Unable to calibrate fisheye image from Python
Hi Guys, I am trying to calibrate a fisheye camera using the cv2.fisheye.calibration function, but I am unable to succeed. I have succeded using the regular cv2.calibrateCamera() function in the past...
View ArticleWrong definition of Chi ² distance?
Could it be that the formula for computing the chi² distance between histograms as pointed out [here](http://docs.opencv.org/modules/imgproc/doc/histograms.html?highlight=comparehist#comparehist) is...
View ArticleProblems with the video writer in OpenCV-3.0.0
Hi, I asked this question last week about the video writer in OpenCV-3.0.0 with Python 2.7 not working properly, but didn't get any answers. I am surprised nobody else is facing similar problems. I am...
View Articleopencv_traincascade: what resizing is done by opencv?
I am training a cascade to detect objects. Some of the samples I have do not have the same width to height ratio as the window I am planning use for training/detection. I assume that opencv does some...
View Articlecv2.VideoCapture: Cannot read from file
Hi! I try to process videos using the Python interface. I downloaded OpenCV 2.4.2 and copied the cv2.py file to the Python27\Lib\site-packages folder on Windows 7. Using the following code, I'm not...
View ArticleEstimate pose of moving camera relative to a stationary camera, both looking...
Assume I have two independent cameras looking at the same scene (there are features that are visible from both) and that I know the calibration parameters of both the cameras individually (I can also...
View ArticleQT5.5+Opencv3.0.0 Undefined symbols for architecture x86_64S
I tried to use SURF detector and descriptor in opencv3.0.0. However, the error is Undefined symbols for architecture x86_64: "cv::xfeatures2d::SURF::create(double, int, int, bool, bool)", referenced...
View ArticleDoes EM training use multicore (when built with TBB)?
Does Expectation-Maximization training use multiple CPU cores (and - if yes - does it give a significant speed up)? Or only predicting does? I'm asking both about new OpenCV 3 and older versions. Thank...
View Articlefeature matching + findHomography + perspectiveTransform issue
Hi, I've been playing with around with OpenCV, and have been trying to implement a simple logo detector. I started with the feature homography...
View ArticleAwful disparity map using StereoBM
Hello. I am trying to make cloud point from pair of images. I am using StereoBM to create disparity map, but results is very, very bad.  [My code on...
View ArticleOpenCV in C++ Builder (RAD Studio XE7)
Hi all, Would you kindly give some information on if it is possible to use OpenCV with Embarcadero RAD Studio XE7 C++ Builder or not, I will be pleased. Sincerely yours,
View Articlevideo is not opening in opencv 2.4.10 with python
import cv2 cap = cv2.VideoCapture('m.avi') print cap.grab() this code always returns a False value but when opening the video file which was captured by the webcam using opencv code, it returns True
View ArticleHow to build the Java wrapper for OpenCV 3.0?
I am using OpenCV 3.0 in my Java application through the `opencv-300.jar` and `opencv_java300.dll`. They come with the standard installation. But some extra modules are not in the standard...
View ArticleCan I use stream as Video input
I would like to use Sony video camera as video input for my opencv project. It can stream video to ustream, but can I get that footage live from stream and get it into opencv?
View ArticleUnable to use cvCreateButton function.
Hi, I am writing sample opencv button program in c using Opencv 2.4.10. But I am facing compilation error (ie. .text+0x13d3): undefined reference to `cvCreateButton'). Please let me know how to...
View ArticleopenCV4Android v.3.0.0 hand sign recognition in Java
I would like to write an application on Android, which recognise a sign, in my case alphabet. I have done detection a hand (background substraction), with find biggest contours, convex hull and...
View ArticleBest approach to integrate MXPEG to OpenCV?
Hello, I just got a Mobotix camera and this camera offers next to a normal MJPEG stream also streams in MXPEG. To me it looks like the MXPEG codec brings advantages for me in comparison to MJPEG....
View ArticleI'm very disappointed about opencv 3.
Unable to compile it on Windows using MinGW and contrib modules. Unable to link it on Mac OSX. It's working only on Linux. A year ago more less I have uploaded a little patch for Linux (many hours to...
View ArticleImprove training cascade speed
Hello. I compilied Open CV with TBB (at wiki some errors about using sources of TBB (you must use binary files and import folder, also add path of TBB to windows path)). I think that I could use all...
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