how I can understand actual length of the car ? by camera calibration

Question

sara 2014-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/111946-how-i-can-understand-actual-length-of-the-car-by-camera-calibration

评论： Image Analyst 2014-1-10

采纳的回答： Image Analyst

we have camera at street , so how i can understand how many cm length of each car ? cars moving and the camera is fix

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Answer 1

Image Analyst 2014-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/111946-how-i-can-understand-actual-length-of-the-car-by-camera-calibration#answer_120469

spatial_calibration_demo.m

Sounds the same as your other question. Basically you need to calibrate with something of known length. See my attached demo.

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Image Analyst 2014-1-10

编辑：Image Analyst 2014-1-10

sara's three "Answers" moved here since they are replies to my answer and not actually "Answers" to her original posting. sara, click "Comment on this Answer" rather than "Answer this question" if you want to respond to me. I deleted your 3 "Answers" since they weren't answers.

please explain me more Image Analyst, i run it but it dose not show the real distance

if we have moving car at street ? how we can know how many cm length of each car ? the camera is fix and cars moving

help me ever body :(

Image Analyst 2014-1-10

I answered in your duplicate question : http://www.mathworks.com/matlabcentral/answers/111945#comment_189113 Perhaps you didn't see it. That's why it's not good to have the same conversation running in two different threads.

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