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Questions tagged [frame-grab]

17 questions
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Frame Capture using Matrox Commands

I'm working on a project where I have to set the fps of a video stream (as 10) from a camera and grab a frame every 5th frame. I'm working on a program that has already been half written by someone else. The thing is, they have used Matrox…
DetectiveFishLegs
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How to capture an image using Frame Grabber device in C#?

Trying to capture image using frame grabber device by implementing G-API, but I am not able to access internal functions from G-API. After creating object, functions still not able to access. Here is the link for G-API LINK. However, I am not able…
DevSay
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Capture image from multiple cameras at the same time instant

My setup consists of 3 USB 2.0 cameras connected to a USB 3.0 hub and then connected to computer. Cameras are independent of each other and the hardware is not synchronized. Goal is to capture an image from all these camera when an event occur, in…
BhanuKiran
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Grab an exact image at exact time in FFMpeg video?

I am trying to build a project in java that uses this library: https://github.com/bytedeco/javacv I want to use the FFmpegFrameGrabber to get an exact frame of a video, but the only methods I see are FFmpegFrameGrabber.grab(). How does this know…
hermt2
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Matlab: 3 uint8's to two 12 bit numbers

I have a frame grabber that is returning R, G, B matrices (So, X, Y, {R,G,B}) But I need to slice up the data to 2 12 bit vectors; I'm unsure how to do this quickly (converting everything to strings is terrible). If someone could help me out, I'd…
Travis
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How to grab video frame from hardware overlay (not from my app)?

I've been looking for a way to grab a frame from a video currently in the hardware overlay, and I've not found anything solid. Everything I find is either for grabbing frames from a video you are playing (in your app) or creating a filter to which I…
Bikonja
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pylablib.devices.IMAQ.IMAQ.IMAQCamera: read_trigger method is not asserting when external trigger is pressed

I am working on a script which grabs frames from a c-arm camera using a PCIe-1433 frame grabber. The frames must be grabbed when a pedal is pressed down; pressing and holding the pedal results in a repeated rising voltage edge at a consistent rate…
jjcrouch
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Is MdigGrab in Matrox imaging library give color image or B/W

I am using Matrox Morphis QxT with 16 channel frame grabber. When using in-built functions MdigGrab and MdigGrab continuous, I am getting a black and white image from my camera (Watec 221S2). I want colour images from the camera. I tried writing my…
A.k.
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Frame grabbing with Matrox

I'm trying to run Matrox Image Library's example code for frame grabbing. When the application runs, all I get is a black screen for the display image. I know my configuration is correct, since when I try Matrox Intellicam software, I'm able to grab…
aek8
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QCameraInfo not recognising multiple cameras from frame grabber

I have developed an application to show the camera output. Cameras are connected using the frame grabber card (PCIe with two channels). The strange part is that I can only see one device output. Moreover the QCameraInfo is also detecting just one…
sulabh
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How to process frames from a VGA2USB device using opencv c++?

Dear members of stack overflow, hi: I have just learned a little bit of opencv in VC++. Now, I faced a new problem: I want to input my video frames from an EPIPHAN VGA2USB device. So, I installed the device drivers, downloaded its SDK, and opened…
Roohollah
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Frame grabbing with VLC

I used VLC.DotNet dlls to play my RSTP/h.264 stream in my WPF application. Now, I need to process some frames of this stream. Does VLC.DotNet have any methods for frame grabbing?
Zhr Saghaie
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Diagnosing Slow Write Speed Issue

So I hope someone can help me with this question which might seem obvious to anyone with any amount of programming experience but not to me! Please excuse my poor descriptions since I don't know the right terminology for a lot of things. Basically…
afid_difa
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Android - Real time modifying output of video file

I've been strugling with this for some time now, found some topics about using TextureSurface, FFmpegFrameGrabber etc but still dont have a clue. I would like load a video file, than take a frame and make some modifications ( process frame using…
user3438183
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How to implement ISampleGrabber to be used on Windows CE 7

I tried to reuse the code from here http://www.codeproject.com/Articles/28790/Creating-Custom-DirectShow-SampleGrabber-Filter-fo To implement the SampleGrabber that I need to capture frames from a Camera on Windows CE 7. The problem is compiling…
Patrik
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