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2014-01-13 05:50:11 -0600 | commented answer | How to create and read image using open CV It's seems you beginner in programming, if you can't to implement a loop like for x {for y} |
2014-01-11 04:01:09 -0600 | answered a question | How to create and read image using open CV cv::Mat img(400, 400, CV_8UC3); // fill by white img = cv::Scalar(255, 255, 255); // change the pixel int x = 50; int y = 100; img.data[(y * img.size().width + x) * 3] = 0; // r img.data[(y * img.size().width + x) * 3+1] = 0; //g img.data[(y * img.size().width + x) * 3+2] = 0; //b // write cv::imwrite("myimg.png", img); // open cv::Mat opened = cv::imread("myimg.png"); cv::imshow("opened", opened); cv::waitKey(0); |
2013-12-20 08:41:55 -0600 | commented question | Filtering matches by keypoint coordinates distance - is not the distance between 2d points. It is Euclidean distance between descriptors of two points. |
2013-12-18 09:07:40 -0600 | commented question | Using solvePnP to work out the pose of my camera in terms of my model's coordinates solvePnP returns book's translation and rotation in camera coordinate system. You can use it for model rendering. Look here to know how http://answers.opencv.org/question/23089/opencv-opengl-proper-camera-pose-using-solvepnp/?answer=23123#post-id-23123 |
2013-12-17 05:21:05 -0600 | asked a question | Pattern recognition and pose estimation Hi. I working for augmented reality application. For pattern recognition i use next pipe:
But it's pipeline works fine only for small distances and not "hard" angles. Is there the better approach for pose estimation? Is there additional capabilities for pattern recognition, when it flat? |
2013-11-26 04:53:20 -0600 | commented question | buildOpticalFlowPyramid yes, it's normal. When set flag withDerivatives, output vector size = purCount * 2 |
2013-11-26 04:31:16 -0600 | asked a question | buildOpticalFlowPyramid Is this normal, that when i build pyramid with level = 4, function creates vector <mat> with size = 8? It's sample code. Here size of each mat D/CMarkerlessRecognitionStrategy(32362): size: 432 240 D/CMarkerlessRecognitionStrategy(32362): size: 432 240 D/CMarkerlessRecognitionStrategy(32362): size: 216 120 D/CMarkerlessRecognitionStrategy(32362): size: 216 120 D/CMarkerlessRecognitionStrategy(32362): size: 108 60 D/CMarkerlessRecognitionStrategy(32362): size: 108 60 D/CMarkerlessRecognitionStrategy(32362): size: 54 30 D/CMarkerlessRecognitionStrategy(32362): size: 54 30 |
2013-11-22 07:17:01 -0600 | asked a question | solvePnPRansac returns different results Hi, i use solvePnPRansac function in in Android application in native. With identical input parameters it returns different results (rvec, tvec and status) Can this appears or i have memory corruptions? |
2013-11-18 02:47:23 -0600 | commented question | knn matcher fails maybe you have not enough memory? |
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2013-11-13 05:47:23 -0600 | asked a question | OpenCV for Android Hi. Is there any reason for use OpenCV for Android instead of native library via JNI? |
2013-11-04 07:06:37 -0600 | commented answer | Find point coordinate in a projected rectangle you also can apply matrix P to point F using perspectiveTransform() function |
2013-11-04 07:02:44 -0600 | commented question | how to make two images only different from the brightness become the same Try to convert images to HSV color model and subtract only H channel |
2013-10-22 07:15:54 -0600 | asked a question | calcOpticalFlowPyrLK alternatives Hi. I use calcOpticalFlowPyrLK function for pattern tracking for my Augmented Reality application. It's very fast and stable, but i found, that Pyramid Optical Flow is not rotation invariant. Is there alternative methods with the same speed? I tried calcOpticalFlowFarneback, but it is not fast enough |
2013-10-15 13:30:33 -0600 | commented question | calcOpticalFlowPyrLK. Use pyramids instead of Image I solve this problem. It's cause i used OpenCV 2.4.0. This feature is available in version >= 2.4.5 |
2013-10-15 05:50:08 -0600 | asked a question | calcOpticalFlowPyrLK. Use pyramids instead of Image I try to use built pyramids in the calcOpticalFlowPyrLK function, but it wrote "Assertion failed (0 <= i && i < (int)v.size())" Why it doesn't want? Documentation says prevImg – first 8-bit input image or pyramid constructed by buildOpticalFlowPyramid(). |
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2013-08-08 09:15:29 -0600 | asked a question | cvFindExtrinsicCameraParams2 strange behaviour I use cvFindExtrinsicCameraParams2 function for determinate rotation matrix and translation vector. My question is why this appears and how can i solve it? |
2013-08-07 15:18:00 -0600 | answered a question | Opencv configuration with Qt on windows If you want to add opencv libraruies in your Qt project, you must do next
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2013-08-06 14:29:39 -0600 | answered a question | OpenCV Assertion Failed for Perspective Transform. Your must be CvType.CV_32FC2 Its a points 2d, that's why they have 2 (x,y) coordinates. |
2013-08-05 02:52:33 -0600 | commented answer | Kalman filtration for rotation Thank you, i know this, but quaternion components also interdependent. I found this article (http://www.malcolmdshuster.com/pub_1993f_c_qnorm_mds.pdf), maybe it will be helpful for me but i hoped to find the easyest solution |
2013-08-05 02:18:54 -0600 | asked a question | Kalman filtration for rotation I want to use Kalman filter for rotation. I have rotation matrix, but i can't use filtration for it, because all it's elements interdependent. That's why i try to convert matrix to euler angles and to filter each of compoments. My questions:
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2013-08-03 08:15:56 -0600 | commented answer | opencv_core246d.dll is not in your computer Take your opencv_core246d.dll and copy it to folder, where lies your executed file. For example, i take opencv_core246d.dll here C:\OpenCV\opencv\build\x64\vc10\bin and copy in VS project debug folder C:\Users\pc\Documents\Visual Studio 2010\Projects\opencv_test\Debug It's easiest way |
2013-08-02 13:12:39 -0600 | answered a question | opencv_core246d.dll is not in your computer You have 2 variants: |
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2013-07-31 08:49:29 -0600 | commented answer | cv::Rodrigues problem The ansver is simple: Rotation vector - is not an Euler Angles. |
2013-07-31 04:12:50 -0600 | commented question | Assertion Failed when using FREAK and BFMatcher in real time |
2013-07-31 03:17:55 -0600 | answered a question | Android application to recognize and track object from camera has more false positives? You should check if the keypoints were found Your matchesList must be checked also |
2013-07-31 03:10:10 -0600 | commented question | Assertion Failed when using FREAK and BFMatcher in real time Are you sure that the images are opened? |
2013-07-31 03:04:13 -0600 | asked a question | OpenCV calibrateCamera function question
I want to use simple artoolkit marker to calibrate my device. Whan i found marker, i have 4 image points and 4 object points (corners of a square). I use calibrateCamera function for my 4 points to try to get intrinsic parameters. But received focals have too big amplitude (if my real fx = 960, it can calculates as 500 and 3000) Okay, maybe marker too small (hence the large error of calculation) or four points is too few. I try to use CV_CALIB_USE_INTRINSIC_GUESS flag, and give the initial approximation of intrinsic parameters. But output matrix is absolutely dependent of initial approximation. It means, that if i give it fx = 500, it's returns fx = 500 +/- 20, if i give it 2000, it returns 2000 +/- 20 Here my questions
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2013-07-31 01:39:23 -0600 | commented question | Create a colored image from CMYK grayscale images You can call mat.data attribute to get uchar* from cv::Mat |
2013-07-30 15:41:38 -0600 | commented question | Create a colored image from CMYK grayscale images I don't know the best way, but maybe this source will be helpful for you https://code.ros.org/trac/opencv/changeset/564/trunk/opencv/src/highgui/utils.cpp if you will not find the better decision |
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