Maybe is because my object is not in the left corner. Simply detect the red bounding rectangle compute its bounding box.chi, how can i get pixel measurement of object in an image instead of inches?Thanx for the nice work Andrian, I want to measure particle size distribution for particles on a fast moving conveyor belt.
Feel free to email in the image though and I’ll try to take a look.Hi Adrian! Does it work with other colors for background?You need to be able to segment objects such that they are “white” on a “black” background. That said, you really need to perform an intrinsic/extrinsic calibration for the most accurate measurements.Thanks for the tutorial, is it possible to get exact dimensions (area occupation in image or percentage)?Yes, very easily. You could use a package like Python’s “requests” and then send it to the API service.Is it possible to fix the distance between the pi camera and the objects that I am going to measure so that the size of objects is fixed no matter how the camera is moved? He told me that I can use any kind of programming language. I’m trying to build a model for easy checkout in departmental stores. (I want it to work like automated – scripted dolly zoom to be clear, if the occupation increases zoom out, if it decreases zoom in)Thank you so much for this great tutorial. Could you help me out?Superb Tutorial Adrian. Finally, using the pixels and the known dimensions I would find the pixels per metric. To address your questions:1. if i suppose to change image width or image quality , measurement size will be changed. Fixed it in two hours. Otherwise, if you know the contour of the body, then you might be able to apply splines to determine the length, but that’s something I have not done.thanks for your sharing! Would that be a right approach?Yes, if you can manually label the ROI and use the ROI to compute the dimensions this is essentially equivalent to teh calibration step.I have one template image where i have fixed size rectangle which contain some information. In case, if not useful can you help me with some other tips.I’m not sure what you mean by the “direction” of an artichoke?Can you please guide me how to find the measurement of detected objects?
Can i do that with instrinsic and extrinsic calibration.
please help me with that.Hi Nana — you would need to use camera calibration and ideally multiple cameras to do this project. but don’t know why it is only measuring one object. OOT, The end goal of my undergraduate thesis is to create an Android app that is capable to measure weight of cattle using camera.
In the meantime, take a look at Thank you so much for this post- it’s really great!For some reason, this script doesn’t animate for me like yours does.
Guess is that either the “source” or “workon” command failed.Can you list out all the applications of the project in real life.Use your imagination, give it some thought, and do a bit of research. You’ll need to debug your code.If I wanna to make a UI for this project with Visual Studio or maybe PyQT.
I am doing hand measurement for my project. If I crop the image to keep the coin part, and then use the labelling method to find its size in pixels. It won’t be easy if you are new to writing code but if you practice each day I’m confident you can do it.This is a very useful tutorial for me as I am working on a course project that involves identifying objects (coins) and I am doing so using size. The measuring only worked on the first object on the left, and not measuring any other object in the pic.My guess here is that the other objects in the image were not properly detected.
The calibration card could help give real dimension and color to the photo for scale and color rectification? ( )Hi Adrian, first of all a pleasure to be in your page, well I have a doubt I hope you can help me clarify I do not understand where you say “Now, suppose that our object_width (measured in pixels) is computed be 150 pixels wide (based on its associated bounding box) ” We need to know (1) the size of the reference object in pixels and (2) the size of the reference object in actual, measurable dimensions. Double and triple-check that you have upgraded successfully. i read “Find distance from camera to object/marker using Python and OpenCV” article and then i have one question. I would also make sure that the camera you are using can read frames at a frame rate high enough to ensure you can (accurately) measure your objects. The height of both quarters are also off by So why is this? It’s a challenge and I’m restrained to webcams, though I can use other commonly available material. Maybe you’ll suggest something more optimal for round and ellipsoid objects like cells? Secondly, keep in mind that this method will return only external contours. It seems like the script only recognizes width to the certain extent. You can then loop over them and draw them with after executing the code I’m getting error of image required.. even after mentioning the path and Is there a need to import argparse if yes then plz do tell how to install it.It sounds like you are having problems with the command line arguments. How would you approach this problem?I would suggest looking into the intrinsic and extrinsic camera parameters which will allow you to obtain a much more accurate calibration.I am working on a project in which we need to input this height and width into another system which is already have been developed. It’s really interesting. Using haar cascade I was able to get the box co-ordinate of eye with which I found the centre position of eye, but how to exactly find the size of pupil? Light-Year - the distance light travels in one Earth year, equal to 9.46 x 10 12 km.
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