opencv-samples | OpenCV sample codes | Computer Vision library

by wellflat C++ Version: Current License: BSD-3-Clause

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kandi X-RAY | opencv-samples Summary

opencv-samples is a C++ library typically used in Artificial Intelligence, Computer Vision, OpenCV, Numpy applications. opencv-samples has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

OpenCV sample codes (C++/Python)

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opencv-samples has a low active ecosystem.

It has 24 star(s) with 9 fork(s). There are 4 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 0 have been closed. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of opencv-samples is current.

Quality

opencv-samples has no bugs reported.

Security

opencv-samples has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

opencv-samples is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

opencv-samples releases are not available. You will need to build from source code and install.

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Community Discussions

Trending Discussions on opencv-samples

Change cuda::GpuMat values through custom kernel

Can not run opencv_createsamples on Arch Linux

How to use OpenCV with camera on Jetson Nano with Yocto/poky

No ethernet access on jetson nano with custom yocto image

Oracle JDK installation on Yocto build

JAVA installation error on Yocto build

libc6-i386 installation on Yocto build

QUESTION

Change cuda::GpuMat values through custom kernel

Asked 2020-Dec-07 at 07:01

I am using a kernel to "loop" over a live camera stream to highlight specific color regions. These can not always be reconstructed with some cv::thresholds, therefor I am using a kernel.

The current kernel is as following:

...

ANSWER

Answered 2020-Dec-07 at 07:01

As mentioned by @sgarizvi in the comments the cv::cuda::GpuMat already resides in the Gpu, so I had to use cudaMemcpyDeviceToDevice instead of cudaMemcpyHostToDevice.

It was also not necessary to allocate new memory, which was achieved deleting the cudaMalloc and cudaFree parts of the code above.

At last (just in this case, might be different for others) my Image input was the Zed 2 from StereoLabs, which publishes its images in RGBA so the order inside the memory is R -> G -> B -> A, converted to OpenCV it is B -> G -> R -> A which are 4 steps per pixel:

Source https://stackoverflow.com/questions/65126907

QUESTION

Can not run opencv_createsamples on Arch Linux

Asked 2019-Oct-22 at 08:12

I've installed opencv and opencv-samples on my arch linux. But when I try to run opencv_createsamples, I get an error opencv_createsamples: command not found I've tried to install opencv by pacman and by pip. The result is the same. Do anybody know how to fix this problem? Will be thankful for any help

...

ANSWER

Answered 2019-Oct-22 at 08:12

Have a look at: https://github.com/opencv/opencv/issues/13231

alalek commented on 21 Nov 2018

These apps has been disabled during legacy C API removal. Rewriting them with C++ API was not an option because it is too easy to break them and hard to test.

[...]

Consider using these apps for training from 3.4 branch for Cascade Classifier. Model format is the same between 3.4 and 4.x.

newer opencv versions do not include the cascade training binaries anymore (because opencv tries to get rid of the old C code). Try an older opencv version. Cascade classifiers trained with older opencv version binaries should still be usable with the latest opencv lib for object detection.

Source https://stackoverflow.com/questions/58499194

QUESTION

How to use OpenCV with camera on Jetson Nano with Yocto/poky

Asked 2019-Oct-01 at 11:03

I've created a minimal xfce image with Yocto/poky on a Jetson Nano using warrior branches (poky warrior, meta-tegra warrior-l4t-r32.2, openembedded warrior) and CUDA 10.

Image boots and runs perfectly, and the camera test:

...

ANSWER

Answered 2019-Oct-01 at 11:03

Use the following gstreamer pipeline:

stream = 'nvarguscamerasrc ! video/x-raw(memory:NVMM), width=%d, height=%d, format=(string)NV12, framerate=(fraction)%d/1 !nvvidconv flip-method=%d ! nvvidconv ! video/x-raw, width=(int)%d, height=(int)%d, format=(string)BGRx ! videoconvert ! appsink' % (1280, 720, 30,0, 640, 480)

cap = cv2.VideoCapture(stream,cv2.CAP_GSTREAMER)

This will solve the problem

Source https://stackoverflow.com/questions/57989992

QUESTION

No ethernet access on jetson nano with custom yocto image

Asked 2019-Sep-19 at 12:49

I've created a very minimal image for the jetson nano with the recepe:

...

ANSWER

Answered 2019-Sep-19 at 12:49

I ran the command:

Source https://stackoverflow.com/questions/57970792

QUESTION

Oracle JDK installation on Yocto build

Asked 2018-Jan-09 at 19:05

I'm trying to install Oracle JDK on my yocto build as it's needed to build the OpenCV Java API.

This is my configuration file:

...

ANSWER

Answered 2017-Dec-13 at 15:50

I couldn't installe Oracle JDK but I managed to install openjdk-8 and succesfully enable the OpenCV Java API.

I made a guide on how to accomplish this.

Source https://stackoverflow.com/questions/43156876

QUESTION

JAVA installation error on Yocto build

Asked 2017-Apr-06 at 08:37

I'm having a lot of trouble installing Java on my Poky Linux system. I'm building my system using Yocto with the following configuration:

local.conf

...

ANSWER

Answered 2017-Apr-06 at 08:37

I manually patched the files generating those error and builded the image. It gave a new error but successfully wrote the image. Java in installed:

Source https://stackoverflow.com/questions/43093838

QUESTION

libc6-i386 installation on Yocto build

Asked 2017-Mar-29 at 13:21

I'm trying add a Java installation on my Yocto build. I would like to run on my embedded system a Java application I developed but I can't correctly install Java. When I try to run java I get the following:

...

ANSWER

Answered 2017-Mar-28 at 18:01

For your information, you will need to do a lot of work in putting Java into your image.

Your current image does not have any java related programs installed since I do not see meta-java in your compile process.

CORE_IMAGE_EXTRA_INSTALL is restricted to OE Core images; So if you have your own image recipe, the variable will does not work unless you inherit core-image.bbclass

Here is an example on putting "openjdk-7-jre" to the image: http://wiki.hioproject.org/index.php?title=OpenHAB:_WeMo_Switch

The key elements are: meta-java, meta-oracle-java . You will need to add them to your conf/bblayers.conf

Source https://stackoverflow.com/questions/43074547

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