How can I find the regions in an image that have exactly the same color?
Given a 3-channel color image what is the easiest the way to find connected components such that pixel A is considered connected to pixel B if A and B are adjacent and exactly the same color?
View ArticleRTSP stream using VideoCapture, transition from 2.4.11 to 3.1
Hello everyone, I am a little bit lost and would like to hear your advice on my problem: (Platform ist win32, x86 + x64) We are trying to upgrade from OpenCV 2.4.11 to OpenCV 3.1 . So far, it all...
View ArticleUnderstanding the camera matrix
Hello all, I used a chessboard calibration procedure to obtain a camera matrix using OpenCV and python based on this tutorial:...
View ArticleDetectors for FREAK and BRISK for scale and rotation invariance
I want to use either FREAK or BRISK descriptors that should be scale and rotation invariant. I am quite confused about the following points 1. Do FREAK and BRISK need scale and rotation estimation...
View ArticleBuild shared for Android libc++ fails
I'm did a clone from https://github.com/Itseez/opencv.git @ commit 6e5e5d87df4212b91839704ff153ec6d8f2549f6 I used this cmake command: cmake \ -DBUILD_SHARED_LIBS=YES \ -DANDROID_ABI=arm64-v8a \...
View Articlevoluminosity of a substance which is infront of two cameras
Hi I want to calculate the voluminosity of a substance which is infront of two cameras. And my question is this, do we have any program in sampling of opencv? I would be grateful if you send me the...
View ArticlePython. K-nearest neighbour TypeError: samples data type = 17 is not supported
I'm trying to classify some images using SIFT for detect and compute keypoints and descriptors, and then use KNN for classify them into python interpreter: ## Detect keypoints and compute descriptors...
View Articlestitcher::stitch black output
I'm trying to use stitcher::stitch to stitch two images. I have tested my code with many images, but each time the output image is just a black image. The code that I have put together is: #include...
View ArticleHow to get Q and R in QR decomposition ?
Hi there, I have to use QR decomposition to get q and r matrix.I find that solve() function can solve QR decomposition problem. However, I cannot get the q and r matrix in this function as getting...
View ArticleHelp analyze 'make' error in opencv-contrib3
OS X 10.9.5 Mavericks python 2.7.11 homebrew installation opencv 3.1.0, opencv contrib3 cmake 2.5.2 build with cmake -D CMAKE_BUILD_TYPE=RELEASE -D BUILD_OPENCV_PYTHON2=ON \ -D WITH_FFMPEG=OFF -D...
View ArticleBest method/features for distinguishing between similar objects that are...
Hi, I am trying to classify (distinguish) between several different swimming fish who are very small, look very similar, and are very similar in size. Please note, I have already segmented the objects...
View ArticleError when using cv::StereoBM
Hello , I am new to opencv . I am trying to create a disparity map as found in this tutorial : http://stackoverflow.com/questions/31008859/stereo-with-opencv but i come up with following error :...
View ArticleWhat is the difference between machine vision and Computer Vision?
I searched the web to find the difference between two, but i cant get a clear cut Idea about it. Is the following statement is the only difference? " The Computer vision is the ability of a computer...
View ArticleSegmentation fault when copying Mat to struct
I am trying to fill a struct with Mat objects to pass to a thread. struct thread_data{ int thread_id; int socket; uchar* receiveBuffer; // MAT IMAGE HEADERS: Mat _leftImage; Mat _rightImage; Mat...
View ArticleHow to Extract track information with OpenCV?
  Hi,I just need your help. We're preparing for Robocon 2016. according to the rules,our...
View Articlewrite pixel to mat
I want to manually set every pixel's R,G, and B floating point values to 0.4. When I run the following code I get an error. What am I doing wrong? The error at run-time is: > *** Error in...
View Articletraincascade decrease training time when training deeper stages by...
Hello friends,i am currently working on the subject specified in the topic since it is one of the most common problems of the traincascade tool,what is the correct way to go through with this?My main...
View ArticleFeature matching to check similarity between two scenes
Hello guys, I am working on a project and I have to make an AR drone follow a path based on a list of checkpoints which are saved in a directory. Each checkpoint is a scene that the drone should detect...
View ArticleSet parameters of BRISK detector with common interface
I would like to use the BRISK detector with the [common interface](http://docs.opencv.org/2.4/modules/features2d/doc/common_interfaces_of_feature_detectors.html#featuredetector-create). Hence I create...
View ArticleHow to use BRISK in OpenCV?
Hi! I can`t find any information of how to use BRISK key points detector and extractor in OpenCV on C/C++. If anybody knows, please, write the code or give a reference. Thanks!
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