Questions - OpenCV Q&A Forum

262

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3

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2013-12-11 18:36:55 -0600 xaffeine

How were the stock face detectors trained/tested?

140

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2014-04-13 16:09:46 -0600 techlearner

How to calculate False Accept and Reject Rates in pattern recognition?

deleted

9k

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no

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2019-02-09 02:25:07 -0600 joe_jetson

Getting x,y coordinates from an object in a video

222

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2019-10-14 13:06:41 -0600 just2read

ccalib, Multi Camera Calibration allways to few points

300

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2016-11-02 16:09:37 -0600 Liron Taub

OpenCV android projectPoints - Assertion failed

android

1k

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2016-10-25 18:19:05 -0600 kasparov092

Installation on Ubuntu 16.04 with Anaconda for python 3.5

175

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-1

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2014-07-04 15:13:42 -0600 Paul Jurczak

Support for RG1G2B channels

2k

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2013-07-06 06:33:30 -0600 Gibtnix

Problems with OpenCV 2.4.5 and MonoDevelop

1k

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2016-03-09 05:18:38 -0600 iko79

Setting VideoCapture resolution fails

videocapture

349

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2019-02-08 08:24:06 -0600 bear

count objects & polygons opencv.js

15k

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2015-05-19 03:51:08 -0600 shruti.arya

undefined reference to `cv::fastFree(void*)' & 'cv::Mat::deallocate()'

97

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2019-06-16 11:41:57 -0600 Dattatray

Need help to select tool to learn computer vision,having C++ experience.

tools

85

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2016-04-26 10:55:44 -0600 sotiraw

why Opencv with Qt cmd remains after actual opencv window is closed

qt
opencv

90

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no

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2016-06-23 04:18:25 -0600 RohanS

I am doing camera calibration and the camera matrix i get has a huge value of camera constant(10^4).Is this normal??.

calibrateCamera

264

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2017-07-10 21:19:02 -0600 hoang anh tuan

Not able to get frame from the second run (OpenCV on Rasbian)?

286

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2018-10-06 09:56:05 -0600 jasper12

are these algorithm to OpenCV API function conversions correct?

26k

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2020-05-13 13:43:14 -0600 aviramPi

openCV connect and process an ip camera stream (rtsp protocol)

3k

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no

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2018-10-19 03:59:51 -0600 erlendhade

Cmake build error OpenCV 3.4.0

282

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2014-08-20 15:35:22 -0600 giza

Error building openCV - dumpOpenCLDevice() method error

212

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2019-08-25 04:08:32 -0600 Crazy Sage

Problem with OpenCV and MinGW 7.3.2

403

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no

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2017-02-17 08:46:15 -0600 Aeroclassics

HOG Getting an Assertion

funny

364

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2019-11-12 11:51:53 -0600 postlude

Identifying and tracking drinks bottles in OpenCV without machine learning

688

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1

vote

2015-12-24 07:39:12 -0600 Momo

the largest circle in palm contour

843

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no

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2015-05-18 07:07:45 -0600 begueradj

Unable to stop the stream: Bad file descriptor

285

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2020-06-22 14:38:35 -0600 Alice_aj

Relative translation - Aruco

558

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no

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2019-01-06 02:38:09 -0600 berak

Segmentation fault

c++
opencv

3k

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no

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2016-06-24 12:26:59 -0600 kaylee frye

How do I switch between versions of OpenCV?

multiple-versions

265

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answers

1

vote

2014-03-17 09:58:28 -0600 GilLevi

Trouble In running a new algorithm I've added to OpenCV

484

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no

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2019-11-30 11:19:34 -0600 Kitnos

Knn for keypoints and descriptors of SIFT

207

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no

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no

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2017-07-10 12:17:41 -0600 gfx

12,357 questions

How were the stock face detectors trained/tested?

How to calculate False Accept and Reject Rates in pattern recognition?

Getting x,y coordinates from an object in a video

ccalib, Multi Camera Calibration allways to few points

OpenCV android projectPoints - Assertion failed

Installation on Ubuntu 16.04 with Anaconda for python 3.5

Support for RG1G2B channels

Problems with OpenCV 2.4.5 and MonoDevelop

Setting VideoCapture resolution fails

count objects & polygons opencv.js

undefined reference to `cv::fastFree(void*)' & 'cv::Mat::deallocate()'

Need help to select tool to learn computer vision,having C++ experience.

why Opencv with Qt cmd remains after actual opencv window is closed

I am doing camera calibration and the camera matrix i get has a huge value of camera constant(10^4).Is this normal??.

Not able to get frame from the second run (OpenCV on Rasbian)?

are these algorithm to OpenCV API function conversions correct?

openCV connect and process an ip camera stream (rtsp protocol)

Cmake build error OpenCV 3.4.0

Error building openCV - dumpOpenCLDevice() method error

Problem with OpenCV and MinGW 7.3.2

HOG Getting an Assertion

Identifying and tracking drinks bottles in OpenCV without machine learning

the largest circle in palm contour

Unable to stop the stream: Bad file descriptor

Relative translation - Aruco

Segmentation fault

How do I switch between versions of OpenCV?

Trouble In running a new algorithm I've added to OpenCV

Knn for keypoints and descriptors of SIFT

C++ opencv3 no ideas how to divide these thresholded image

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