How to measure the length of the particular region?

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Dinesh Kumar Kanagaraj 2018-3-17

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评论： Dinesh Kumar Kanagaraj 2018-3-20

Hi, I am new to image processing field and I want to know how to measure the length and width of the particular image using Matlab.

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Answer 1

Von Duesenberg 2018-3-17

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It depends on your goal. If you want the number of pixels, the size of your image in the workspace (with the size function) should give you this info. If you want real world units, you'll have to calibrate your camera: https://fr.mathworks.com/help/vision/ug/camera-calibration.html

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Answer 2

Image Analyst 2018-3-17

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在 MATLAB Online 中打开

spatial_calibration_demo.m

Try this:

[rows, columns, numberOfColorChannels] = size(yourImage);

If you need the lengths in real world units, see my attached spatial calibration demo.

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Image Analyst 2018-3-19

在 MATLAB Online 中打开

Wow, I don't know how we were expected to guess that given what you told us first. Anyway, use find

binaryImage = sobelImage > 128; % Or whatever value works.
topRow = find(binaryImage(:, 240), 1, 'first');
bottomRow = find(binaryImage(:, 240), 1, 'last');
leftColumn = find(binaryImage(300, :), 1, 'first');
rightColumn = find(binaryImage(300, :), 1, 'last');

Dinesh Kumar Kanagaraj 2018-3-20

This 4 lines is suitable for all sizes of images or only 480*480 images.. And can u give some notes to understand this concept...because I am doing real time project based on this method...

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