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2017-09-14 11:33:07 -0500 marked best answer Convert haarcascade to LBP

Is it possible to convert haarcascade to LBP and how?

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2015-03-23 05:30:34 -0500 received badge  Popular Question (source)
2014-12-08 22:00:36 -0500 asked a question How to rotate translation vector?

I get camera assembled on copter and I want to know camera position in coordinate system related with ground. I obtained rotation and translation vectors by SolvePNP function. But those coordinates related with copter. Is I need to rotated translation vector? I how to do it?

2014-10-24 03:20:01 -0500 asked a question Does OpenCV OpenCL acceleration work with Intel HD 4000 or 5000 on Linux?

Who had experience with running OpenCL on Intel HD on Linux?

2014-09-22 08:03:47 -0500 commented answer How to detect concentric squares?

I througth about it. But if view angle is too big squares turn into quads and can not be decribed by RotatedRect. But I'll try and let you know.

2014-09-22 07:56:33 -0500 commented answer How to detect concentric squares?

I thought about it. But if view angle is too big, squares turn into quads and cannot be described as RotatedRect. But I will try and let you know.

2014-09-22 06:04:08 -0500 asked a question How to detect concentric squares?

I have vector of approximated 4-point closed contours. How I can determine that some of them are concentric? image description

2014-09-04 08:19:18 -0500 commented question ubuntu compilation error with 2.4.5

Unless thus are not need to android build?

2014-09-04 06:54:21 -0500 commented question ubuntu compilation error with 2.4.5

>-- Could NOT find JNI
Maybe you need to install Java JNI?

2013-09-19 05:31:01 -0500 asked a question Is contour has self-intersections

How to know it and is it possible to count them?

2013-06-17 12:43:01 -0500 answered a question pattern recognition to detect object position ?

If you have approximately flat object to recognize, see sample

2013-06-17 04:03:46 -0500 commented question OpenCV Webcam

Which version of OpenCV you are using? You code works fine on Linux 3.5.7-gentoo with OpenCV 2.4.5

2013-06-16 03:13:51 -0500 commented question OpenCV Webcam

Can you specify you system, opencv compilation flags, source code, camera model and error?

2013-06-12 14:37:24 -0500 commented question ***Background separation of video stream by using static background image***

May be I do not fully understand your question, but what does mean "using static background image"? If your already have it, why you need to separate it?

2013-06-04 03:36:37 -0500 asked a question image set for structures from motion

Where I can find image set to training to reconstruct 3D-model?

2013-05-26 11:56:16 -0500 asked a question Compilation problem with Qt in trunk version

I think it's related to support for qt5 in a recent commits

In file included from /var/tmp/portage/media-libs/opencv-9999/work/OpenCV-9999/modules/highgui/src/window_QT.cpp:46:0:
/var/tmp/portage/media-libs/opencv-9999/work/OpenCV-9999/modules/highgui/src/window_QT.h:81:17: fatal error: QTest: No such file or directory

Is it trunk version problem or only my?

Linux machine 3.5.7-gentoo #2 SMP

2013-05-17 11:03:01 -0500 received badge  Scholar (source)
2013-05-17 07:16:02 -0500 asked a question How to obtain projection matrix?

I have translation, rotation and camera matrices for two camera. How I can obtain two projection matrices for them?

2013-05-06 13:59:01 -0500 asked a question Determine object world coordinate by two or few cameras

I calibrated two cameras and i know it extrinsic parameters, how i can determine world coordinate of object by two frame from them?

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2013-03-30 04:39:22 -0500 commented answer image pattern recognition

I get some results with SURF and FLANN, but i want to try some machine learning like k-nearest instead of them, where i can find good tutorial to train and use k-nearest algorithm for planar image recognision?

2013-03-25 15:18:54 -0500 commented answer image pattern recognition

@Guanta, i try to use SURF, but it gave too many false point matches, it is possible to get roi mask by some other alghorithm?

2013-03-23 07:38:05 -0500 asked a question image pattern recognition

What do you think, what alghoritms developers used in this video, why it so perfect?

2013-03-13 07:10:47 -0500 commented question in stereo matching is the disparity always to the left?

Can you post some of the image pairs?

2013-02-17 11:15:13 -0500 asked a question GMG background subtractor opencv realisation

I read "Visual Tracking of Human Visitors under Variable-Lighting Conditions for a Responsive Audio Art Installation", A. Godbehere, A. Matsukawa, K. Goldberg, American Control Conference, Montreal, June 2012.

But i cannot find Filtering and Connected Components, Gale-Shapley Matching or Heuristic Confidence Model realizations in bgfg_gmg.cpp. What's wrong?)

2013-02-17 03:48:35 -0500 answered a question Measuring performance of OpenCV functions

You can use some profiler or getTickFrequency

2013-01-26 04:19:03 -0500 answered a question Align stereo images taken from one camera

I think you can use Structure from motion technic, for example

2013-01-24 03:25:04 -0500 commented question Align stereo images taken from one camera

What the horizontal align you want if you move your camera at 10 cm?

2013-01-09 09:25:18 -0500 answered a question Calculating distance from the pixel value of a disparity map

Why reprojectImageTo3D is not suitable?

2012-12-14 13:40:44 -0500 commented question OpenCV 2.4.3 VideoCapture not working on *.avi file input

add capture.isOpened() assert

2012-12-14 13:35:18 -0500 commented question I cant access my webcam Opencv 2.4.3

use <pre> tag to format you question

2012-12-14 13:25:28 -0500 commented question I cant access my webcam Opencv 2.4.3

run lsusb and ls /dev/video*

2012-11-21 06:46:47 -0500 received badge  Critic (source)
2012-11-20 17:32:25 -0500 answered a question From 3d point cloud to disparity map

I think you can calculate distance between point cloud and it projection to plane, multiply by proper factor and obtain your disparity point.

2012-11-18 08:39:45 -0500 answered a question cv::waitKey() upper-/lowercase difference

As i know key code return qt, not OpenCV, try to set it up, i have some strange result too at once.