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The result obtained by cuda::dft is different from cv::dft

I'm tring to speed up the cv::dft by using the gpu version, but I find the result obtained by cv::cuda::dft is different from cv::dft. Here's the code: CPU version: Mat t = imread(...) // read the src...

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Object Detection and Avoidance:Drone

I'm trying to build a project in which the drone will detect the obstacles in its way and try to avoid them. so trying to detect the trees, birds, the electric poles and wires mostly I have also gone...

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process has died,terminate called after throwing an instance of...

After I run: roslaunch tiago_opencv_tutorial keypoint_tutorial.launch The error Tips: > ... logging to /home/dell/.ros/log/44ec5218-d183-11ea-b335-54353005d2aa/roslaunch-skdr-5443.log Checking log...

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LNK1104 opencv_gapi440d.lib is missing

Hi everyone, I have the following problem: I want to use the example "Feature Matching with FLANN". Unfortunately I get the error message in Visual Studio 2017: LNK1104...

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Disparity Map vs. Triangulating Points

Hello, For my project I am only concerned about measuring 20 key points** in an image. From these 20 points I need their 3D location relative to my camera origin to make measurements. For this...

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compare two pictures of color

Hi, Whats the best method to compare two pictures of mainly black color , (or two pictures of mainly red color) I'm looking at a specific location on an image and am hoping to see a black colored wire...

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Finding corner points for perspective transform without clear landmarks.

Hi, I posted [this](https://answers.opencv.org/question/232957/apply-getperspectivetransform-and-warpperspective-for-bird-eye-view-python/) question two days ago, which leaded me to a new problem to...

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Compiling Tracker from tutorial leads to error: ‘Tracker’ was not declared in...

Hello, I have been using opencv in python without issues. I am now trying to switch to cpp, which I am new to. I have recently reinstalled opencv and compiled it with...

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Can anyone confirm link to recommended install for 4.4 on Windows, Python?

Just seems to be a few procedures and not sure if they are current. Pip not available yet, so looking to construct manually.

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why seam_finder gc_color result is changing over iteration?

HI everybody, I'm looking at seam_finder results, GC_COLOR in detail stitching, OPENCV 4.2..0. I noticed that the result is changing over iterations on some fixed pictures. (using "--blend no" to be...

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.set() is not working for brightness and exposure on Macbook

Hi, I m using opencv 4.1.2 and Macbook to set camera properties but continously getting False in response for brightness and exposure while height and width are fine. Macbook OpenCV 4.1.2 Logitech Brio...

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how to read a YML vector in python

OPENCV 4.2 I record a vector in C++ vector myVector; //... filling vector somewhere ... name = "myVector"; // storing vector myFileStorage << name << myVector; This gives an YML file...

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DISP_SHIFT in cv::StereoMatcher

Hi all, Does anyone know, what is DISP_SHIFT in the class StereoMatcher ? Thx

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Parallelizing GPU processing of multiple images

For each frame of a video, I apply some transformations and then write the frame out to an image file. I am using OpenCV's CUDA API for this, so it looks something like this, in a loop: # read frame...

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Unable to create PAGE_LOCKED or SHARED host memory using the Python binding...

- NVIDIA Jetson Xavier NX - OpenCV 4.4 built with CUDA support - Python 3.6.9 I'm having trouble with the Python binding to the HostMem class and can't create PAGE_LOCKED or SHARED host memory. I'm not...

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VideoCapture properties not being set in Opencv c++

Hello All, I have been trying to set my camera resolution to lower than the default resolution of the camera. For that, I have written following code after the video capture object initialization,...

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How to build viz module with VTK 9.0.1?

Hi all. I would like to build OpenCV with viz module using VTK 9.0.1. Environments: OS: Windows 10 x64 IDE: Visual Studio 2015 SDK: OpenCV 4.4.0, VTK 9.0.1 CMake: 3.17.0-rc1 I referred this link:...

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Difference in BGR values between C++ and Python

Hello, I'm using OpenCV in C++ and Python and compare the results. I noticed that BGR values slightly differ (+/- 1, sometimes +/- 2) between those two languages after reading the same frame from a...

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Warning: field of class type without a DLL interface used in a class with a...

Issue when building OpenCV 4.4.0 from source. When I build "ALL_BUILD" and "INSTALL" projects using VS2019 Windows10 I got 2000 somthing warnings (only warnings no errors at all) saying: "Warning:...

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com.org.opencv.FpsMeter is defied multiple times Android Studio

I'm working on face recognition on Android studio using OpenCV and JavaCv. I'm using Haar cascade of OpenCV for face detection and LBPH for face recognition with the help of javaCv library. In the...

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