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I need to measure the size of plants from images. I made lots of research but none of them answer my question.

I know the distance between the plants and camera and using this information I want to calculate the objects real size in my case plants size.

On the internet I found that using some reference objects they can measure, however I can not use the reference objects.

I found similar questions on the stackoverflow, and I tried to proposed solutions and none of them work for me. 

import pydip as dip
import math

# Load image and set pixel size
img = dip.ImageReadTIFF('pic3.jpg')

I try to use pyDIP but, I got some errors. So it did not work.

Cris Luengo
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ozer
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    you are member since today so i am just advicing you to try some code, then give your codes in your question otherwise you will get many downvotes on your question. – Jainil Patel Jun 25 '19 at 13:18
  • you are asking so broad topic. – Jainil Patel Jun 25 '19 at 13:19
  • Measuring items without a reference object is impossible in my mind. You can take a photo of space or a photo of a bacteria. Without any reference, the bacteria will appear bigger than the stars in the galaxy. Ofcourse this is not the case in real life. – Wimanicesir Jun 25 '19 at 13:19
  • But in that case I know the distance between camera and the objects. I made some research and there some way to calculate size of objects without reference images. – ozer Jun 25 '19 at 13:22
  • This is a Hard Problem, one that hasn't been properly solved by *anyone*, because it requires a lot of image recognition - one of the things that computers are notoriously bad at. [This article](https://www.pyimagesearch.com/2015/01/19/find-distance-camera-objectmarker-using-python-opencv/) and [this article](https://www.pyimagesearch.com/2016/04/04/measuring-distance-between-objects-in-an-image-with-opencv/) are the most relevant, and possibly most helpful, things I could find for your particular situation, so good luck. – Green Cloak Guy Jun 25 '19 at 13:23
  • @GreenCloakGuy thanks for your advice but I found these articles and I tried them. Measuring distance between objects in an image with OpenCV is works well. However ı have to do that without using the reference image. – ozer Jun 25 '19 at 13:26
  • @JainilPatel thanks for your advice. I will add the entire code. However I could not find the where I found that code, as I cannot put reference to that code, I did not put entire code. But I will put entire code. Thank You – ozer Jun 25 '19 at 13:27
  • @JainilPatel Right know, there is one plant. – ozer Jun 25 '19 at 13:28
  • I did not understand the way you say. I sounds easy, but it is hard to build math behinds it. – ozer Jun 25 '19 at 13:31
  • https://stackoverflow.com/questions/42035721/how-to-measure-object-size-in-real-world-in-terms-of-measurement-like-inches-cen – Jainil Patel Jun 25 '19 at 13:33
  • the math behind it.... – Jainil Patel Jun 25 '19 at 13:34
  • I saw it, but most of the links are broken in the accepted answer. – ozer Jun 25 '19 at 13:35

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