Can i get 2d world coordinates from a single image ([u,v] coords)?
I'm new to everything vision! I've read some similar posts but I can't get my head around it. Here's what I'm trying to do: -I have a single camera looking down on a surface (we can assume it's normal...
View Articlewhy TickMeter class only used in the gpu samples
double t = (double)getTickCount(); // code you want to measure the performance t = ((double)getTickCount() - t)/getTickFrequency(); cout << "times passed in seconds: " << t << endl;...
View Articleopencv3 EM.getCovs(covs)
what type should `covs` be in `getCovs(covs)`? From the 3.0-beta c++, "Returns vector `std::vector& covs` of covariation matrices. Number of matrices is the number of gaussian mixtures, each matrix...
View ArticleOpenCV Blob Detection (python) (irregular circles) !
Hi, i'm working in an image processing task with OpenCV (pyhton). I'm processing a video to detect/track some LEDs information (position, color, etc,...) Here is a sample of a original frame,...
View ArticleHow to keep tracking one object forever?
Hey. I am trying to track ants, it is really hard because ants change its form and I am using grayscale image. It means, mosse and camshit didnt work on my project. I have to track 1 special one(not a...
View ArticleIssue Masking Input Image to findContours
Hi, I am currently implementing obstacle detection using the camera output of a robot's floor-directed video camera. Using canny edge detection as preprocessing I am able to efficiently find contours...
View ArticlePotential bug in Shape Context
File: https://github.com/Itseez/opencv/blob/master/modules/shape/src/sc_dis.cpp Line: 235 In function computeDistance(InputArray contour1, InputArray contour2) the following line seems to be a...
View ArticleBest Face and eye detection algorithms for opencv
i'm working on face and eye detection (no recognition needed) using opencv , and i've found some algorithms that i can use : 1. Viola–Jones object detection framework : This algorithm is implemented...
View ArticleHow can I add opencv libraries to setup.py?
I have created an embedded Python code where a C++ function is called from Python. I have created the setup.py as following. from distutils.core import setup,Extension...
View ArticleIs there any reason not to use UMat?
I'm currently writing a piece of software that uses various different modules of OpenCV (some examples are edge detection via Canny, filtering operators, optical flow and I have some own algorithms...
View ArticleOpenCL in OpenCV 3.0.0
I'm attempting to use OpenCV 3.0.0 (yes, I know it's a development version) to work with OpenCL. I'm using the UMat structure instead of the ocl::oclMat structure found in earlier versions. As...
View Articlewhen i use pre-built opencv i can use all full advanced technology in it??
hi to my dear friend,in docs opencv write that Note To use the OpenCV library you have two options: Installation by Using the Pre-built Libraries or Installation by Making Your Own Libraries from the...
View Articlecalling findcontours throws an exception...
Hi, I'm new to opencv, trying my hand at image tracking using OpenCV 3.0 and Visual Studio version 12.0.31101.00 Update 4 (2013). I am using code from this tutorial: https://youtu.be/X6rPdRZzgjg (I'd...
View ArticleUndistor algorithm on OpenCV
Hello, I would like to get more information about undistor algorithm used on OpenCV. Here is the source of the program: https://github.com/Itseez/opencv/blob/master/modules/imgproc/src/undistort.cpp...
View ArticleHow to measure the distance from CAMERA and the object
Hi all, i need to measure the distance between the pi camera module and the object , i've found this formula distance to object (mm) = focal length (mm) * real height of the object (mm) * image height...
View ArticleHow do I do connected components in opencv?
I want to implement a simple connected component algo in opencv. If i know a point, how do I grow the region and get the foreground?
View ArticleDenoising algorithm which takes amount of noise variance present in image and...
Hi, How to denoise an image with specific noise variance(estimated already)? I want to pass the estimated noise variance to function to remove the noise in the image. Can anyone direct me to good...
View Articleedgeboxes algorithm, api advice?
Hi all, I'd like to implement the edge-boxes algorithm for objectness (http://research.microsoft.com/pubs/220569/ZitnickDollarECCV14edgeBoxes.pdf), and I'm looking for some input on the api. I have a...
View ArticleHow to design GUI in OpenCV Console Application
I developed video based face recognition in video using OpenCV by Console Application using C++ but now i am not able to design the GUI. Please anyone suggest me how to design the gui using OpenCV
View ArticleHow to find if 2 rectangles are overlapping each other
Hello Forum, For the following image below, how do i determine if the smaller rectangle is overlapped / partially overlapped with the larger one ? I have their coordinates in frame i.e. rect.x and...
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