Calibration with findCirclesGrid - trouble with pattern width/height
Hi, I'm calibrating a GoPro Hero 4. I have calibrated using chessboard pattern. I would like to see if I can get a better calibration with the circles instead. However I'm having some problems...
View ArticleCan trackbar values be sent from another device?
I have made a traffic light detection algorithm with OpenCV and Python. My script has some trackbars which I need to adjust and see the output to set a desired stage. My script runs on my Raspberry...
View ArticleHow to change the input of the video capture card?
I have a video capture card which has 3 inputs (S-video,Composite,TV). How can I change the input of the capture card in run-time by using OpenCV? I am using Visual Studio 2010 c++ and OpenCV 2.1....
View ArticleHow to increase the thickness or darkness of edge after edge detection?
After using Laplacian operator for edge detection, i find that the edge is too thin, May i ask if there are ways to increase the thinkness or darkness in order to sharpen the edge detected? Image...
View Articlereturning a Mat from a function
Hi. I am new to OpenCV. I have the following code that outputs garbage (some random numbers). Can you please help me understand the problem? #include #include #include #include using namespace std;...
View ArticleCalc the Seconds moments of area of huge number of countours
Hello! Finally I was able to properly fit he mesh with the layer. For this [image (7158x16392 8MB) ](https://dl.dropboxusercontent.com/u/710615/testLayer6_.png) I need to calculate the percentage of...
View ArticleBlured corner detector for blured images
I have tested Shi-Tomasi corner detector (http://docs.opencv.org/2.4/doc/tutorials/features2d/trackingmotion/good_features_to_track/good_features_to_track.html) which is great to locate areas with text...
View ArticlePreprocess images before feature detection?
Hi! My goal is to find known logos in static image and videos. I want to achieve that by using feature detecton with KAZE or AKAZE and RanSac. I am aiming for a similar result to:...
View Articledetecting the plate in forklift
I'm using a kinect and having depth map and Ir image of a fork lift. I would like to detect the plate of the forklift. providing having the point cloud of the forklift and having the ir image. What...
View ArticleOpenCV make fails with CUDA support
Hi I'm trying to build OpenCV with CUDA support on ubuntu 15.10. CMake shows there is CUDA 7.5 available. And CMAKE is successful. When I run make command, I get the following output> --...
View ArticleHow do I obtain votes when predicting classes on a multi-class RTree classifer.
I have tried PREDICT_MAX_VOTE, PREDICT_AUTO, PREDICT_MASK but none of them seem to be of help.
View ArticleDetecting frequencies by 1D Fourier Transformation
What I want to do is to reconstruct frequencies out of a line of numbers. What I have is an array which I fill with values generated by f(x)= 4 * sin(0,5 * x) + 100 for test purposes. My goal is to...
View Articlecuda::hostmem thread safe?
I am running the following threaded code which is throwing only in the debug build. The source of the error is in the memory stack. Which is indicating that allocation and release size of memory don't...
View ArticleOpenCV 3.1 - Upper body detection not working in any example
My problem: no upper bodies are being detected when using haarcascade_profileface.xml or haarcascade_mcs_profileface.xml. Software used: - print cv2._ _version__ yields 3.0.0 although the x86 version...
View Articlecan't build on ubuntu
hi, i was installing opencv on my ubuntu 14.04, but when i tried to make, it just display "make: *** No targets specified and no makefile found. Stop." I couldnt generate the make file......pls help...
View ArticleUnable to understand connectedComponents() in opencv
I am writing a program wherein i need to use connectedCompponents(img, label, connectivity= 8, type= CV_32S ). All I know is that this function returns an integer stating the no of components in the...
View ArticleBook label detection
Hi experts, given a library setting and a picture of a bookshelf (e.g., something similar to this [picture](https://socalchurchlibraries.files.wordpress.com/2013/08/ecla-socal-2012-fall-13.jpg)), I...
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Herbal pills And Depression Treatment
Keep a journal! Record your feelings on paper - particularly the painful pride. Keeping a journal can an individual gain an insight into your heartaches. Sit down and write for 20 mins each day, don't...
View ArticleFace Detection Error OpenCV 3.1.0
I am trying to get started in opneCv and get learning but am running into problems in regards to face detection the code I have should detect faces I believe my linkages are fine can someone please...
View Articlealgorithms for image recognition, learning recognition
Hi, Do you or one of you know algorithms for image recognition, learning recognition ? I search experts in this field for our autonomous truck solution you can see us at www.vivifytrucks.com for more...
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