I am trying to capture images from webcam using opencv. When i call cvQueryFrame() the image is read and the cam starts. I want cam to stop because it will be used by other application.
Can anyone help me with this?
Thanks a lot.
Isn't cvReleaseCapture() working ?
I would just stop the frame query, (stop the loop you use to capture frame) and then simply release the capture...
Is it what you are searching for ?
Here is the documentation
Related
I am working with YOLOv4 for detection through IP Camera. I have a GUI for camera control. So I don't want the camera frame to show the detected objects. However, I want the detected objects and the percentage to be shown in the Command Prompt console. Is it possible to make that? If yes, please suggest the way. Thank You
Add -dont_show after the command
Hi I am receiving a stream on VLC through another PC. The Stream is working on ubuntu 16.04 but I also want to use the scene filter that saves frames to a folder. I am trying to use the scene filter in VLC but it is not working any suggestions will be greatly appreciated. Many thanks in advance.
Scene filter Image
I have been googling for solution to stop camera in motion. But could not find a better solution. I used this script from asset store. it does what it says but stops suddenly when i stop touching the device.
I need help to modify this script to achieve my goal.
Can you show me your line of code where you are moving camera? If you are using transform.position , try transform.Translate instead of using transform.position.
I have a analog camera connected to EasyCap video capture device. When I run a basic code which opens webcam video using OPENCV, I can access my in-built webcam but not the other analog camera.
How would you connect any other camera (FPV, IR, etc) to the PC such that OPENCV can access it.
Thanks.
i struggled with the same problem and hope it helps!
the original thread + ANSWER
also relevant XKCD
one more observation: from your description it looks like you already have a webcam running on the laptop (in-built webcam maybe?) you might want to disable it in system manager so as to guarantee that your analog camera cam_index is zero for certain. Otherwise if you leave the webcam enabled as a device, then your analog cam will most likely be incremented to cam_index=1 which amusingly enough seems to be confirmed by it crashing on cam_index=1.
Arguable not a great method to find your camera's index but there you have it!
You can set which camera to connect to open by changing the following deviceID to the desired device you want:
CvCapture* capture = cvCaptureFromCAM(deviceID);
or new API:
VideoCapture cap(deviceID);
Check out documenation for more info.
Use the deviceID of the analog camera instead of the in-built one.
It seems that the pyrlk_optical_flow.cpp sample code (opencv\samples\gpu) only works on two still images.
If so, do any of you know of examples of how to convert the code from still image input to streaming video or webcam input?
Any help is appreciated. Thank you.