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Questions tagged [opencv3.1]

Use this tag only for questions that are specific to version 3.1 of OpenCV, for general questions use the [opencv] tag.

OpenCV is an open source computer vision library

Version 3.1 released in December 2015. Its documentation can be found here.

For more information, see .

340 questions
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Caffe+GPU+Opencv3.1+Python3.5+Anaconda:fatal error: Python.h: No such file or directory

Briefly I want to use Caffe these day for my project. My OS is Ubuntu 14.04, with Opencv3.1+Python3.5+Anaconda+GPU I have already passed all: make all make pycaffe make test make runtest However when can try to make pycaffe, it cannot…
Kaku
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Do I need to copy OpenCV native JNI libs to jniLibs directory if I'm using OpenCV manager?

I'm developing (with Android Studio) an Android app that uses OpenCV 3.1.0. I'm using async OpenCV initialization. My questions is: do I need to copy OpenCV native libs (OpenCV-android-sdk/sdk/native/libs) to my jniLibs directory…
David Miguel
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openh264 - bEnableFrameSkip=0, bitrate can't be controlled

there are a lot of questions asked regarding opencv + H.264 but none of them gave detailed explanation. i am using openh264(openh264-1.4.0-win32msvc.dll) along with opencv 3.1(custom build with cmake having ffmpeg enabled) in visual studio, i wanted…
Prakash M
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where is the staticlib for opencv 3.1

I just noted that openCV 3.1 is released, but when I download the binary files for windows, I noted that there is no static lib for this release. Is it a mistake or official that static libs will not be included into official binary release?
mans
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How can I draw a degree symbol (º) Special Character on image using `cv2.putText` (Android +OpenCV)?

I have to draw a text with a special character(100 degrees) over the image in Android by using the OpenCV library. Whenever I'll set text in putText function of OpenCV it's a show "100??". So please suggest if we have any third party lib or any…
Gurmeet Singh
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What is difference between (CountNonZero) and (Moment M00) and (ContourArea) in OpenCV?

If I have a 3x3 binary image and there is a contour in locations(x,y): (0,0), (0,1), (1,0), (1,1) I get the contour via findContours method. I want to get this contour's area: with CountNonZero: 4 with contourArea: 1 with Moment M00: 1 What is…
Salo7ty
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OpenCV iOS - Expected identifier (MACRO)

Getting error from "opencv2.framework". Just a new project contained "opencv2.framework" not running. My Steps: download latest opencv2.framework add required frameworks declare .pch file stuff changed .m file -> .mm Am I missing…
Ofir Malachi
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What is the best Head Cascade Classifier in OpenCV

I am using OpenCV 3.1 on a Raspbian Jessie OS using pi zero board. I used "haarcascade_frontalface_alt" for face detection and it works really good on low resolution images using Python. What i want to do is to detect the heads of people since i may…
Mostafa
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OpenCV Error: Unspecified Error(The Function is not implemented)

OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in…
Parth Chauhan
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Send image from OpenCV 3 to Cognitive Face API using C++ REST SDK

I want to use the Microsoft Face API from an application in C++. The cpprest sdk allows me to send an url of image or binary data of image. The problem is that my image is not a file in disk but a cv::Mat in memory. I have been trying to serialize…
Alejandro Sazo
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Running Executable Jar throws no opencv_java310 in java.library.path error but runs fine in IDE

I have made JavaFX Project with using Opencv 3.1 Java library in it. The thing is that my project runs completely perfect from the IDE but when I try to run the .jar file from the dist folder it throws the unsatisfied link error. I searched about…
Vishal Nair
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OpenCV Tone Curve progrommatically

I want to realize smth like tone curve. I have predefined set of curves that I should apply to the image. For instance: as I understand on this chart we see dependences of current tone value to new, for example: if we get first dot on the left -…
Siarhei
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What and why is "TypeError: Required argument 'layout' (pos 2) not found" error in Python??

Can I know why the error occurs and also i need help getting to run this project ?? When I type python mlp_training.py The ERROR I GET Loading training data... (0, 38400) (0, 4) Loading image duration: 0.000199834 Training MLP ... Traceback (most…
Carl Mccarry
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Error reading images using imread OpenCV

I am comparing two images using findHomography(). I have added extra modules from opencv_contrib in OpenCV 3.1.0 to use Surf and Sift algorithms and to compile for latest Android architectures. I can successfully compile the libraries using…
Shahzeb
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Makefile error causes undefined reference to symbol 'GOMP_parallel@@GOMP_4.0'

Warning: Newbie Ubuntu/g++/makefile user I'm trying to build a C++ app (C++11, OpenMP, OpenCV3, experimental filesystem) that works if I build directly, but fails if I use a makefile with a linker error. This works: g++ \ -std=c++11 -std=c++1y…
cdmh
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