Fitting a point-cloud
Hi, I'm looking for a solution to fit a captured 2D-pointcloud into a given pattern of 2D-points. As result I expect the X/Y-translation and the rotation-angle. In our System we can use python 2.7 and...
View ArticleCamera Calibration
Hello Forum I am trying to determine the camera matrix so that I can extract the position of the camera in world coordinates. I have an image (below) and have all the points in world (meters) and pixel...
View ArticleCreate mask to select the black area
I have a black area around my image and i want to create a mask using OpenCv C++ that select just this black area so that i can paint it later. how Can i do that with out affect the image it self. I...
View Articleellipse approximation of blob using contours moments : confusing orientation...
Dear all, I want to draw the ellipse approximating an isolated blob (the largest contour found with findContours). Using the formulas of paper :http://goo.gl/yvcUO5 for the major and minor axes I...
View ArticleDisplay webcam input in window
I'd done build a window to display input image using multithreading. But now I'm stuck, how can I display image in this window (as in figure attached here) since I'm using OpenCV. ![image...
View ArticleSome doubt with the eigenvalues size of PCA
Assuming the mat is 246*3000,that is, I have 246 data and 3000 feature. Then I use the PCA as below and the result is 246. I think it should be 3000, what wrong with the code？ PCA pca(mat, Mat(),...
View ArticleANNMLP did not have a load method for loading trained XML(Android binding)
I used ANNMLP in opencv c++ binding for a classification problem.I trained a network and saved it in XML file .I am able to predict the classification for newer samples by loading the trained XML...
View Articlexphoto::inpaint Vector out of range
Hi, I am trying to use the xphoto::inpaint function implemented in opencv3.0 using VS 2013. however I am getting a vector error "Expression: vector iterator + offset out of range". I have tried the...
View ArticleVideoCapture won't open camera on osx
I have a MacBook with a built in camera. When I try to open device 0 with VideoCapture, **`isOpen()` always returns false.** My OpenCV lib is compiled from source. Build options are largely default,...
View ArticleStitching module with SIFT and DAISY algorithm
Hi, I tried to use SIFT and DAISY in Stitching module in Opencv 3.0. Below is the detailed code changes I have done. In sources\modules\stitcing\src\matchers.cpp, following codes were added...
View ArticleWhether the file opencv2/text.hpp has been exist?
I was begin to study OCR thr A demo program of the Extremal Region Filter algorithm described in * Neumann L., Matas J.: Real-Time Scene Text Localization and Recognition, CVPR 2012. But I found no...
View ArticleHow to access pixel by pixel value of Iplimage object in javacv
please anybody tell me How to access pixel by pixel value of Iplimage object in javacv. its very urgent
View ArticleRTrees regression to multiple output responses
I am using RTrees for regression. However, I don't find the way to make it work with multiple variables. I am using code similar to the tree_engine.cpp sample. My features have dimension 300, and I...
View ArticleHow to change transparency of an 4 channels image?
Give a alpha degree and set image transparency. I didn't find the API to do this.
View ArticleFiltering SIFT points by y-coordinate with OpenCV + Python
I have the SIFT keypoints of two images (calculated with Python + OpenCV 3). I want to filter them by their y-coordinate. Specifically, I want to remove all matching points whose difference of...
View ArticleOpenCV Error: Incorrect size of input array (Non-positive width or height) in...
I am working on Road Sign Detector project and i met with this issues in matching the category of images. Please give me solution.I will appreciate your time.
View ArticleInformative websites related to OpenCV
i think it will be useful if we add links of informative websites related to OpenCV here. Lets create a list together. **recently added to list:** http://rodrigob.github.io/...
View Articlebackground subtraction from panoramic picture
I am trying to develop a surveillance system in the raspberry pi. The aim of my project is to track persons, or moving objects with two servo motors. As the HOG detector does not detect people when...
View Articlecannot run opencv in java
i follow step by step at website "http://docs.opencv.org/2.4/doc/tutorials/introduction/java_eclipse/java_eclipse.html" to build first opencv project in eclipse . But it does not work. Here is my...
View ArticleUnsatisfiedLinkError
I follow completely proccess in http://docs.opencv.org/2.4/doc/tutorials/introduction/java_eclipse/java_eclipse.html Here is my code : package game2; import org.opencv.core.Core; import...
View Article