Questions tagged [opencv]
OpenCV (Open Source Computer Vision) is a library for real time computer vision. When using this tag, please add a language specific tag (python, c++, ...), if relevant.
opencv
29,489
questions with no upvoted or accepted answers
21
votes
0
answers
808
views
Using Android Studio's C++ support to build nonfree OpenCV modules
Background
Although, older versions of OpenCV (ie 2.4) allow Android projects to utilize `SIFT` functionality, the separation of that functionality into `opencv_contrib` makes the task more difficult;...
- 5,743
17
votes
1
answer
2k
views
Android unit test for camera preview?
i try to unit test my camera preview image, is it possible to set a static image as "camera image" during testing or should i try implementing my own mock object?
I'm looking for something like:
...
- 284
17
votes
1
answer
2k
views
unable to implement descriptors in android
I am creating an application for finding matches between two images. I am not able to properly find match results.
Matching methods give me the same number of descriptors as the input keypoints and ...
- 171
15
votes
6
answers
6k
views
Unable to get double click event in OpenCV for python
OpenCV with python(MAC OS X EL Capitan)
I'm creating a demo project to track mouse events in openCV. using standard mouseCallback from openCV.
following is my code for the same.
drawWithMouse.py
#!/...
13
votes
1
answer
2k
views
using address sanitizer with OpenCV
I'm trying to use Google's Address Sanitizer with a CUDA project, more precisely with OpenCV cuda functions. However I got an 'out of memory' error on the first cuda call.
OpenCV Error: Gpu API call (...
- 891
13
votes
3
answers
7k
views
Append a frame to an existing video (.avi) file using OpenCV
Is it possible to add (append) new frames to an existing .avi video file using OpenCV, without overwriting the whole file?
I am using OpenCV 2.4.2 on Windows 7, with Qt.
- 188
12
votes
1
answer
10k
views
Digital Numbers on Tesseract OCR
SOLUTION:
I've had to train my own data to try it with the OCR. It seems that works well, but I don't know why the trained data from arturaugusto not works for me =(
https://github.com/adri1992/...
- 937
11
votes
1
answer
11k
views
How to integrate OpenCV.js in a React WebApp?
I'm new to Javascript and React. I would like to embed OpenCV.js into a basic React.js web app to build an online client-side document scanner (I already have the image processing pipeline developped ...
- 375
11
votes
0
answers
3k
views
Use OpenCV, cv2.videocapture in Kivy with Android - Python For Android
I have been working for a few days, trying to use cv2.VideoCapture() in python-for-android. I'm using Kivy with buildozer to build apk for Android. Here is my code
from kivy.app import App
...
11
votes
1
answer
401
views
How can I add a stable marker (solid circle on image)? Which will be at the same position on the next frame of the camera?
I am thinking to add markers on images taken from camera output similar to what the Google PhotoScan application does. As I can see the Google PhotoScan app adds four solid circle on an image which is ...
- 121
11
votes
0
answers
2k
views
Can I remove opencv directory after installation?
I have installed opencv successfully. I guess the library has been put to /usr/loca/lib after installation. The problem is I do not have much space on my disk. So can I remove opencv directory ...
- 131
11
votes
0
answers
2k
views
ZCA Whitening with opencv and java
I'm trying to implement ZCA Whitening algorithm like shown here: How to implement ZCA Whitening? Python with opencv in Scala (using Java api) but I cannot find the most of the functions used there (...
- 1,113
11
votes
1
answer
1k
views
Voronoi graph from set of polygons in Emgu CV (or OpenCV)
Using Emgu CV I have extracted a set of closed polygons from the contours in an image of a road network. The polygons represent road outlines. The result is shown below, plotted over an OpenStreetMaps ...
- 1,759
11
votes
1
answer
8k
views
OpenCV Stereo Matching/Calibration
I'd initially posted this on the OpenCV forums, but unfortunately, I didn't get too many views/replies so I'm posting here with the hopes that someone might have a direction to please suggest?
I am ...
- 111
11
votes
1
answer
2k
views
Does MATLAB use OpenCv CascadeClassifier?
I have a question about CascadeObjectDetector in MATLAB. In source code of CascadeObjectDetector in MATLAB I see:
pCascadeClassifier; % OpenCV pCascadeClassifier
Then I see:
%----------------------...
- 896