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Nokia Telecom Application Server TAS and a cloud-native programmable core will give operators the business agility they need to ensure sustainable business in a rapidly changing world, and let them gain from the increased demand for high performance connectivity. Thanks for your help. In that case, simply apply cv2. The number of contours returned will be the total number of objects in the image. Very nice,good to read and made easy to understand. Why not just flip the image via cv2.
Hi Adrian, Can i find the largest contour area from many contours in a frame from a video. Eg: If there are 3 circles: left, middle and right, if left is having more area than other 2. Iam using Rpi3 python and opencv. I would suggest sorting your contours and maintaining a list of x, y -coordinates for each ball. A dequeue data structure like in this post would be really helpful. From there, monitor the x, y -coordinates in the dequeue. If there is a lot of variation, you know the ball is moving.
We are about to use the formula for ellipse to get the area of the object, and the centroid to identify the axes needed. However, we are not sure if there is an available code in java for this. Thank you! You would need to port the code to Java yourself. Hey Aadil — you do not need to modify the code at all if you are using command line arguments. If you want to skip command line arguments you should hardcode the path to cv2. Hi — how would you deal with having a light gray background with other colored objects red, orange?
It sounds like the color threshold parameters need to be tuned a bit. You would need to define a color threshold range for each color you wished to detect. Hi, Adrian! Your post is great! And the code is : ap. Hey Jason — the issue is that you are not correctly providing the command line arguments to the script.
Please take a look at this post for more details. Hi, I am trying to find centroid for moving object in that I am facing difficulty. Can any one please help me in that?? What object are you trying to compute the centroid of? How can i get centroid rectangle -centroid circle value in this code.
Your help may be appreciated. See this blog post on shape detection. Once you know the name of the shape you can compute the centroid for each and subtract. Dose it relate to the color of background? The code assumes that white is foreground and black is background. Hi Adrian, first of all let me say the way you explain things is amazing. Congratulations for the fantastic job. I have one question for you. The problem I still face though is that, even if the code captures most of the objects shapes it does also capture shapes that are purely words next to each other.
Is there anything I could do to avoid this behaviour? There are a few ways to approach the problem but I would suggest inspecting the gradient magnitude representation of the image like I do in this tutorial. You can use that representation to filter out text vs. Or you can click the active window opened by OpenCV and then hit any key on your keyboard to advance the execution of the script. Make sure you read this tutorial. Hey, Adrian! Great job!
How can I find height and width of each elements or for one of them? See this tutorial. You need to supply the command line arguments to the script. Thanks you for sharing well documented post with us. I like the way you explain code line by line.
I am following you since my college time and even today your posts are helpful to me in my company.. Keep it up. If possible please consider supporting the blog if you can. Thank you for this code! I am super new to programming but am learning image processing for school. Any advice on alternate code to use? Start by reading this tutorial on command line arguments.
Hi Adrian and and the community! Thank you for providing such great contents andso much tutorial!! I installed pyton 3 and opencv4 following your tutorial and then I started this tutorial. Any explanations about this? Great post, thanks. Any ideas on how to compute the CoG for a non-integer contour?
It seems that cv2. Any idea why? Thanks a lot. My question is how i can find centroid of contours in a video? I used the same codes but cannot find centroid in a video, can you help me please?
If you have a copy of Practical Python and OpenCV, make sure you refer to the chapters where I show you how to access the video stream. From there you apply your contour detection to each frame of the video stream and then compute the center of the countour. While I love hearing from readers, a couple years ago I made the tough decision to no longer offer help over blog post comments.
I simply did not have the time to moderate and respond to them all, and the sheer volume of requests was taking a toll on me.
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