Detect circlues using Circular Hough transform does not work correct
I would like to detect circular objects using OpenCV and Circular Hough transform (HoughCircles). In the image I have 3 circles, but Im only able to detect one (or two of them) when set up the...
View ArticleHaar Training detectMultiScale does not work very well when size vary
Hello, I created my CascadeClassifier in order to find in some images if a parking sign is present. Sadly, it does not work very well. When I analyse the image from my webcam, taking a picture of a...
View ArticleIn svm classifier if I train it with 3 classes can it detect if the image is...
I would like to use svm for money denomitantion recognition and detection.
View ArticleI'm stuck badly in the code given below....i need to apply guassain filter in...
import cv2 def inside(r, q): rx, ry, rw, rh = r qx, qy, qw, qh = q return rx > qx and ry > qy and rx + rw < qx + qw and ry + rh < qy + qh def draw_detections(img, rects, thickness = 1):...
View ArticleAbout Fast algorithm
Why can't I use the functions getInt, or setBool? I used this code and these functions didn't work for me.  I get an error in OpenCV saying that...
View ArticleWould shot detection and ball tracking be easier with stereo camera versus...
Assume two camera configurations on a basketball court: 1) Solo: One smartphone on a tripod. 2) Stereo: Two smartphones on tripods, placed at same height and depth, 6-12 inches apart. The computer...
View ArticleHow to select the contour bounding a point (mouse event)
Hello everyone. I am working with OpenCV and I need to do the following : I have a contours vector, built with cv::findContours. I need to click the picture, select the first contour bounding the...
View ArticledetectMultiScale hangs on Mac / Xcode / OpenCV 3.1.0
I am trying to do some research with OpenCV and testing out some of the tutorial code for face detection I got through OpenCV website. I am new to OpenCV but I was able to install it ( not through...
View ArticleArguments of ShapeTransformer estimateTransformation method
Greetings, I'm a computer programmer who is working on a personal image processing project using opencv. The goal is to implement an image warp function which allows you to pick a point on an image and...
View ArticleJava tests for OpenCV 3.1 desktop
Are there any automated tests included in nightly builds for testing java wrappers? What is the process of contributing tests to OpenCV?
View ArticleHow to force opencv 3.0 to read BA81 image using libv4l2 ?
(/upfiles/14759252821837422.png)  v4l2-ctl --list-formats ioctl: VIDIOC_ENUM_FMT Index : 0 Type :...
View ArticleReading from RGB24 buffer is producing weird results
Hi, I am trying to get Unity3D to work with OpenCV. This looks good so far, but now I need to get some data from Unity3D to OpenCV. I created a RGB24 buffer from Unity and am reading it from OpenCV,...
View ArticleHow to stablize video in realtime?
I know openCV3.1.0 now has a video stabilization class, and I read and run the given example cpp code(.\sources\samples\cpp\videostab.cpp), I find it first run "estimating motion", and then process...
View ArticleGetting a fully blurred undistored image from cv::undistort
Hello, I am new to opencv and I am trying to undistort my camera's frames. I have used previously the callibration program from opencv to find the elements of the CameraMatrix and distCoeffs and I...
View ArticleIssue with calcOpticalFlowPyrLK()
Hello, I am trying to implement visual odometry via my webcam and the steps I have followed so far are the following: 1. Capture video from webcam (2 following frames each loop). 2. Undistort the...
View Articlesys/videoio.h: No such file or directory
Hi, when I try to install opencv and run this code cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D WITH_V4L=ON -D WITH_QT=ON -D WITH_OPENGL=ON .. So,I got an...
View ArticleVerification of fundamental matrix
I have evaluated the fundamental matrix using the following data: A = [[19, 53], [127, 145], [81, 208], [43, 173], [89, 37], [159, 64], [225, 136], [132, 192], [139, 79]] B = [[35, 40], [127, 104],...
View ArticleRunning Code on Android Studio From Github
I feel incredibly dumb asking this, but I've downloaded the code from https://github.com/betty1/FlagSpot I have version 2.1.3 of Android studio installed but don't know how to run codes on the...
View ArticleTBB affecting HoughCircles?
I recently installed OpenCV via cmake with the option WITH_TBB=ON on a raspberry pi 3. The code I wanted to accalerate is basically a circle detection with HoughCircles. Unfortunately the CPU usage is...
View ArticleProblems compiling Win32-project (while x64 works fine)
Hello, I built an opencv application with Visual Studio 2010 as an x64 application. Unfortunately I have to run the application now on a x86 machine. So I'm trying to change my application to win32. So...
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