProj = any(mask);
xMin = find(xProj,1,'first')-0.5;
xMax = find(xProj,1,'last');
yProj = any(mask,2);
yMin = find(yProj,1,'first');
yMax = find(yProj,1,'last');
hold on
plot([xMin xMin],ylim,'r','LineWidth',2)
plot([xMax xMax],ylim,'r','LineWidth',2)
plot(xlim,[yMin yMin],'r','LineWidth',2)
plot(xlim,[yMax yMax],'r','LineWidth',2)
  댓글 수: 4
Chathu 2016년 4월 30일
@ Mohammad, i saw your response just now. Your approach is perfect for my purpose, as it is short distance.
Thank you so much for your response. Highly appreciate it:)

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추가 답변(1개)

Image Analyst
Image Analyst 2016년 4월 16일
See my spatial calibration demo.
  댓글 수: 1
Chathu 2016년 4월 16일
Thank you so much Image Analyst. Highly appreciated.

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