Questions - OpenCV Q&A Forum

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2019-12-21 22:34:30 -0600 HelloWorld

SVM predict error error: (-215:Assertion failed) samples.cols == var_count && samples.type() == CV_32F in function 'predict' [closed]

cv2.ml_SVM

466

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1

answer

-1

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2019-12-22 13:07:46 -0600 berak

OpenCV C++ for decision tree based problems.

decision_tree

499

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1

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no

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2019-12-21 12:25:55 -0600 supra56

Can anyone please help me in detection of the pins?

opencvC++

328

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2019-12-20 19:39:56 -0600 abraham1798

Change webcam to an usb cam in Rviz [closed]

145

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2019-12-20 14:42:35 -0600 supra56

projectPoints shows wierd results

c++#opencv

109

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2019-12-20 12:07:29 -0600 danfur

Changes made to getRotationMatrix2D() in version 4.1.2?

getRotationMatrix2D

244

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1

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2019-12-20 12:03:03 -0600 B. Bogart

pretrained model for gaze / frontal face detection for cv::dnn?

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2019-12-26 15:10:38 -0600 hernancrespo

How to plot histogram of an area inside a contour [closed]

261

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no

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2019-12-20 10:40:29 -0600 exbigboss

[C++] Using DNN with Tiny Yolo v2, not getting 13x13 (just 125 x 1)

dnn
yolov2

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2019-12-20 03:29:23 -0600 infant_batman

Errors while building customised ffmpeg4.1 with libopencv_highgui-dev

254

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2019-12-19 18:25:25 -0600 supra56

How to draw contours on squares drawn with pencil (Python)

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2019-12-20 07:18:13 -0600 dslove

Not able to use openCL on Mac

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2019-12-19 09:07:29 -0600 Dimitar Veljanovski

How do I make a 3D map of ORB keypoints using 1 camera

152

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no

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2019-12-19 09:03:01 -0600 supra56

yolov3 optimized by model optimizer fail to do inference

375

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2019-12-19 03:35:33 -0600 ramthota

enable VFPV4 for ARM v8

c++opencv

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2019-12-19 03:15:42 -0600 ibrahim_5403

How can I convert keras model (.h5) into tensorflow (.pb) model to use in opencv DNN module?

99

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1

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2019-12-18 15:14:27 -0600 flyingfishfinger

Larger scaling numbers result in white frames (?) [closed]

147

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no

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2019-12-18 13:12:46 -0600 chnbr

detectMultiScale(...) internal principle ?

detectMultiScale

1k

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1

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no

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2019-12-19 08:38:28 -0600 Ben470

Convert pixel to points in world coordinates

883

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3

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no

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2019-12-30 03:36:01 -0600 Gandalf2019

cv::cuda::convolve artifacts

185

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2019-12-18 11:04:37 -0600 heisenburg007

Get video input when device not on uvc input

469

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2019-12-18 08:39:29 -0600 supra56

Kalman filter predict both velocity and position

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2019-12-18 02:03:35 -0600 tsameema

Error in backgroundSubtractorMOG_

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2019-12-17 23:27:22 -0600 clefrks

error: (-215:Assertion failed) !_img.empty() in function 'imwrite [closed]

153

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1

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no

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2019-12-18 01:22:40 -0600 mvuori

cv::Mat_ compiling error

VC15
Mat_

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2019-12-17 21:43:08 -0600 sid311

How to specify IPP version with CMake for versions 4.1.2/4.2.0?

IPP
lippicv

4k

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2019-12-17 20:33:22 -0600 ChanKim

ubuntu 16.04, "VIDEOIO(V4L2:/dev/video0): can't open camera by index" after software update

camera

509

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2019-12-17 10:21:25 -0600 UU_KK

Opencv 3.4.8 + Opencv contrib 3.4.8 + mingw32-make + ERROR while compiling(libopencv_hdf348.dll))

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2019-12-17 06:49:27 -0600 AlexB

Should I use `pkg-config --libs opencv4` or `pkg-config --libs opencv`?

2k

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1

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no

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2019-12-17 07:59:08 -0600 kbarni

29,830 questions

SVM predict error error: (-215:Assertion failed) samples.cols == var_count && samples.type() == CV_32F in function 'predict' [closed]

OpenCV C++ for decision tree based problems.

Can anyone please help me in detection of the pins?

Change webcam to an usb cam in Rviz [closed]

projectPoints shows wierd results

Changes made to getRotationMatrix2D() in version 4.1.2?

pretrained model for gaze / frontal face detection for cv::dnn?

How to plot histogram of an area inside a contour [closed]

[C++] Using DNN with Tiny Yolo v2, not getting 13x13 (just 125 x 1)

Errors while building customised ffmpeg4.1 with libopencv_highgui-dev

How to draw contours on squares drawn with pencil (Python)

Not able to use openCL on Mac

How do I make a 3D map of ORB keypoints using 1 camera

yolov3 optimized by model optimizer fail to do inference

enable VFPV4 for ARM v8

How can I convert keras model (.h5) into tensorflow (.pb) model to use in opencv DNN module?

Larger scaling numbers result in white frames (?) [closed]

detectMultiScale(...) internal principle ?

Convert pixel to points in world coordinates

cv::cuda::convolve artifacts

Get video input when device not on uvc input

Kalman filter predict both velocity and position

Error in backgroundSubtractorMOG_

error: (-215:Assertion failed) !_img.empty() in function 'imwrite [closed]

cv::Mat_ compiling error

How to specify IPP version with CMake for versions 4.1.2/4.2.0?

ubuntu 16.04, "VIDEOIO(V4L2:/dev/video0): can't open camera by index" after software update

Opencv 3.4.8 + Opencv contrib 3.4.8 + mingw32-make + ERROR while compiling(libopencv_hdf348.dll))

Should I use `pkg-config --libs opencv4` or `pkg-config --libs opencv`?

How to remove the element attached to the image border?

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