OpenCV Error: Gpu API call (CUDA_ERROR_NO_DEVICE [Code = 100])
Hey everybody, I successfully compiled the (opencv-3.1.0/samples/gpu/) video_reader.cpp sample with nvcc. The sample **works just fine with any video** I've tested except a MJPEG file. I also tried...
View ArticleIdentifying black cars with OpenCV in Python
Hello, I'm using OpenCV in Python to identify cars in a parking lot. It works fine when the color of the car is different than black. Here is my code. It basically applies a canny and counts the white...
View ArticleHow to identify black screen, jitter,skew in live stream using OpenCV
Hi, Need your help on below queries. 1. How to identify black screen, jitter,skew in live stream using OpenCV.? 2. if we have reference Image , how can we identify those parameters ? 3. Do we have any...
View ArticleHow to copy recognized image (only recognize image not full image)
private DaemonThread myThread = null; int count = 0; VideoCapture webSource = null; Mat frame = new Mat(); MatOfByte mem = new MatOfByte(); CascadeClassifier faceDetector = new...
View ArticleScene Text Recognition with OpenCV in JAVA
I need to perform scene text recognition with OpenCV as explained in its [official documentation][1]. However, because of some inevitable technical constraints I need to do it using the Java wrapper...
View ArticleCannot build OpenCV 3.1.0 from source with FFMPEG
I've been trying all week to build OpenCV 3.1.0 from sourcefor Python3.5 and Python2.7 on my local computer (Ubuntu 15.04 Vivid 64-bit), since there does not appear to be a compatible version...
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View ArticleExtract Feature Detection from OpenCV Facial Recognition Algorithm
Hello, I am aware that OpenCV has algorithms like Local Binary Patterns and Eigenfaces for facial detection as described here:...
View ArticleObject detection and navigation with Visual Camera?
Hi I have just ventured into computer vision and trying to demystify various intricacies of it. I am trying to detect object in outdoor environment with Visual Camera and navigate a mobile robot to the...
View ArticlematchTemplate c++ exception first time only
running video file with several thousand frames. matchTemplate crashes only on the first time i call it, then runs fine every time afterwards. first time called, Live and template are two different...
View ArticleWebcam does not capture video using openCV
my webcam does not capture the videos through openCv, python27. My code is working fine on other systems. so the problem must be in my laptop. i'm using windows 10. If there's anyway to solve this...
View ArticleStereo Camera: Where is the Origin of Epipolar Line?
In a standard Stereo camera set-up where is the Origin of Epipolar line? whether it is at the Lens or at Image sensor? I'm using Opencv [Stereo camera...
View ArticleHOG:How much to resize image when calculating HOG features?
I am trying to make a function in c++ using opencv(2.4.9) which will be similar to the extractHOGFeatures function of MATLAB. I need to know whether there is way to compute the HOG features without...
View ArticleHow can I threshold exactly my image ?
[C:\fakepath\2.PNG](/upfiles/14643338637289509.png) How can I threshold exactly my image. The attach picture return error result. Please help me.
View ArticleHow to ensure that extractor does not remove keypoints
I'm working with a framework that relies on keeping the number of keypoints constant before and after descriptor extraction. So far I applied a detection mask such that keypoints are not detected if...
View ArticleConversion NV21 (YUV420s) to RGB
I want to convert NV21 image to RGB image using IplImage (old c++ code source). IplImage *p_imageYUV420s = cvCreateImage(cvSize(height + height / 2, width), IPL_DEPTH_8U, 1);...
View ArticleHow can you find the coordinates of the points with a certain colour
Hello, I have this cannyed image:(http://) I would like to find the coordinates of the points in the frame of reference of the image that have the...
View ArticleHought Circle coin detection variation
I am working on getting coin diameter in pixels using OpenCV but I am not able to get perfect pixels diameter as it varies from 2- 6 pixels randomly by taking a image from same height. I am using...
View ArticleReproject image to a new camera position
I have a camera on a moving platform. Images are taken as the camera moves along its optical axis. Thus I have the scenario with two images taken at different times from the same platform going on the...
View ArticleAndroid Emulator Camera Displaying Blocks
I was working on the sample tutorials of OpenCV4Android. When I open the camera in my Emulator it's opening something wierd with White and black boxes. Because of this camera, I was unable to run the...
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