An S4 Class Containing an OpenCV Stream

A Stream object contains an OpenCV stream that originates from a camera connected to the computer.

Function for creating Stream objects from video streams.

Usage

stream(..., api = "ANY")

Arguments

...

Either:

index:

An integer value corresponding to the index of the camera to read a stream from (default: 0; 0 is usually the default webcam on most computers). Or...

stream_string:

...a character string corresponfing to the URL of video stream (eg. protocol://host:port/script_name?script_params|auth) or a GStreamer pipeline string in gst-launch tool format if GStreamer is used as backend API. Note that each video stream or IP camera feed has its own URL scheme. Please refer to the documentation of source stream to know the right URL format.

api

A character string corresponding to the API to use for reading the stream from the camera (see Note; default: "ANY").

Value

A Stream object.

Slots

dim,ncol,nrow

Functions returning the dimensions of the object.

get,set

Functions to access and set internal properties of the object.

isOpened

Function to check the status of the camera stream.

readNext

Functions to access the next frame in the stream.

release

Function to release the object from memory.

Note

Hereafter is a list of all supported APIs. Note that not all APIs will be available on your computer (actually most of them will not be).

"ANY":

automatically select an API.

"VFW":

Video For Windows.

"V4L", "V4L2":

Video For Linux.

"FIREWIRE", "FIREWARE", "IEEE1394", "DC1394", "CMU1394":

IEEE 1394 drivers.

"QT":

Quicktime.

"UNICAP":

Unicap drivers.

"DSHOW":

DirectShow.

"PVAPI":

PvAPI, Prosilica GigE SDK.

"OPENNI":

OpenNI (for Kinect).

"OPENNI_ASUS":

OpenNI (for Asus Xtion).

"XIAPI":

XIMEA Camera API.

"AVFOUNDATION":

AVFoundation framework for iOS and OSX > Lion.

"GIGANETIX":

Smartek Giganetix GigEVisionSDK.

"MSMF":

Microsoft Media Foundation.

"WINRT":

Microsoft Windows Runtime using Media Foundation.

"INTELPERC":

Intel Perceptual Computing SDK.

"OPENNI2":

OpenNI2 (for Kinect).

"OPENNI2_ASUS":

OpenNI2 (for Asus Xtion and Occipital Structure sensors).

"GPHOTO2":

gPhoto2 connection.

"GSTREAMER":

GStreamer.

"FFMPEG":

FFMPEG library.

"IMAGES":

OpenCV Image Sequence.

"ARAVIS":

Aravis SDK.

"OPENCV_MJPEG":

Built-in OpenCV MotionJPEG codec.

"INTEL_MFX":

Intel MediaSDK.

See also

stream, queue

Author

Simon Garnier, garnier@njit.edu

Examples

if (FALSE) { # \dontrun{
live <- stream(0)
release(live)
} # }