All Questions
1,305
questions
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1
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61
views
What is the best way to draw an CV_8UC1 matrix image with Cairo?
I have a matrix image in the format CV_8UC1, i.e. one byte per pixel of monochrome image data. I need to draw this matrix image using Cairo, i.e. to a Gtk drawing area. Speed is critical, as this ...
- 273
0
votes
0
answers
35
views
cvSaveImage compilation error on C OpenCV 3.4.20
Hello I try to get into OpenCV for my project. I download the version 3.4.20 that includes the deprecated C headers because my code is on C.
#include<stdio.h>
#include "opencv/opencv/...
- 25
0
votes
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answers
38
views
How to successfully introduce OpenCV when compiling a C project with Clion
I configured OpenCV through Cmake in Clion, but "error core.hpp header must be compiled as C++" occurred when building and compiling. This problem is in vs2022. I know how to deal with it. ...
- 1
1
vote
0
answers
67
views
How do i access pixel values of frames in deepstream pipeline
I am using probe to get data to a custom function and I need to access pixel value of the frames. I am trying to average video frames. How do I access it?
gst_pad_add_probe (osd_sink_pad, ...
- 11
0
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answers
46
views
OpenCV-dnn make fails: 'calling a __device__ function("operator float") from a __host__ function("clipped_relu_eltwise_sum_2_inplace") is not allowed'
I am following these instructions to build open-cv with GPU support:
https://techzizou.com/setup-opencv-dnn-cuda-module-for-linux/
My build command is
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D ...
- 1,211
1
vote
2
answers
952
views
Using opencv in the zig, error: lld-link: undefined symbol: cv::imread
I’m trying to use opencv withing the zig programming language, I tried to follow what I read on this stackoverflow post to use the opencv c++ library in the zig language, I created a opencv_binding.h ...
- 301
0
votes
0
answers
53
views
Send video stream from a webcam to a websocket in C
I'm trying to send the video stream from my webcam to a websocket in C. I've already etablish the websocket, but the video capture doen't work.
I'm trying to use mutex, but I get error during ...
1
vote
0
answers
198
views
Opencv calls the onnx model and reports an exception
I use yolov5 to train a data set myself, and then get an error through opencv:
C:\Users\admin\.conda\envs\yolov5\python.exe D:\Demo\yolov5\test_onnx.py
[ERROR:[email protected]] global onnx_importer.cpp:1054 ...
- 11
1
vote
0
answers
818
views
How to compile project with qcc
I'm on Ubuntu 20.4.6, I try to compile OpenCV using the qcc QNX compiler. In OpenCV build from source instructions they use the following command to generate their build files:
cmake -...
- 21
0
votes
0
answers
69
views
smoothening image boundaries for NxN kernel size
In my open source project ( https://github.com/mmj-the-fighter/GraphicsLabFramework ) i am trying to add a image smoothening box filter for NxN kernel size. I have already implemented the algorithm ...
- 139
0
votes
1
answer
291
views
how to compile c file using gcc and compile hpp using g++ in one project
I have C project needs to link opencv library, the c code must compile with gcc, if I compile the project using gcc then it report errors that opencv hpp header file must be compiled as C++. so, any ...
- 1
0
votes
1
answer
3k
views
How to use Opencv in C ( Gcc )
Hi.
my problme is in the Opencv Library
how can i use the Opencv Module in C coding Language ?
Is this library for Python , C# and C++ only?
can I use it in C ?
how can i downloaded it for C language ...
0
votes
0
answers
754
views
Output image data from HDMI port using C/C++/opencv on a windows 10 PC
I am working with a DMD (digital micromirror array) device Provided from TI (DLP3010EVM-LC). It is basically a projector that can be controlled through USB and HDMI. The HDMI is used to input external ...
- 1
0
votes
1
answer
415
views
C Win32 API display Opencv Image cv::Mat + Resizing, results in distorted, wrong colored images
So I've been looking for some simple code, on how I can display opencv images in a windows window, without using extra libraries. Most solutions that I have found use the StretchDIBits() method of the ...
- 11
1
vote
0
answers
153
views
How to catch ffmpeg stream with OpenCV C API?
I would like to read an ffmpeg stream from OpenCV C API.
The streamer I want to catch is generate using ffmpeg -f avfoundation -i "1" -pix_fmt uyvy422 -f mpegts udp://192.168.1.110:5000
I ...
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