cv::gapi::streaming Namespace Reference

This namespace contains G-API functions, structures, and symbols related to the Streaming execution mode. More...

Namespaces
	detail
	meta_tag

Classes
struct	queue_capacity
	Specify queue capacity for streaming execution. More...

Enumerations
enum	sync_policy {   sync_policy::dont_sync,   sync_policy::drop }

Functions
cv::GMat	BGR (const cv::GFrame &in)
	Gets bgr plane from input frame. More...
GMat	desync (const GMat &g)
	Starts a desynchronized branch in the graph. More...
GFrame	desync (const GFrame &f)
	G_API_OP (GY,< GMat(GFrame)>, "org.opencv.streaming.Y")
	G_API_OP (GUV,< GMat(GFrame)>, "org.opencv.streaming.UV")
	G_TYPED_KERNEL (GSize,< GOpaque< Size >(GMat)>, "org.opencv.streaming.size")
	G_TYPED_KERNEL (GSizeR,< GOpaque< Size >(GOpaque< Rect >)>, "org.opencv.streaming.sizeR")
	G_TYPED_KERNEL (GSizeMF,< GOpaque< Size >(GFrame)>, "org.opencv.streaming.sizeMF")
cv::gapi::GKernelPackage	kernels ()
	Create a kernel package object containing kernels and transformations specified in variadic template argument. More...
template<typename T , typename G >
cv::GOpaque< T >	meta (G g, const std::string &tag)
template<typename G >
cv::GOpaque< int64_t >	seq_id (G g)
template<typename G >
cv::GOpaque< int64_t >	seqNo (G g)
GOpaque< Size >	size (const GMat &src)
	Gets dimensions from Mat. More...
GOpaque< Size >	size (const GOpaque< Rect > &r)
GOpaque< Size >	size (const GFrame &src)
	Gets dimensions from MediaFrame. More...
template<typename G >
cv::GOpaque< int64_t >	timestamp (G g)
GMat	UV (const cv::GFrame &frame)
	Extracts UV plane from media frame. More...
GMat	Y (const cv::GFrame &frame)
	Extracts Y plane from media frame. More...

Detailed Description

This namespace contains G-API functions, structures, and symbols related to the Streaming execution mode.

Some of the operations defined in this namespace (e.g. size(), BGR(), etc.) can be used in the traditional execution mode too.

Enumeration Type Documentation

sync_policy

enum cv::gapi::streaming::sync_policy

strong

Enumerator
dont_sync
drop

Function Documentation

BGR()

cv::GMat cv::gapi::streaming::BGR

(

const cv::GFrame &

in

)

Gets bgr plane from input frame.

Note

Function textual ID is "org.opencv.streaming.BGR"

Parameters

in	Input frame

Returns

Image in BGR format

desync() [1/2]

GMat cv::gapi::streaming::desync

(

const GMat &

g

)

Python:
	cv.gapi.streaming.desync(	g	) ->	retval

Starts a desynchronized branch in the graph.

This operation takes a single G-API data object and returns a graph-level "duplicate" of this object.

Operations which use this data object can be desynchronized from the rest of the graph.

This operation has no effect when a GComputation is compiled with regular cv::GComputation::compile(), since cv::GCompiled objects always produce their full output vectors.

This operation only makes sense when a GComputation is compiled in straming mode with cv::GComputation::compileStreaming(). If this operation is used and there are desynchronized outputs, the user should use a special version of cv::GStreamingCompiled::pull() which produces an array of cv::util::optional<> objects.

Note

This feature is highly experimental now and is currently limited to a single GMat/GFrame argument only.

desync() [2/2]

GFrame cv::gapi::streaming::desync

(

const GFrame &

f

)

Python:
	cv.gapi.streaming.desync(	g	) ->	retval

G_API_OP() [1/2]

cv::gapi::streaming::G_API_OP	(	GY	,
		< GMat(GFrame)>	,
		"org.opencv.streaming.Y"
	)

G_API_OP() [2/2]

cv::gapi::streaming::G_API_OP	(	GUV	,
		< GMat(GFrame)>	,
		"org.opencv.streaming.UV"
	)

G_TYPED_KERNEL() [1/3]

cv::gapi::streaming::G_TYPED_KERNEL	(	GSize	,
		< GOpaque< Size >(GMat)>	,
		"org.opencv.streaming.size"
	)

G_TYPED_KERNEL() [2/3]

cv::gapi::streaming::G_TYPED_KERNEL	(	GSizeR	,
		< GOpaque< Size >(GOpaque< Rect >)>	,
		"org.opencv.streaming.sizeR"
	)

G_TYPED_KERNEL() [3/3]

cv::gapi::streaming::G_TYPED_KERNEL	(	GSizeMF	,
		< GOpaque< Size >(GFrame)>	,
		"org.opencv.streaming.sizeMF"
	)

meta()

template<typename T , typename G >

cv::GOpaque<T> cv::gapi::streaming::meta	(	G	g,
		const std::string &	tag
	)

seq_id()

template<typename G >

cv::GOpaque<int64_t> cv::gapi::streaming::seq_id

(

G

g

)

Python:
	cv.gapi.streaming.seq_id(	arg1	) ->	retval

seqNo()

template<typename G >

cv::GOpaque<int64_t> cv::gapi::streaming::seqNo

(

G

g

)

Python:
	cv.gapi.streaming.seqNo(	arg1	) ->	retval

size() [1/3]

GOpaque<Size> cv::gapi::streaming::size

(

const GMat &

src

)

Python:
	cv.gapi.streaming.size(	src	) ->	retval
	cv.gapi.streaming.size(	r	) ->	retval

Gets dimensions from Mat.

Note

Function textual ID is "org.opencv.streaming.size"

Parameters

src	Input tensor

Returns

Size (tensor dimensions).

Examples:

fld_lines.cpp, samples/cpp/lkdemo.cpp, samples/cpp/stitching_detailed.cpp, samples/cpp/train_HOG.cpp, and samples/tapi/squares.cpp.

size() [2/3]

GOpaque<Size> cv::gapi::streaming::size

(

const GOpaque< Rect > &

r

)

Python:
	cv.gapi.streaming.size(	src	) ->	retval
	cv.gapi.streaming.size(	r	) ->	retval

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Gets dimensions from rectangle.

Note

Function textual ID is "org.opencv.streaming.sizeR"

Parameters

r	Input rectangle.

Returns

Size (rectangle dimensions).

size() [3/3]

GOpaque<Size> cv::gapi::streaming::size

(

const GFrame &

src

)

Python:
	cv.gapi.streaming.size(	src	) ->	retval
	cv.gapi.streaming.size(	r	) ->	retval

Gets dimensions from MediaFrame.

Note

Function textual ID is "org.opencv.streaming.sizeMF"

Parameters

src	Input frame

Returns

Size (frame dimensions).

timestamp()

template<typename G >

cv::GOpaque<int64_t> cv::gapi::streaming::timestamp

(

G

g

)

Python:
	cv.gapi.streaming.timestamp(	arg1	) ->	retval

UV()

GMat cv::gapi::streaming::UV

(

const cv::GFrame &

frame

)

Extracts UV plane from media frame.

Output image is 8-bit 2-channel image of CV_8UC2.

Note

Function textual ID is "org.opencv.streaming.UV"

Parameters

frame

input media frame.

Y()

GMat cv::gapi::streaming::Y

(

const cv::GFrame &

frame

)

Extracts Y plane from media frame.

Output image is 8-bit 1-channel image of CV_8UC1.

Note

Function textual ID is "org.opencv.streaming.Y"

Parameters

frame

input media frame.