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2018-07-21 02:27:21 -0500 commented question MASSIVELY slow transfer between GPU and host memory

However for a real solution you want to take a look at https://www.cs.cmu.edu/afs/cs/academic/class/15668-s11/www/cuda-d

2018-07-21 02:21:39 -0500 commented question MASSIVELY slow transfer between GPU and host memory

Iam sorry, but that is beyond my knowlege. All I can say is that you want to pipeline your code in a manner that upload,

2018-07-20 09:53:29 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:52:39 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:52:34 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:52:20 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:52:01 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:50:13 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-20 09:49:37 -0500 commented question MASSIVELY slow transfer between GPU and host memory

There is something available in OpenGL which allows you upload textures asynchronously called PBO see http://www.songho.

2018-07-18 06:24:08 -0500 commented question Why is threading slowing down over time?

So can you explain me what Iam getting wrong?

2018-07-18 06:18:39 -0500 commented question Why is threading slowing down over time?

I don't think so. From the context I clearly understand that internal parallelism (TBB) is only supported in a "may be a

2018-07-18 06:17:43 -0500 commented question Why is threading slowing down over time?

I don't think so. From the context I clearly understand that internal parallelism (TBB) is only supported in a "may be a

2018-07-18 05:33:49 -0500 commented question Why is threading slowing down over time?

"OpenCV philosophy here is that application should be multi-threaded, not OpenCV functions." - http://answers.opencv.org

2018-07-18 03:21:19 -0500 commented question Why is threading slowing down over time?

@berak this is not the problem. First only one thread is interfering with any cv context at the same time. Second the pe

2018-07-17 23:33:39 -0500 commented question MASSIVELY slow transfer between GPU and host memory

I made the same ovservations in OpenGL using a RX550 vs Intel iGPU. The texture upload on the RX550 is SLOWER than on th

2018-07-17 22:57:37 -0500 commented question Why is threading slowing down over time?

The are only 2 threads active at the same time. thread t is getting destroyed after each loop.

2018-07-17 13:26:33 -0500 received badge  Citizen Patrol (source)
2018-07-17 09:22:51 -0500 edited question Why is threading slowing down over time?

Why is threading slowing down over time? If I run the following sample code the calls getting slower and slower: #inclu

2018-07-17 09:18:04 -0500 asked a question Why is threading slowing down over time?

Why is threading slowing down over time? If I run the following sample code the calls getting slower and slower: #inclu

2017-11-20 05:11:42 -0500 commented answer Remove defects from round object

Thank you a lot, I was able to recreate your steps and got a much better resut now. My mistake was it to redraw the cont

2017-11-20 05:10:01 -0500 commented answer Remove defects from round object

Thank you a lot, I was able to recreate your steps and got a much better resut now. My mistake was it to redraw the cont

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2017-11-20 05:09:13 -0500 marked best answer Remove defects from round object

Hello everyone, I want to extract the inner circle like structure from this preprocessed image:
image description This is my best result so far (Green = Fitted Ellipse):
For the result above i used:
dilate -> findContours -> only keeping the second largest minAreaRect -> fitEllipse
For my needs the fitted ellipse is not precise enough. What i tryed already:

  • approxPolyDP: Either way it fails to detect part of the inner "circle" or it includes a lot of the defects
  • HoughCircles: The structure Iam looking for is just round but not a real circle, so it's way to unprecise
  • convexHull: Deforms the "circle" way to much
  • contourArea: Tryed to remove some of the blobs due to their small size but since lines have a small area aswell it didn't work

The perfect result (created by hand) the green part: image description

Any ideas how to get closer to this result?

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2017-11-20 05:09:11 -0500 commented answer Remove defects from round object

Thank you a lot, I was able to recreate your steps and got a much better resut now. My mistake was it to redraw contours

2017-11-20 04:13:57 -0500 commented question findcontours implementation

Since OpenCV is opensource you could a look at contours.cpp and canny.cpp for edge detection.

2017-11-20 03:57:32 -0500 edited question Remove defects from round object

Remove defects from round object Hello everyone, I want to extract the inner circle like structure from this preprocesse

2017-11-20 03:47:31 -0500 edited question Remove defects from round object

Remove defects from round object I want to extract the inner circle like structure from this preprocessed image: This

2017-11-20 03:42:47 -0500 edited question Remove defects from round object

Remove defects from round Object I want to extract the inner circle like structure from this preprocessed image: This

2017-11-20 03:41:02 -0500 received badge  Editor (source)
2017-11-20 03:41:02 -0500 edited question Remove defects from round object

Remove defects from round Object I want to extract the inner circle like structure from this preprocessed image: This

2017-11-20 03:39:46 -0500 asked a question Remove defects from round object

Remove defects from round Object I want to extract the inner circle like structure from this preprocessed image: This

2017-11-20 00:01:16 -0500 received badge  Enthusiast
2017-11-12 01:57:18 -0500 commented question Speed up Java loop

As I wrote, I tryed Imgproc.cvtColor() but the further processing result was bad. I really need max(R, G, B). However I

2017-11-11 23:39:55 -0500 asked a question Speed up Java loop

Speed up Java loop So i have the following code to convert a color image to a grayscale one with a custom grayscale algo