First time here? Check out the FAQ!
Hi there! Please sign in
help
faq
tags
users
badges
This forum is disabled, please visit
https://forum.opencv.org
ALL
UNANSWERED
Ask Your Question
berak's profile - overview
overview
network
karma
followed questions
activity
32,993
karma
follow
Moderator
member since
2013-02-04 09:08:30 -0600
last seen
2020-12-17 02:58:16 -0600
todays unused votes
60
votes left
27
Questions
8k
views
2
answers
7
votes
2014-10-14 12:11:54 -0600
Eng Hind
Color constancy in different illumination condition
Color
constancy
836
views
no
answers
6
votes
2016-11-03 13:37:20 -0600
berak
moderation [closed]
moderation
4k
views
no
answers
3
votes
2015-02-15 08:44:46 -0600
berak
buildbot does not find xfeatures2d.hpp
Opencv3.0
opencv_contrib
1k
views
no
answers
3
votes
2013-07-31 04:53:17 -0600
berak
cv::reduce does not support int as src type
reduce
CV_32S
95
views
no
answers
3
votes
2013-10-08 12:33:20 -0600
berak
how to wrap a cv::Ptr to c (in 3.0) [deleted]
Ptr
3.0
C
1k
views
no
answers
2
votes
2014-09-07 06:46:06 -0600
berak
what is the purpose of the adas module ?
opencv_contrib
adas
864
views
1
answer
2
votes
2016-06-03 03:45:55 -0600
mshabunin
abi checks
github
contribute
abi
2k
views
1
answer
2
votes
2013-09-09 04:23:09 -0600
berak
ConDensation algo
condensation
15k
views
1
answer
2
votes
2013-05-25 04:33:50 -0600
berak
can't imread or imwrite in python
python
cv2
imread
imwrite
1k
views
no
answers
2
votes
2014-09-14 16:36:11 -0600
berak
how to train the new ICFDetector ?
ICFDetector
objdetect
3.0
opencv_contrib
« previous
1
...
1
2
3
...
3
next »
2976
Answers
11
How to perform TLD tracking on ROI bounding box using openCV c++ builtin methods ?
10
Draw lines from centroid of contour at given angle till edge of contour
10
Display image?
9
Detect cattle in drone video footage
9
load multiple images from a single folder
9
Sorting contours from left to right and top to bottom
8
How to find if 2 rectangles are overlapping each other
8
How to access data from a cv::Mat
7
waitKey(1) timing issues causing frame rate slow down - fix?
7
first example code error
« previous
1
...
1
2
3
4
5
...
298
next »
8863
Votes
5933
2930
50
Tags
opencv
× 4,872
c++
× 2,597
python
× 2,193
java
× 1,295
android
× 1,208
SVM
× 535
Mat
× 459
dnn
× 410
FaceRecognizer
× 344
error
× 342
image
× 337
Facedetection
× 296
cmake
× 287
videocapture
× 267
opencv_contrib
× 254
image-processing
× 240
Opencv3.0
× 238
detection
× 234
camera
× 227
build
× 226
imread
× 204
Video
× 201
SURF
× 201
deleted
× 195
cascadeclassifier
× 194
#opencv
× 186
HOG
× 180
face
× 175
windows
× 174
tracking
× 174
machinelearning
× 170
SIFT
× 167
CUDA
× 152
recognition
× 148
python3
× 145
install
× 138
opencv3
× 136
imshow
× 133
mingw
× 131
linux
× 130
ORB
× 127
c++#opencv
× 126
LBP
× 125
imageprocessing
× 122
compile
× 120
installation
× 120
computervision
× 120
training
× 118
ubuntu
× 117
contours
× 113
11
Ignored Tags
ios
mac
OSX
xcode
MacOSX
macos
Swift
objectiveC
Homebrew
apple
iOS-12
25
Badges
●
Enlightened
×
1
Access 32F Mat element by pointer
●
Popular Question
×
4
can't imread or imwrite in python
Color constancy in different illumination condition
buildbot does not find xfeatures2d.hpp
ConDensation algo
●
Commentator
×
1
Updating EigenFaceRecognizer with more faces
●
Guru
×
2
How to perform TLD tracking on ROI bounding box using openCV c++ builtin methods ?
Display image?
●
Great Answer
×
3
How to perform TLD tracking on ROI bounding box using openCV c++ builtin methods ?
Draw lines from centroid of contour at given angle till edge of contour
Display image?
●
Favorite Question
×
1
Color constancy in different illumination condition
●
Teacher
×
1
Needing for C++ tutorials for OpenCV
●
Citizen Patrol
×
1
●
Civic Duty
×
1
Resizing Image
●
Student
×
1
Color constancy in different illumination condition
●
Taxonomist
×
1
●
Notable Question
×
3
Color constancy in different illumination condition
can't imread or imwrite in python
buildbot does not find xfeatures2d.hpp
●
Supporter
×
1
FREAK compute() speed up
●
Critic
×
1
Error sending Iplimage using TCP
●
Famous Question
×
2
Color constancy in different illumination condition
can't imread or imwrite in python
●
Necromancer
×
4
Error sending Iplimage using TCP
how to understand which functions available in python bindings?
Compiling OpenCV 3.1doesn't put header files into include directory
WLD: A Robust Local Image Descriptor
●
Editor
×
1
Error sending Iplimage using TCP
●
Enthusiast
×
1
●
Disciplined
×
3
how to wrap a cv::Ptr to c (in 3.0)
Unable to get Mahalanobis distance
Graphical Implementations of OpenCV
●
Good Answer
×
67
Image is empty
Access 32F Mat element by pointer
Adding Matrices without saturation
Some problem about displaying a raw image file
How to access data from a cv::Mat
what's the meaning of '>' with Mat
OpenCV vs EMGU
Display image?
How to extract red color plane in OpenCV C++
Create a memory continuous cv::Mat, any api could do that?
Sorting contours from left to right and top to bottom
how to extract gabor feature using opencv?
[SOLVED] how to average N matrices into 1?
BOWKMeansTrainer in Python?
Non-free feature detectors in 3.0
uniform LBP - mapping using lookup table
Passing multiple parameters with the setMouseCallback function
waitKey(1) timing issues causing frame rate slow down - fix?
Problem on initialize FeatureDetector or DescriptorExtractor on OpenCV 3.0
Image Registration (OpenCV 3.0.0)
Draw lines from centroid of contour at given angle till edge of contour
createLBPHFaceRecognizer arguments grid_x and grid_y
Is there a way to save and restore trained neural network weights?
Contours radius unit
Missing createFisherFaceRecognizer method on android.
How to perform TLD tracking on ROI bounding box using openCV c++ builtin methods ?
How to perform Linear Discriminant Analysis with OpenCV
3.0 alpha missing nonfree package
Converting Mat img to one dimensional float array in C++ which is in row, column, channel order?
Problem with perspective
Detecting multiple squares within a square and extracting their coordinates
How to find if 2 rectangles are overlapping each other
subtract color from Mat
load multiple images from a single folder
making effective pull requests
line extration in opencv_contrib
Detect cattle in drone video footage
imshow() shows the image after scanf_s()
cv::fitline
Problem with Laplacian Filter
K means question
Sort bounding boxes in x- Axis of a image in order
How can Caffe be interfaced using OpenCV
HEP-histogram of equivalent patterns
<< operator
Partition() - Finding the number of Clusters
first example code error
PCA + SVM ?
Convert CV_8UC4 to CV_8UC3,in openCV4Android?
Deslant handwriting samples
How to remove green color i.e. to set it to 0 in an image?
CopyTo() and Clone() functions
How to use KNearest and ANN in OpenCV 3.0
c++ to Python Need help to help :)
Unsupported format or combination of formats in buildIndex using FLANN algorithm
How to initialize Mat size and fill it with zeros in a class ?
Is there a way to set new window position?
Imread returns a blank image for a certain file
C++ read rgb+depth images sequentially
Fingerprint Database
Finding Dominant colors in an image in c++
videwriter not working after image resize
Send/Receive vector <Mat> over Socket C/C++
Calculating sum using integral image
My contours smaller than a certain value are Not being removed from list of contours, despite of correct logic. Why?
additive Gaussian noise with different SNR
Identifying and selecting floor in a room
●
Nice Question
×
7
Color constancy in different illumination condition
cv::reduce does not support int as src type
how to wrap a cv::Ptr to c (in 3.0)
what is the purpose of the adas module ?
buildbot does not find xfeatures2d.hpp
can't imread or imwrite in python
moderation
●
Nice Answer
×
289
marker creation
Sort bounding boxes in x- Axis of a image in order
Opencv fails to capture click down early after previous
saving this value
loading an image
how to process tiff image
Image is empty
Access 32F Mat element by pointer
<< operator
Save Image Sequence real time
Why the image just disappears in the following code
CV_8UC3 pixel format question Update
Location of the headers moved?
OpenCV vs EMGU
cvCvtColor Crash?
Calculation on 16 bit images
How to extract red color plane in OpenCV C++
Some problem about displaying a raw image file
Adding Matrices without saturation
Problem converting Mat values to float
change the Height and Width of the image
Opencv sum()[]
count the pedestrian amoun from image
uniform LBP - mapping using lookup table
simple face recognition
How to access data from a cv::Mat
Save a vector<Mat> to a file and read it back in c++
Opencv Resize memory leak
Is there a way to save and restore trained neural network weights?
getting started.. I am lost, wheres the front door?
Display image?
finding a sub image in successive frames
cv::fitline
Pixel access through python interface
GitHub fetch latest source code to your forked repository
How to get the size or area of a contour upon touch
making effective pull requests
4 Cameras Simultaneously
Question mark behind local time
Help with Random Trees
How do I remove duplicate rows in cv::Mat?
Create a memory continuous cv::Mat, any api could do that?
Drawing rectangle OpenCV : don't understand a detail
neural network for pattern recognition examples
which class can show an image in java?
what's the meaning of '>' with Mat
calcHist() usage for RGB histogram...?
Calculating sum using integral image
opencv ReprojectImageto3D gives values tending to infinity
What's the difference between cv and cv2 using python2?
Clahe implemenation in java
how to derive from algorithm
How can I initialize Mat?
How to control a KalmanFilter using the Java interface ?
Code conversion in opencv C++
How can I normalize histogram?
Sorting contours from left to right and top to bottom
Matrix to single row
subtract color from Mat
how to appened the new faces into the xml file
Is videowriter API not functional in android?
BOWKMeansTrainer in Python?
Missing createFisherFaceRecognizer method on android.
HEP-histogram of equivalent patterns
Understanding cv::Mat
How can i show an image in opencv.
3.0 alpha missing nonfree package
how to extract gabor feature using opencv?
NormalBayesClassifier classifier is an abstract class
findcontours problem in vs2010
Unsupported format or combination of formats in buildIndex using FLANN algorithm
additive Gaussian noise with different SNR
Problem with Laplacian Filter
[SOLVED] how to average N matrices into 1?
Non-free feature detectors in 3.0
cv::xfeatures2d::SURF abstract?
Is FREAK still in OpenCV 3?
cv::Mat pointers
modify pixel of image with 0.01
does any one has a uniform lbp c++ code with it's spatial histogram
opencv3.0 xphoto missing
How to compile nonfree module in opencv 3.0 beta ?
pyopencv_from and pyopencv_to for KeyPoint class
How can i get a real random number?
object recognition using opencv without user interaction
How can i add all 'R' values in the image?
waitKey(1) timing issues causing frame rate slow down - fix?
How to perform TLD tracking on ROI bounding box using openCV c++ builtin methods ?
copy even rows/cols to another Mat
Missing opencv2/core/utility.hpp
How to use KNearest and ANN in OpenCV 3.0
Normalized standard deviation
Problem on initialize FeatureDetector or DescriptorExtractor on OpenCV 3.0
Image Registration (OpenCV 3.0.0)
Problem with perspective
Detecting multiple squares within a square and extracting their coordinates
createLBPHFaceRecognizer arguments grid_x and grid_y
Draw lines from centroid of contour at given angle till edge of contour
Enabling OpenMP while building OpenCV libraries
What is the deference between OpenCV2.4.10 and JavaCV 0.10
OpenCV-Python Tutorials page 404 not found
estimateRigidTransform( ) in Opencv 3.0.0
StereoBM in OpenCV 3 (Python) missing module
Contours radius unit
Opencv3.0 Shape Module, Compute Distance
Error building opencv with extra modules (ALL_build build errors)
OpenCV with QT cv::imread problem.
How to perform Linear Discriminant Analysis with OpenCV
Convert Mat to byte[] in C++
Converting Mat img to one dimensional float array in C++ which is in row, column, channel order?
Why I cant resize the image with the track bar?
Algorithm drawContours
Help with detecting a wrong video header giving wrong frame amount
How to find if 2 rectangles are overlapping each other
Trackbar callback as a member function
Getting error using SVM with SURF
Display IplImage in webbrowsers
K means question
Partition() - Finding the number of Clusters
How convert blob/binary data to Mat
load multiple images from a single folder
How to know if two Mat point to the same data?
Unable to get Mahalanobis distance
line extration in opencv_contrib
c++ to Python Need help to help :)
Detect cattle in drone video footage
How to load EM model using OpenCV android sdk V3.0.0
Signal processing to detect "jag-iness"?
element wise division in android
How can Caffe be interfaced using OpenCV
calculate distance using disparity map
imshow() shows the image after scanf_s()
CopyTo() and Clone() functions
No DLLs are installed with the OpenCV Installer
What is the alternative of getMat() of Facerecognizer class in opencv3.00 ?
OpenCV Free for Commercial use
improving poor blob contours
How to use InRange at Different Color Space and Range.
How to draw a circle on an image using mouse click/events?
first example code error
BRIEF descriptors in OpenCV 3
Conversion of 3 channel to 1 channel
How to implement filters ?
Graphical Implementations of OpenCV
I want to draw a line of points
video stabilization
What does OpenCV Python interface miss some key classes?
Memory error accessing grayscale pixel data
how to use CascadeClassifier::read?
Classification of Image
count number of peaks in histogram
How does opencv convert a bgr image to greyscale?
Obtaining Pixelvalue with various formats
KMeans Clustering for vector<Point2f> Data Structure
Does createLBPHFaceRecognizer() uses spatially enhanced histogram?
svm predict function always return a large number
I want to multiply a matrix with a number !
Convert CV_8UC4 to CV_8UC3,in openCV4Android?
how to find matching image
Fast element access macro in C++ API
Parallel implementation of per pixel calculations
goodFeaturesToTrack returns 2 channel image and can't be imshowed
Getting the matrix of Mat type image
How to implement K nearest neighbour
How to combine several features of a hand for machine learning
HoG Training Using SVM
SLIC error
How can i cluster moving objects in a video ?
Deslant handwriting samples
Can't get predict confidence
find all the colors of a given image and their pixel position
Compute Dense SIFT features in OpenCV 3.0
Measure the Length and Width of the bounding Box
Toy example using opencv 3.0 object in a custom class
My contours smaller than a certain value are Not being removed from list of contours, despite of correct logic. Why?
convert the RGB image to a grayscale representation of its redness
Cannot find additional libraries in openCV 3.1.0
Creating custom kernels
PCA + SVM ?
Trouble detecting hand drawn shapes
Construct Gabor Filters and Filter Image
Can we use Bag of Visual Words to compute similarity between images directly?
Opencv 3.1 DNN module in Contrib : How train a new model?
How to display output of reprojectImageTo3D ?
How to know what to #include for a given function ?
How to remove green color i.e. to set it to 0 in an image?
Is there a way to set new window position?
Error in making graphs in OpenCV
line scanning for the bar code
Bio-inspired features returns NaNs
HoughLinesP vastly different in Python and C++
how to compile forEach doc example?
How to initialize Mat size and fill it with zeros in a class ?
Cannot found openfabmap implementation in OpenCV repo
How do I install the old cv not cv2?! Python
Passing multiple parameters with the setMouseCallback function
reverse thresholding
I need to do image sequence after extracting frames.
How to calculate Euclidean Distance d(h,g)
How to pass 3D array to Mat ?
How to eliminate small contours in a binary image?
Matrix multiplication without memory allocation
What images to use for negative training data for SVM?
Put two or more frames in one output window
ORB Detector / ORB Extractor retrieve bad results
OpenCV 3.0.0, FaceRecognizer and Python Bindings
How to understand Mat_<float>
How to start with neural network implementation with Opencv and C++??
Face Landmarks and face identification
Cropping of images in c++ vs python
can we create a 5*5 kernel np array in c++
Finding Dominant colors in an image in c++
How to plot dotted line using OpenCV?
HOG optimal training images
how to get new center points in kmeans
cv2.imshow and cv2.imwrite show different output from the same array[SOLVED]
Which options are set in a prebuilt OpenCV library?
SVM model fails to load!
OpenCv 3.4.0 FaceRecognizer was removed?
Any tool for cropping positive samples
How do I convert uint8 to CV_8UC1 in OpenCV 3.2 Python?
Multiple object detection using HOG+SVM?
How to use a dpm cascade model xml file in a Python script?
Is there any limit on maximum number of faces detected using DNN face detector?
Minimal area rectangle for multiple contours
LBPH parameters explanation
How to recognized face which are already detected by application?
Configuration config.xml file FacemarkKazemi Training
Fingerprint Database
How to find out if rect is inside another rect ?
HOG detection clarification
Motion detection. Undefined symbols for architecture arm64.
C++ read rgb+depth images sequentially
Traffic Sign Recognition Concept
how to compile 3.2 and merge all output library files into one ?
Has createBackgroundSubtractorMOG been removed?
2D spline algorithm in OpenCV
how to new Mat
Efficient calculation with multiple cv::Mat
Send/Receive vector <Mat> over Socket C/C++
Train images with SVM
strange result of transformation of frame of VideoCapture
How to use Mat::forEach position parameter?
Is it possible to combine 3 photos of different focal lengths to make the clearest image possible?
Wait for a mouse click?
A simple question on cvtColor
Specify background color when rotating an image using OpenCV in Python
cv::Mat to PCL point cloud, to data ptr?
wrong predictions from OpenCV Sample Digits.py
How to detect the "external" pixels in an edge?
Imread returns a blank image for a certain file
Identifying and selecting floor in a room
OpenCV (android) : How to get image metadata
Is DNN supports threading
MultiTracker Rois
error in cmake while configuring opencv extra modules path
Dnn forward result has rows = -1, colums = -1
How to move image inside a video
How to read gif in python ?
Normalize image 0 - 255 for display
i want to know how to implement blendlinear() function
Selection depth area
Code from the tutorial doesn't work
How to calculate the head and body angle with respect to the camera?
cv2.imread fail to open gif image
How to use cv::flann (radiusSearch) to find all neighbouring points within radius r in 2D using Euclidean distance
videwriter not working after image resize
exception in CountNonZero (too see if 2 mat are equal)
open cv 3.0, findContours return "too many value to unpack"
Segmentation fault with ORB feature extractor
Get pixel value of sobel Mat with C++
Negative values in filter2D convolution
How to convert a CV_32SC1 to int
How to combine multiple cv::RotatedRect objects?
How to generate checkerboard for camera calibration?
Kmeans support needed
Can I use opencv without GUI?
Removing selected rows from a Mat ?
Read from folder
[Solved] Simple application crash without errors
Matching colors between two pictures in OpenCV?
SimpleBlobDetector crashes silently
file loaded from std::ifstream to opencv image
How to access pixels along a line or curve using opencv?
Make a collage with other images
how to get the pixel value by clicking on image?
Does OpenCV forum have a Chat page?
Simple Way to Scale Channels
●
Organizer
×
1
opencv 2.4.3 and tesseract libstdc++
●
Scholar
×
1
can't create BackgroundSubtractorMOG in java/android
●
Good Question
×
2
Color constancy in different illumination condition
moderation
Copyright
OpenCV foundation
, 2012-2018. Content on this site is licensed under a
Creative Commons Attribution Share Alike 3.0
license.
Powered by Askbot version 0.10.2
Please note: OpenCV answers requires javascript to work properly, please enable javascript in your browser,
here is how