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2013-09-06 15:32:01 -0600 | asked a question | Is rotation vector from solvePnP() already roll, pitch and yaw? The output of solvePnP() is a rotation vector and a translation vector. My question: Is this rotation vector representing roll, pitch, yaw in (whatever X-Y-Z order or similar) fixed angle convention? I guess it is, but I want to have a confirmation on this. Thanks in advance. |
2013-07-16 11:08:13 -0600 | commented question | Computing attitude(roll, pitch & yaw) from solvePnP() @StevenPuttemans: Thanks for the information. I've appended the code snippet in the question. |
2013-07-16 04:51:06 -0600 | asked a question | Computing attitude(roll, pitch & yaw) from solvePnP() I am using solvePnP() to compute for attitude(roll, pitch & yaw). From solvePnP() I got the rotation vector and I use this to accordingly get roll, pitch and yaw. But the problem is when I rotate the camera 45deg, the measurement gives 25deg. I think, it might be that I need to integrate the angle value(each roll, pitch & yaw ) over time..am I right, integrating it will resolve the issue? Thanks in advance. EDIT The code snippet: pose[3] = -rot_vec.at(0); pose[4] = -rot_vec.at(1); pose[5] = -rot_vec.at(2); Note: pose[] is roll, pitch & yaw respectively & rot_vec is raw value of rotation vector obtained from solvePnP() |
2013-07-15 09:34:00 -0600 | commented question | How to use the results of solvePnP Did you get a solution already? Perhaps you can share how you have fixed it. |
2013-07-10 11:48:53 -0600 | commented question | Problem with OpenCV calibration module It's long ago, I hope still remember. Actually, you just need to define some parameters in the default.xml. There is an image list there that you can set. |
2013-05-24 05:15:39 -0600 | commented answer | Unit of pose vectors from solvePnP() But, I think the translation that outputted from solvePnP() is in pixel unit. |
2013-05-14 05:16:27 -0600 | commented answer | Unit of pose vectors from solvePnP() By looking at the output, I received something like "Translation: -224.111 -494.222 781.111", each for case in X, Y and Z. But, why is it too high if I would interpret in meters for example. If it's in mm, it makes a little bit sense. Also, why do you actually mean by "depends on the unit of the 3D points you us", I just define some 3D points that is nothing to do with actual unit of measurement? |
2013-05-13 11:52:17 -0600 | asked a question | Writing a video from image sequence I would like to know about how I can record(logic behind writing a video file) a video taking an input frame by frame. I know that I can use the functionality offered by VideoWriter class, but I am constrained from using that class because of some unavoidable reasons. Thanks in advance. |
2013-05-12 11:42:31 -0600 | asked a question | Unit of pose vectors from solvePnP() I would like to ask about the solvePnP() output of rotation and translation vectors. What is the unit of of them, are they radian & meter respectively? Thanks in advance. |
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2013-05-11 01:51:11 -0600 | asked a question | OpenCV/zxing image data structure in C++ What is OpenCV equivalent to zxing image data structure like: Or how do I convert from grey image of OpenCV(cv::Mat) to zxing's. Anyone familiar with OpenCV & zxing might want to help. Thanks in advance. |
2013-04-25 12:17:59 -0600 | asked a question | Compute pose using feature points How do I proceed once I have a feature points to compute pose estimation. For example, I guess I can use solvePnP(), but where to pass the feature points to the method. Also, what to pass to the first and second parameters(imagePoint and objectPoint)? Thanks in advance. |
2013-04-24 09:31:10 -0600 | asked a question | OpenCV functionality to visualize keypoints(corner) I am having a problem of visualizing keypoints(corners) generated from cv::goodFeaturesToTrack(). Is there something similar to cv::drawKeypoints that I can use. I've tried to use it but it didn't work. Thanks in advance. |
2013-04-24 08:47:25 -0600 | commented answer | Problem with OpenCV calibration module BTW, is it OK to use PNG images? or won't be compatible..I'm just curious.. |
2013-04-22 13:32:33 -0600 | commented answer | Problem with OpenCV calibration module It's now working out of the box taking into consideration your thoughts..thanks anyway. |
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2013-04-22 06:53:16 -0600 | commented answer | Problem with OpenCV calibration module With what you pointed out, I did it, but still getting the re-projection error about 4.44602, which is pretty high. |
2013-04-22 06:43:42 -0600 | commented answer | Problem with OpenCV calibration module Is that really mandatory to set "The size of a square in some user defined metric system (pixel, millimeter)", in the XML config file? I leave it as 50, how to benefit from it? |
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2013-04-22 06:16:20 -0600 | commented answer | Problem with OpenCV calibration module Regarding "It seems that problem "2" and "3" will be solved if you manage problem number one.", why is it complained in the first place, not even trying to take the recorded video input. |
2013-04-22 06:04:40 -0600 | commented answer | Problem with OpenCV calibration module Thanks for the answer, what do you mean by "Also be carefull about the condition of photographing, they should be the same, specially 'Focal Lengths' and 'Resolution'"? Do you mean while recording the video or image sequences, I should be using the same camera and with fixed lighting condition? |
2013-04-22 03:27:10 -0600 | edited question | Problem with OpenCV calibration module I have been spending some time to get my camera calibration working using OpenCV module as documented here. In particular, I have 3 questions regarding this issue:
Thanks in advance. |