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Questions tagged [opencv3.0]

OpenCV (Open Source Computer Vision) is a library for real time computer vision. (This tag is for questions about OpenCV 3.0. Use [opencv] for general questions.)

OpenCV is an open source computer vision library

Version 3.0 released in June 2015. Its documentation can be found here.

For more information, see .

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import cv2 work on IDLE but error on command prompt

The issue is exactly opposite of this issue. I have installed OpenCV as mentioned in its documentation on windows 10. (Copying a file into python lib directory). When I import cv2 from the python IDLE, its working fine but when I use command prompt…
Thilinã Nűwań Mălsăra
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automatically getting edge detection for image alignment

I am trying to do image alignment like posted on adrian blog like this image or in this link. I want to do image alignment on this kind of image. The problem is I want to automatically detect the 4 point edges which are hard to detect in this kind…
fajara kurniawan
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How to find Opecv function's original code

Hi I would like to read the code of the function StereoSGBM, how can i find it inside the opencv library? There is a short command to find it from the python prompt?
gaetano ma
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Play H.264 camera streams using OpenCV

How to play H.264 camera streams using OpenCV? I was searching for a while but i didn't find an answer. I think OpenCV can encode and decode h.264 videos since it uses ffmpeg and it is the documentation of the class VideoWriter ensures that as shown…
peter bence
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getting multiple v4l errors using opencv with multiple webcams on a raspberry to shoot a timelapse

I'm posting this because i was already searching the web trying to find some explenation for the errors caused but didn't find any. So I'm trying to shoot a timelapse of a growing plant from 4 different angles. I have 4 webcams (Logitech B525)…
eALduderino
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How do I install OpenCV without it upgrading my python version on Mac?

I tried to install opencv for Python 3.6.5 on Mac OS. I tried brew install opencv, but it updates my python version to 3.7. I tried brew pin python and then tried the installation but it just fails as it can't update the dependency. Error: You must…
Anirudh Chakravarthy
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AttributeError: module 'cv2' has no attribute 'CV_FLOODFILL_FIXED_RANGE'

I am currently building an Automatic licence plate recongition system. I am referring to this page http://nbviewer.jupyter.org/gist/kislayabhi/89b985e5b78a6f56029a In this code, two paramters namely "CV_FLOODFILL_FIXED_RANGE and…
Srikanth
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What is the correct way to Normalize corresponding points before estimation of Fundamental matrix in OpenCV C++?

I am trying to manually implement a fundamental matrix estimation function for corresponding points (based on similarities between two images). The corresponding points are obtained after performing ORB feature detection, extraction, matching and…
Arun Kumar
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How to fill the entire region of any image after or before performing canny edge?

Sample Input image Sample partial output image I want to fill all the white regions inside the card.
sohail
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Trouble trying to install OpenCv 3 in ubuntu 16.04

I am stuck trying to install and to compile OpenCV. When I try to install something with pip, for example $ sudo pip3 install virtualenv virtualenvwrapper I always get the following error : The directory '/home/..../.cache/pip' or its parent…
Soichiru
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video thumbnails on remote server with openCV

I have a flask app. When i run it on my pc it can take videofile, create non-black thumbnail, using flowing code: uploaded_files = request.files.getlist("file[]") for i in uploaded_files: ...... vcap = cv2.VideoCapture(file_path) b =…
Gintoki Sakata
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The netwrok name cannot be found

I'm trying to run my application from source on another computer using eclipse, where at start it loads the Opencv library dll through System.loadLibrary(Core.NATIVE_LIBRARY_NAME). On the first machine it was working fine, however here it…
Noux
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Picking range of HSV from video - huge variation on sample

I've created the program that picks up the pixel from the video and convert it from RGB to HSV. Then using range function it filter that colour on the video. The problem is: When I look at the video, the sample I'm picking the pixel from looks flat…
Filip Matyja
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Near edge keypoint feature extraction

I am writing a keypoint description procedure using opencv and python.The following picture represent a window that covers a keypoint. The features are aggregated from the pixels that this window covers. The issue I am having is with pixels that…
Lilo
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Confused by OpenCV image representation

I'm loading image into cv::Mat. For some reason, when I'm printing each pixel data, color doesn't match with actual image pixels. Clearly, there is no (28, 36, 255), (127, 127, 255) colors on the image. Could someone point to my mistake? Here are…
Peter
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