SVM & Gist Descriptors
I have images. I want to train them. For that i need feature descriptors, using LEAR GIST from this website: https://lear.inrialpes.fr/software and using LibLinear or LibSVM from here:...
View Articlecant play the saved video
I have tried many codecs , all but the last one produce 0 bytes video, the last codec does produce a video file with some but then its not playable . This problem is driving me crazy , The code I am...
View Articlebest way to do the traincascade via the standalone tool
Hi all I'm trying to train a classifier to detect cars shadows (rear view) and I am facing difficulties doing that. I don't know exactly what is needed to do so as I'm using around 280 positive...
View ArticleVideoCapture result in distorted lines in image
I am trying to click an image from Webcam using OpenCV. My code is as follows. VideoCapture cap0(0); cap0.set(CV_CAP_PROP_FRAME_WIDTH,320); cap0.set(CV_CAP_PROP_FRAME_HEIGHT,240); cap0 >> frame;...
View ArticleOpencv color ranges for hsv
What are the hsv ranges for the colors black,blue,red,green,orange,grey,yellow,purple,brown and white. I need to check if my hsv image is in this range and print the color. How do I find the ranges of...
View Article3D Rotation - warpPerspective
Hello guys, I need your help. It is possible to rotate this image with the rotation matrix from the calibration? I would like to align the image for the further processing If I use warpPerspective and...
View Articlesimple question:starting with open cv
Hi, I am testing open cv with this simple code: #include // A Simple Camera Capture Framework int main() { CvCapture* capture = cvCaptureFromCAM( CV_CAP_ANY ); if ( !capture ) { fprintf( stderr,...
View Articlecustom codec
I use LG's IP AVI Smart Station Codec package for videos I have, but Opencv (VideoCapture) does not open this video files. What should I do? LG codecs folder contents ffh264.dll, ffmjpeg.dll, g7xx.dll
View ArticleHow to use opencv dft with Neon support from Qt on Raspberry Pi 3
Hi All. The problem is that my cv::dft function is running extremely slow on the raspberry pi 3, comparing when ran on a regular PC. I have a raspberry Pi 3 ( jessie ), with opencv 3.1.0 and Qt...
View ArticleRTSP communication problem
Hi, It is my first question in this forum, after looking for a long time any solution. I'm using python 2.7 with OPENCV '2.4.13' (I already tried with 3.1) and I can't open streams. I already solved...
View ArticleHiring OpenCV Developers [Robotics AI Startup]
**What is Tend.ai?** We’re a cloud robotics software company, backed by True Ventures. We allow robots to understand machines like a human. Watch our video at Tend.ai **Recent Press** -...
View ArticleOpenCV loading failed on Huawei BTV-W09
Hallo, I am working with OpenCV4android version 2.4.11, the way i load openCV library as shown below in the code works fine on Samsung device, but when I tried the same code on Huawei MediaPad with...
View ArticleHi.. i'm new to opencv and trying shape detection. I have faced the following...
My program, int main() { //cv::Mat src = cv::imread("polygon.png"); cv::Mat src; cv::Mat gray; cv::Mat bw; cv::Mat dst; std::vector approx; std::vector> contours; VideoCapture capture(0); int q;...
View ArticleTesseract finds letters where none are
Hello guys, I need your help :) I use tesseract for text recognize. Therefor I grab al lot of ROI´s in my Image. Of course some ROI´s are garbage or contain a symbol (see the pictures). But tesseract...
View ArticleKalman Filter - Assertion failed - Matrix types
Hey, I try to build a kalman filter and get runtime errors at the step `Mat prediction = KF.predict(control);` in regards to the matrix types. I checked all the types of the input matrices and they...
View ArticleOpenCV Environment variable changed
I had my standalone installation of OpenCV on my Linux machine and it was running OK. I installed ROS (comes with its OpenCV) and today I cannot run my CMakeLists.txt in any of my OpenCV projects,...
View ArticleAccess violation reading location - when I am trying to do a clone(). The...
When I am trying to make a clone on a matrix an exception is thrown randomly for clone and for flip too. These exceptions are from opencv_world300.dll.![image...
View ArticleUsing the opencv_contrib dnn module (too slow)
I am using a caffemodel (trained for gender classification) with the dnn module of the opencv_contrib library. The issue I am having is that it is running pretty well but it is extremly slow, it takes...
View ArticlecvFindContours is faster than cv::findcontours
Hi, I'm using 2.4.8 opencv in a VS application and I have just updated source code changing old C functions with new C++ functions. In particular I have verified that cv::findcontours is slower than...
View ArticleHow to crop digits automatically in sequence for recognition?
I am trying to implement Automatic Digit Recognition. For this I am using C++ with OpenCv. I have successfully trained SVM classifier ,successfully can able to crop the digits from the group of...
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