text stringlengths 36 4k | label stringclasses 4
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COLOR_RGB2Lab is not reliable for float32 values
### System Information
OpenCV python version: 4.8.0.74
Operating System / Platform: Win11
Python version: 3.11 x64
### Detailed description
The convert color function does not convert all RGB-values to the correct corresponding L*a*b*-Values if the RGB values are of ... | question | opencv/opencv | nlbse2024 |
Cross compiling ARM64 in Windows x86_64 fails
### System Information
OpenCV version: 4.7.0
OS: Windows 11
Compiler & version (as reported by cmake)
-- Building for: Visual Studio 17 2022
-- The C compiler identification is MSVC 19.37.32822.0
-- The CXX compiler identification is MSVC 19.37.32822.0
### Detailed descr... | question | opencv/opencv | nlbse2024 |
Does "cv::VideoCapture" have any thread lock?
### System Information
OpenCV python version: 4.8.0.76
Operating System / Platform: MacOS 14 && Windows 11
Python version: 3.11.5
### Detailed description
VideoCapture Multithreading
### Steps to reproduce
- When i using ThreadPool,
```python
import cv2
import time
... | question | opencv/opencv | nlbse2024 |
Opencv includes not found after build
### Describe the doc issue
Hello,
I built the Opencv using cmake.
Now i need to add OPencv into my application and call its functions.
I could not find the include\\version.hpp to include in my application.
(header file)
Your input is appreciated.
### Fix suggestion
Hello... | question | opencv/opencv | nlbse2024 |
Can cv2.VideoCapture read 4 channel video?
### Describe the doc issue
I want to read 4 channel video, using:
```
cv2.VideoCapture(path)
while True:
ret, frame = video.read()
```
But, I find the frame is 3 channel,
### Fix suggestion
_No response_ | question | opencv/opencv | nlbse2024 |
faceRecognizerSF.feature(alingCrop, feature) Always return the same features for different faces
### System Information
[OpenCV version: 4.7.0](https://github.com/opencv/opencv/releases/download/4.7.0/opencv-4.7.0-windows.exe)
Operating System / Platform: win11
```
<dependency>
<groupId>org.bytedeco</groupId>
<art... | question | opencv/opencv | nlbse2024 |
imshow not implemented
### System Information
**OpenCV version**: 4.8.0 (also occurs in version 4.7.0)
**Operating system**: Windows
**Compiler**: Microsoft Visual C++ v19.36.32535 (x86)
### Detailed description
**My code is in C++.**
I'm using the HighGUI module (`#include "opencv2/highgui/highgui.hpp"`), and it ... | question | opencv/opencv | nlbse2024 |
Rotate Parameter for putText() function
### Describe the feature and motivation
I am trying to rotate my putText() without rotating the whole frame. But it seems like a hard thing to do. Is it possible to add a new "Rotate" parameter to putText() function?
TIA
### Additional context
_No response_ | question | opencv/opencv | nlbse2024 |
How to cite OpenCV?
### Describe the doc issue
I write a paper with OpenCV, and I want to cite OpenCV in my paper. So can I cite OpenCV in my paper.
### Fix suggestion
_No response_ | question | opencv/opencv | nlbse2024 |
Ordering of images in stitcher
I was performing a 360 degree images stitch operation using SIFT for feature extraction and Brute force matcher for matching.
I observed that the order of images which I provide does not matter as the output I get is in different order.
I used following program for stitching [Stitching d... | question | opencv/opencv | nlbse2024 |
error: 'Mutex' in namespace 'cv' does not name a type AND error: 'recursive_mutex' in namespace 'std' does not name a type
### System Information
OPENCV version 4.7.0-dev
**Host platform OS**: Ubuntu 22.10
**Cross Compiler used for compilation** - arm-none-eabi-gcc (version gcc-arm-none-eabi-10.3-2021.10)
Used Cmake-... | question | opencv/opencv | nlbse2024 |
How to compile OpenCV into a single static library file?
### Describe the feature and motivation
I compiled using -DBUILD_opencv_world=ON -DBUILD_SHARED_LIBS=OFF, which resulted in libopencv_world.a in the lib directory and several .a files in the lib/opencv/3rdparty/ directory. I would like to merge all the .a files... | question | opencv/opencv | nlbse2024 |
Image Reshape in c++
- Input image = cv::dnn::blobFromImage(image, ScaleFactor, cv::Size(Width, Height), false, false);
- This function return 1 x 3 x Width x Height.
- But some model requested 1 x Width x Height x 3.
- In case difficult to reshape image.
- How to convert 1 x 3 x Width x Height image size to 1 x Width... | question | opencv/opencv | nlbse2024 |
Creating an ROI on a live video
### System Information
Jetson AGX Xavier
Jetpack 4.6.1
Opencv 4.1.1
CMake 3.23.1
### Detailed description
I am trying to create an ROI on a live video and for a while it seems to work but after some time the programme seems to think the ROI has moved out of the image plane. I'm not t... | question | opencv/opencv | nlbse2024 |
Cannot load TensorFlow SavedModel created with Teachable Machine
### System Information
OpenCV version: Current Branch 4.x
Operating System: Windows 11
Compiler: Visual Studio 17 2022, Win32 Release build
### Detailed description
I built a simple model with Teachable Machine and downloaded it in the Saved Model for... | question | opencv/opencv | nlbse2024 |
The parameter patternSize behaves unexpected in findCirclesGrid()
### System Information
OpenCV python version: 4.7.0.72
Operating System / Platform: macOS 13.3.1
Python version: 3.10.10
### Detailed description
According to the [documentation](https://docs.opencv.org/3.4/d9/d0c/group__calib3d.html#gad1205c4b803a21... | question | opencv/opencv | nlbse2024 |
How about Edges?
### Descripe the feature and motivation
They can be detected using edge detection algorithms like Sobel, Canny, or Laplacian. Edges are useful for tasks like object detection, image segmentation, and feature matching.
### Additional context
_No response_ | question | opencv/opencv | nlbse2024 |
Does DNN support intel N100 processor
I'd like to buy a mini PC with intel N100 processor. I am not sure if "cv2.dnn.readNetFromTensorflow" support the new processor. I use the function to detect face in real time. Thanks in advance for your help! | question | opencv/opencv | nlbse2024 |
How to image process the on the original image like the of the given output.
### System Information
I have this image Original Image:-
,And after processing it above we want the following output [output... | question | opencv/opencv | nlbse2024 |
OpenCV no longer builds with Cuda 12.0.1
### System Information
OpenCV version: 4.6.0
Operating System / Platform: Gentoo Linux
Compiler & compiler version: GCC 12.2.1_p20230121-r1
### Detailed description
Fails to build due to missing symbols.
[build.log](https://github.com/opencv/opencv/files/10737886/build.log)... | question | opencv/opencv | nlbse2024 |
Colud we use USAC with PNP?
### Descripe the feature and motivation
Because using RANSAC with PNP shows bad effects.
### Additional context
_No response_ | question | opencv/opencv | nlbse2024 |
Unable to compile 4.5.5 with ARM
### System Information
OpenCV version: 4.5.5
Operating System / Platform: Ubuntu 18.04
Compiler & compiler version: GCC 7.5.0
### Detailed description
I tried to build opencv through the options of the command in **Steps to reproduce**.
However, I checked the following error message... | question | opencv/opencv | nlbse2024 |
putText() documentation is misleading about origin point
### Descripe the doc issue
There is a mistake in ```putText()``` function documentation:
https://docs.opencv.org/4.x/d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576
https://github.com/opencv/opencv/blob/540aa13300b2aede45d328a228f79fb26ad1a... | question | opencv/opencv | nlbse2024 |
Unable to run the Simple RTSP program in docker
OpenCV => 4.7
Operating System / Platform => ubuntu 20.04
Compiler => python
I need to take and RTSP stream which is currently from VLC player rtsp://localhost:8554 to the program running inside the docker and the docker container has to give the video output. for that ... | question | opencv/opencv | nlbse2024 |
How disable MT default on MSVC?
### Descripe the doc issue
Got errors when link opencv.lib with Unreal Engine:
```
检测到“RuntimeLibrary”的不匹配项: 值“MT_StaticRelease”不匹配值“MD_DynamicRelease”(SharedPCH.Engine.ShadowErrors.h.obj 中)
```
UE default using MD, but opencv default using MT
How to enable MD while still using sta... | question | opencv/opencv | nlbse2024 |
cv::setNumThreads does not work with Apple GCD
### System Information
OpenCV version: 4.7.0
OS: macOS 13.0.1 on Apple M1
Compiler: Apple clang version 14.0.0 (clang-1400.0.29.202) Target: arm64-apple-darwin22.1.0
### Detailed description
Compile OpenCV with default configuration, which results in using GCD for para... | question | opencv/opencv | nlbse2024 |
Avoid using system zlib
### Descripe the feature and motivation
How to forely using static build zlib rather than system one?
### Additional context
How to forely using static build zlib rather than system one? | question | opencv/opencv | nlbse2024 |
Error trying to build OpenCV 4.5.5 with OpenVINO 2023.2
### System Information
OpenCV version: 4.5.5
Operating System / Platform: Windows 10
Inference Engine (OpenVINO) version: 2022.3
Python version: 3.9.6
### Detailed description
Hey guys,
So basically I was trying to build OpenCV 4.5.5 with OpenVINO 2022.3 and ... | question | opencv/opencv | nlbse2024 |
How to disable zlib?
### System Information
I using `BUILD_ZLIB=OFF`, but it still calls some `gzgets` API from zlib.
And I found in code, it hard coded:
<img width="510" alt="image" src="https://user-images.githubusercontent.com/21303438/209456235-b80431de-a5c2-4e68-a207-a8e48f35d962.png">
Am confused here... how... | question | opencv/opencv | nlbse2024 |
OpenCV contrib attribute not found - AttributeError: module 'cv2' has no attribute 'face'
### System Information
In case you get `AttributeError: module 'cv2' has no attribute 'face'` (or any other [module](https://github.com/opencv/opencv_contrib/tree/4.x/modules) (`rgbd`, `ximgproc `, `bgsegm`, etc.) and you alread... | question | opencv/opencv | nlbse2024 |
An nparray that uses an inconsistent save from cv2.imwrite
### System Information
// example for python user
OpenCV python version: 4
Operating System / Platform: Ubuntu 20.04
Python version: 3.8
### Detailed description
I ran the following code, The outputs should be the same. Why are they different?
### Steps to... | question | opencv/opencv | nlbse2024 |
Give it option to build opencv x86 static lib on a ARM M1 mac
### Descripe the feature and motivation
Give it option to build opencv x86 static lib on a ARM M1 mac.
Currently, whenever enviroment set, opencv always build arm static on a arm mac, this is no problem, but sometimes users need x86 lib on M1 mac, For exa... | question | opencv/opencv | nlbse2024 |
android jni VideoCapture can't open videofile
### System Information
OpenCV version: 4.6.0
Operating System / Platform: android 12
Compiler & compiler version: cmake 3.10.2
### Detailed description
```
E/cv::error(): OpenCV(4.6.0) Error: Requested object was not found (could not open directory: /data/app/~~sbu7r1TB... | question | opencv/opencv | nlbse2024 |
Protobuf compatibility...
### Descripe the feature and motivation
My **ENV**:
- Ubuntu 22.04
- gcc: (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
- Protobuf: 3.20.3
- OpenCV 4.6.0 (building)
Failed to build **OpenCV dnn caffe** with this version of **Protobuf**:
```console
/usr/local/include/google/protobuf/arenastring.h:... | question | opencv/opencv | nlbse2024 |
remap cv2
### System Information
OpenCV python version: 4.5.4.6
Operating System / Platform: Ubuntu 20.04
Python version: 3.8.1
### Detailed description
remap function cut end of image
I have x_coords and y_coord and use remap, but output missing end of image
![image](https://user-images.githubusercontent.com/423... | question | opencv/opencv | nlbse2024 |
Unable to build C++ solution using OpenCV 4.5.5 with OpenVINO 2021.4.689
### System Information
OpenCV version: 4.5.5
Operating System / Platform: Ubuntu 18.04
CUDA version: 11.2
CuDNN version: 8.1.0
### Detailed description
Hey,
So my ultimate goal is to build OpenCV 4.5.5 with support for CUDA 11.2 and OpenVINO ... | question | opencv/opencv | nlbse2024 |
The ARM32 Linux platform uses opencv3.4.1
### Descripe the doc issue
Hello, I use the ARM32 Linux platform and the operating system is Ubuntu16.04. After compiling Opencv3.4.1 with the cross-compiler, the following errors occurred when I generated an opencv program separately:
The above is my error information
![图片](... | question | opencv/opencv | nlbse2024 |
Unable to link statically to OpenCV 4.2
### System Information
OpenCV version: 4.2
Operating System / Platform: Ubuntu 20.04
Compiler & compiler version: GCC 9.4.0
### Detailed description
I am trying to build a shared library that uses OpenCV. I have openCV installed via `apt-get install libopencv-dev` in the dock... | question | opencv/opencv | nlbse2024 |
Scan Image Coords issues
### System Information
We use opencv version 4.5.4. Even the issue is there on the opencv version 3.4.2 also.
"cv::Exception: OpenCV(4.5.4) /home/runner/work/opencv/opencv/opencv-4.5.4/modules/imgproc/src/resize.cpp:4051: error: (-215:Assertion failed) !ssize.empty() in function 'resize'
"
W... | question | opencv/opencv | nlbse2024 |
How to infer unet by opencv?
### Descripe the feature and motivation
Is there any example with ".cpp" or ".py" I can refer to unet inference？
so:
https://github.com/opencv/opencv/blob/master/samples/cpp/segment_objects.cpp
This can be used to unet inference? please help me.
### Additional context
_No response_ | question | opencv/opencv | nlbse2024 |
When compiling opencv4.5.5, I find that the objdetect module is not compiled.
### System Information
When compiling opencv4.5.5, I find that the objdetect module is not compiled.
The libopencv_objdetect.so and libopencv_objdetect4.5.so files are not found in the lib directory.
In addition, the objdetect module is inc... | question | opencv/opencv | nlbse2024 |
Getting Bad argument (Can't read ONNX file: .\\yolov5s.onnx) When Trying to Load YOLOv5 ONNX Model.
### System Information
OpenCV version 4.6.0
Operating System / Platform: Windows 11 Pro (22000.1098)
Compiler & Compiler Version: Microsoft Visual C++ Compiler (MSVC Toolset) v142 (Visual Studio 2019)
### Detailed des... | question | opencv/opencv | nlbse2024 |
'haarcascade_fontalface_default.xml' in read mode
### Descripe the doc issue
I'm very new to OpenCV and was just running my first program ever in the terminal when I get the phrase:
[ERROR:0@0.012] global /Users/runner/work/opencv-python/opencv-python/opencv/modules/core/src/persistence.cpp (505) open Can't open fil... | question | opencv/opencv | nlbse2024 |
cv::VideoCapture will affect GPU performance?
My model takes 6ms when testing a single frame of image, but it takes 8ms when using cv::VideoCapture to get video frame , and after dozens of inferences the time-consuming increases to 12ms.
Win10
Opencv version 4.6 | question | opencv/opencv | nlbse2024 |
OpenCV iOS use in 2022
Hello, I am just getting into OpenCV and want to understand the following:
1. As I understand OpenCV [doesn't support Metal](https://github.com/opencv/opencv/issues/4898), so as a result there is no way for OpenCV to use GPU on iOS devices. Is that correct ?
2. Is my understanding correct that ... | question | opencv/opencv | nlbse2024 |
Why is the image merge area white
I don't know why two pictures merged, the overlapping area is white
I hope the teacher can give me a solution
this my scripts：
```
private void WarpTriangle(Mat ... | question | opencv/opencv | nlbse2024 |
Bug (Javascript) mean/meanStdDev broken for 8UC3 images
<!--
If you have a question rather than reporting a bug please go to https://forum.opencv.org where you get much faster responses.
If you need further assistance please read [How To Contribute](https://github.com/opencv/opencv/wiki/How_to_contribute).
This is a ... | question | opencv/opencv | nlbse2024 |
In file included from /home/xxx/opencv/modules/python/src2/cv2.cpp:11:0: /home/xxx/opencv/build/modules/python_bindings_generator/pyopencv_generated_include.h:19:10: fatal error: opencv2/hdf/hdf5.hpp: no file or directory #include "opencv2/hdf/hdf5.hpp" ^~~~~~~~~~~~~~~~~~~~~~
I'm building opencv-cuda,it happens at the... | question | opencv/opencv | nlbse2024 |
How to build for FreeBSD 13.1 ?
System information (version):
- OpenCV => 4.6.0
- Operating System / Platform => FreeBSD 13.1
- Compiler => clang/llvm and gcc 11
-KDE5 plasma
Has anyone able to compile OpenCV 4.6.0 successfully for FreeBSD 13.1?
If so what was used to compile opencv and also what commands was used?... | question | opencv/opencv | nlbse2024 |
how opencv load .dylibs under macos
im working on python==3.9.12, macox==12.5
i import cv2 as cv, and i find the some dylib under cv2/.dylibs are loaded, but i can't find out where the code loads them.
i need help!!!! | question | opencv/opencv | nlbse2024 |
Failed to install opencv 4.6.0 on ubuntu
<!--
If you have a question rather than reporting a bug please go to https://forum.opencv.org where you get much faster responses.
If you need further assistance please read [How To Contribute](https://github.com/opencv/opencv/wiki/How_to_contribute).
This is a template helpin... | question | opencv/opencv | nlbse2024 |
fatal error
cloning_demo.cpp:23:10: fatal error: opencv2/photo.hpp: No such file or directory
23 | #include "opencv2/photo.hpp"
| ^~~~~~~~~~~~~~~~~~~
compilation terminated. | question | opencv/opencv | nlbse2024 |
How to quickly convert RGB to YUV422
Hello ，I am using `cvtColor` will RGB to YUV422.
But This funciton param `mode` don't have BGR2YUV(422).
I use the in-down method to transform
```
void cvtcolor_rgb2yuv422(cv::Mat& rgb, cv::Mat& yuv) {
cv::Mat yuv444(rgb.rows, rgb.cols, CV_8UC3);
cv::cvtColor(rgb, yuv444, CV_B... | question | opencv/opencv | nlbse2024 |
can OpenCV 3.4.16 using cuda 11.6?
can OpenCV 3.4.16 using cuda 11.6? | question | opencv/opencv | nlbse2024 |
How to automatically obtain the input image size from the ONNX model？
Is there a function in `OpenCV DNN` that automatically gets the input image size from the only `ONNX` model？
thanks | question | opencv/opencv | nlbse2024 |
error: 'off64_t' undeclared here (not in a function); did you mean 'off_t'?
<!--
If you have a question rather than reporting a bug please go to https://forum.opencv.org where you get much faster responses.
If you need further assistance please read [How To Contribute](https://github.com/opencv/opencv/wiki/How_to_cont... | question | opencv/opencv | nlbse2024 |
imshow() for .png transparent images with RGBA 4 channels
Looks like **imshow()** cannot show transparency correctly ?
I prefer **NOT** to show RGB some times, with alpha mask, how can I make the transparency displayed?
I can load, I can save, but with imshow(), I cannot display correctly.... | question | opencv/opencv | nlbse2024 |
Convcert cvMat to pcd file
Hi, I would like to convert a cv::Mat to PCL format. Have you an idea ?
Thanks | question | opencv/opencv | nlbse2024 |
Getting cv2.error
Above picture is the code and I am getting this error message which is shown below. Could anyone help me fix this issue?
 use video orientation
If the video orientation is available if should be used by default with reading frames.
- OpenCV => 4.X
- Operating System / Platform => Linux x64
- Compiler => gcc
##### Detailed description
By default imread for images use the EXIF orientation information.
If possible Vi... | question | opencv/opencv | nlbse2024 |
About debug
I debug OpenCV in one step, but I couldn't find the function entry of the matrix plus method. | question | opencv/opencv | nlbse2024 |
SyntaxError: invalid syntax --->frame = cv2.circle(frame, (int(a), int(b)), 5, color[i].tolist(), -1)
When I tried to use Lucas-Kanade on optical flow, I couldn't figure out why there's always invalid syntax when I use" frame = cv2.circle(frame, (int(a), int(b)), 5, color[i].tolist(), -1)"
Here's the code, guys pleas... | question | opencv/opencv | nlbse2024 |
How to properly use opencl acceleration applied to 360 surround view
360 surround view, multi-threaded processing of pictures from different cameras, opencv (4.5.5) for image correction and perspective transformation (remap), the CPU usage is very high, so use opencl (1.0) to accelerate, but with the increase of the n... | question | opencv/opencv | nlbse2024 |
cv2.drawFrameAxes broken
Using python 3.9, macOS 12.2.1, OpenCV 4.5.5 I am not getting the correct axes displayed.
The axes are defined as "OX is drawn in red, OY in green and OZ in blue." in the [reference docs](https://docs.opencv.org/3.4/d9/d0c/group__calib3d.html#gab3ab7bb2bdfe7d5d9745bb92d13f9564)
Using the cod... | question | opencv/opencv | nlbse2024 |
ORB FeatureDetector has different result between C++ and Python
I use ORB FeatureDetector to extract feature using Python and C++, code sees below. But the output results is different completely, I am sure my input is same, and OpenCV version all is 3.4.6. I am confuse, I need some help.
.
This is a... | question | opencv/opencv | nlbse2024 |
SystemError: <built-in function writeTextGraph> returned NULL without setting an error when using cv2.dnn.writeTextGraph
- OpenCV = 4.1.2
- Operating System / Platform = Windows 64 Bit
- Compiler = Google Colab
<!-- your description -->
So I recently created a machine learning model with Keras and saved it using the ... | question | opencv/opencv | nlbse2024 |
Error While Installing openCV 4.5.1 on Ubuntu 18.04 ( jetson nano production module).
##### System information (version)
<!-- Example
- OpenCV => 4.2
- Operating System / Platform => Windows 64 Bit
- Compiler => Visual Studio 2017
-->
- OpenCV => :grey_question:
- Operating System / Platform => :ubuntu 18.04:
- Compi... | question | opencv/opencv | nlbse2024 |
JS version cannot find the undistortpoints function 。how to compute distorted image points position in opencv.js？
<!--
If you have a question rather than reporting a bug please go to https://forum.opencv.org where you get much faster responses.
If you need further assistance please read [How To Contribute](https://git... | question | opencv/opencv | nlbse2024 |
common.hpp
```
##### System information
- OpenCV => 4.5.5
- Operating System / Platform => Windows 64 Bit
- Compiler => Visual Studio 2022
```
Hi
I just installing openCV, and I trying this code : https://docs.opencv.org/4.x/d5/de7/tutorial_dnn_googlenet.html
But, i have an error : VS2022 can not found "common.hpp".... | question | opencv/opencv | nlbse2024 |
Iplimage has not been declared
`#ifndef MM3D_H
#define MM3D_H
#include <math.h>
#include "3DMMGlobal.h"
//#include <cv.h> pf注释的,找不到这个文件
#include <opencv2/opencv.hpp>
#include <algorithm>
//#include <Windows.h> pf注释的,找不到这个文件
//#include <gl\\GL.h> pf注释的,找不到这个文件
//#include <GL\\GLU.h> pf注释的,找不到这个文件
using namespace std... | question | opencv/opencv | nlbse2024 |
Difference in predictions when running on GPU vs CPU
<!--
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If you need further assistance please read [How To Contribute](https://github.com/opencv/opencv/wiki/How_to_contribute).
This is a tem... | question | opencv/opencv | nlbse2024 |
Missing libraries in OpenCV 3.3.1
I tried installing opencv3.3.1 using the exe at https://github.com/opencv/opencv/releases/tag/3.3.1
However it seems to be missing some libraries that I need to run my application. How can I obtain the complete set of libraries?
![image](https://user-images.githubusercontent.com/92061... | question | opencv/opencv | nlbse2024 |
Why are there 3 compiled dynamic libraries? What's the difference between them?
<img width="200" alt="5738e7a7591e792495cc5b2252574c2" src="https://user-images.githubusercontent.com/48303408/163294064-57e147bd-e087-452d-8c52-30026710ba29.png"> | question | opencv/opencv | nlbse2024 |
`cv.imdecode` can't open the dib(bmp) images from clipboard
##### System information (version)
- OpenCV => opencv-python 3.5.5
- Operating System / Platform => win10
- Compiler => pre-compiled
##### Detailed description
`cv.imdecode` can't open the dib(bmp) images from clipboard, but can from file
##### Steps to rep... | question | opencv/opencv | nlbse2024 |
Python and Java don't decode JPG in the same way
##### System information (version)
- OpenCV => 4.5.3
- Operating System / Platform => Linux/Debian
- Compiler => System default
##### Detailed description
JPG images read from python or java aren't exactly equal.
I would expect that they get decoded to exactly the sam... | question | opencv/opencv | nlbse2024 |
Undefined symbols for architecture arm64: "std::__1::basic_istream, (built on m1 mac)
I followed that instructions on #21571 and successfully built an xcframework. When I tried to import it the follow error show.
`Undefined symbols for architecture arm64:
"std::__1::basic_istream<char, std::__1::char_traits<char> >:... | question | opencv/opencv | nlbse2024 |
some issue with cmake and opencv
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OpenCV: Include directory doesn't exist: '/usr/local/stow/absl/include/opencv4'. OpenCV installation may be broken.
System information (version)
OpenCV 4.5.5
Operating System Linux Ubuntu 20.04
cmake&make&install:
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_EXTRA_MODULES_PATH=/ho... | question | opencv/opencv | nlbse2024 |
readNetFromTensorflow don't work
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confused about the principle of cvFindExtrinsicCameraParams2() interface ?
could tell me about the principle of following code in cvFindExtrinsicCameraParams2() interface ? any theory or paper ?
```
// initialize extrinsic parameters
if( W[2]/W[1] < 1e-3)
{
// a planar structure case (all M's lie in the same plane)
... | question | opencv/opencv | nlbse2024 |
cv::cudacodec::VideoReader throw_no_cuda
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undefined reference to `cv::Mat::Mat(int, int, int, cv::Scalar_<double> const&)'
When I ran this code, It went wrong.
##### Detailed description
cv::Mat M(2,2,CV_8UC3,cv::Scalar(0,0,255));
##### System information (version)
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opencv 4.5.3(code in question pulled from [here](https://github.com/opencv/opencv/tree/... | question | opencv/opencv | nlbse2024 |
Inconsistant conversion from BGRA to BGR on png image
##### System information (version)
- OpenCV => 4.5.5
- Operating System / Platform => Ubuntu 20.04
- Compiler => g++
##### Detailed description
Usually in opencv, the conversion from BGRA to BGR via `IMREAD_COLOR` or `cvtColor` set the transparent background as b... | question | opencv/opencv | nlbse2024 |
Unable to launch app with brew version OpenCV 4.5.5 linked
##### System information (version)
- OpenCV => 4.5.5
- Operating System / Platform => macOS 11.6.4 (Apple M1)
- Compiler => Apple clang version 13.0.0 (c++)
##### Detailed description
When I write CMakeFiles.txt to link OpenCV 4.5.5 installed by brew, the bu... | question | opencv/opencv | nlbse2024 |
CMake detects a non-existent external dependency
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undefined reference to `google::protobuf::internal::InitSCCImpl(google::protobuf::internal::SCCInfoBase*)'
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Cannot write files in ProRes codecs
I am attempting to write a video file using opencv in the ProRes 4444 codec. I have tried other codecs, such as XVID, and the code works perfectly, however no ProRes codec of any kind seems to be working.
Relavent code:
//Above code specifies clipName, which increments for each cli... | question | opencv/opencv | nlbse2024 |
Opencv error with GPU backend
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Warning: libmediandk.so, needed by ../../lib/arm64-v8a/libopencv_videoio.so, not found (try using -rpath or -rpath-link)
Hi I was trying to cross compile opencv for android. My NDK version is 19 and API Level is 28. The make is crashing stating warning: libmediandk.so, was not found. Any guidance on rectifying the iss... | question | opencv/opencv | nlbse2024 |
Unable to Compile GAPI Code returning contours from cv::gapi::findContours
##### System information (version)
- OpenCV => 4.5.5
- Operating System / Platform => Windows 10 64 Bit
- Compiler => Visual Studio 2017 c++14 & 2022 c++14,17,20
##### Detailed description
I have compiled version 4.5.5 on windows with Visual S... | question | opencv/opencv | nlbse2024 |
How to confirm the version of the OpenCV 3rdParty libs
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relocation R_X86_64_PC32 against symbol `ff_pw_9' can not be used when making a shared object; recompile with -fPIC
##### System information (version)
```
Detected processor: x86_64
Could NOT find PythonInterp (missing: PYTHON_EXECUTABLE) (Required is at least version "2.7")
Looking for ccache - not found
Found ZLIB: ... | question | opencv/opencv | nlbse2024 |
compile opencv with inference-engine
hello when I use cmake to compile opencv with inferenceEngine I get problem next:
how to solve it | question | opencv/opencv | nlbse2024 |
Android NDK 23b LTS Compile Error
Hey! Please advise changes required I can PR fixes
Following Error for arm64/x86/x86_64 when targeting NDK 23b
```
Error at /opt/homebrew/Cellar/cmake/3.22.1/share/cmake/Modules/Platform/Android-Determine.cmake:584 (message):
Android: CMAKE_ANDROID_ARM_MODE is set but is valid only... | question | opencv/opencv | nlbse2024 |
haarcascade_frontalcatface muslim women detection
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[ONNX] inference different result between Python and C++
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add Intel® oneAPI DPC++/C++ Compiler (icx)
Intel® C++ Compiler Classic (icc) is deprecated and will be removed in a oneAPI release in the second half of 2023 ([deprecation notice](https://community.intel.com/t5/Intel-oneAPI-IoT-Toolkit/DEPRECATION-NOTICE-Intel-C-Compiler-Classic/m-p/1412267#:~:text=Intel%C2%AE%20C%2B%... | feature | opencv/opencv | nlbse2024 |
CUDA compilation is not using ccache
### System Information
OpenCV version: 4.8.0
Operating System / Platform: Ubuntu 20.04.6 LTS
Compiler & compiler version: GCC 9.4.0
CUDA: 11.4
### Detailed description
Using ccache 3.7.7 (Ubuntu version) or latest version (4.8.2), ccache is found by OpenCV's cmake but used only ... | feature | opencv/opencv | nlbse2024 |
Convert BGR to RGB NOW!!!
### Describe the feature and motivation
"The reason why the early developers at OpenCV chose BGR color format is probably that back then BGR color format was popular among camera manufacturers and software providers. E.g. in Windows, when specifying color value using COLORREF they use the BG... | feature | opencv/opencv | nlbse2024 |
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