OpenCV Q&A Forum - Latest question feed

Channel: OpenCV Q&A Forum - Latest question feed

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Build opencv 3.1 with Visual Studio 2008

April 14, 2016, 12:50 am

I'm trying to build Opencv 3.1 with Visual Studio 2008 but I get some errors as: - `stdint.h` not found - `__cpuidex` not defined - `data()` is not a member function of `std::vector` Is it possible...

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How to use CLAHE in android?

April 14, 2016, 5:58 am

ImageView img; Bitmap original, grayscale, histogram, resize, threshold; int fixedwidth = 480; int fixedheight = 800; Button btn_original, btn_grayscale, btn_histogram, btn_resize, btn_threshold; Mat...

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I get the error: segmentation error: (core dumped) when I try to run my C...

April 14, 2016, 6:19 am

I use the following code for reading and displaying the image, and to display the data in the image: #include #include #include int main() { IplImage* image = cvLoadImage("lena.jpg",0); IplImage*...

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solvePNP inconsistency when rotating markers on a plane

April 7, 2016, 9:51 am

I'm implementing a 3d laser scanner based on a rotating table with aruco markers on it for camera pose estimation. Here is a sample captured camera frame, with the aruco markers detected: ![image...

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imdecode() with any depth

April 14, 2016, 7:46 am

Hi all, OpenCV documentation specifies that I can invoke imdecode() with the same flags that we use in imread(). However, I am required to pass a Mat object to imdecode(), and this Mat object has a...

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HoughTransform optimization

April 14, 2016, 8:14 am

Hi, I am trying to optimize Probabilistic HoughTransform (HoughLinesP). I am currently using OpenCV 2.4.9. I need only to detect lines with certain angles so I want to limit the theta accumulator to...

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FaceRecognizer limitations?

April 14, 2016, 9:09 am

Hello, I would like to use FaceRecognizer to distinguish between specific faces. Accuracy is important to me and I'm making use of eigenfaces as I think it might be the best for this task(?). So far,...

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Are there any details or procedures which should be pay attention to for...

April 13, 2016, 8:52 pm

I was trying to do a haar training, the process and related parameters are shown below, and **the process seems to be in an infinite loop.** I did some research and found that maybe I should stop the...

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Blob Tagging with ID's in OpenCv Python

April 14, 2016, 10:02 am

0 down vote favorite I am currently making a python code for people headcounting with direction. I have used 'moments'method to gather the coordinates and eventually when it crosses a certain line...

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OpenCV4Android - calcCovarMatrix for image averages

April 13, 2016, 2:13 pm

So I have two RBG averages that I want to get a Mahalanobis distance for. The Mahalanobis function requires an inverse co-variance matrix. My question is how do I create a inverse co-variance matric...

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debugging opencv python eclipse

April 14, 2016, 10:50 am

I have installed cv2 via pip install cv2 for python2.7. I ran the example programs, for example capturing a video from the webcam etc. and it works fine. As far as I know, one needs the C++ libraries...

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full screen preview in javacv RecordActivity

April 14, 2016, 11:31 am

I use the RecordActivity sample how to set initialize full screen with correct ratio and best resolution in any device and camera? I tested any typical solution for android, but non of them gave me...

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cv::exeption ?????????

April 13, 2016, 2:09 pm

Hi please help me to solve this problem in open cv 3.1.0 i had implemented a gaborEnhancement filter and when i call this function it generate this exeption Unhandled exception at 0x00007FFF9B925BF8...

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svm->save() throws SEHException

April 14, 2016, 12:20 pm

I use the ff. code Mat data; Mat feature; hconcat(r_hist.reshape(1, 1), g_hist.reshape(1, 1), feature); //r_hist and g_hist are color histograms data.push_back(feature); int label = 1; Mat labelMat(1,...

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OpenCV 3.1 allocated 660meg while loading 5meg jpeg

April 14, 2016, 12:00 pm

Hello, Please help. I've got a docker image (Debian 8 64 bit inside) with OpenCV 3.1 and java application using it to load and manipulate images. While running docker on Windows (in Virtual Box) it...

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How to add more data to an already trained SVM?

April 14, 2016, 12:44 pm

I'm experimenting with the SVM shown as an example in the opencv docs.

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How can I compare an ideal projection with a real projection?

April 12, 2016, 12:41 pm

Hi, I'm trying to evaluate the accuracy of a projector. I mean, I want to compare an image with the ideal projection with an image with the real projection. What procedure should I follow using OpenCv?...

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How to train correctly a cascade

April 14, 2016, 11:54 am

Hi I've been triying of training a cascade in OpenCV to identify mouths using LBP. I cut the mouths of 10 images facial. The images look like as this: ![image...

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Is namedWindow implemented in the linux version ?

April 14, 2016, 8:49 am

The window.cpp code in highgui for namedWindow ends up calling CV_NO_GUI_ERROR("cvNamedWindow"). CV_NO_GUI_ERROR outputs "The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or...

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Training color histogram values to svm.

April 14, 2016, 3:17 am

Complete newbie here. I am trying to make a classifier using OpenCV 3.0.0's SVM and Color histogram to classify a banana to unripe(more green than yellow peel), ripe(more yellow than green or brown...

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