MedgeAlloc

Board	Supported
Host System	Yes
V4L2	Yes
Clarity UHD	Yes
Concord PoE	No
GenTL	Yes
GevIQ	Yes
GigE Vision	Yes
Indio	No
Iris GTX	Yes
Radient eV-CL	Yes
Rapixo CL	Yes
Rapixo CoF	Yes
Rapixo CXP	Yes
USB3 Vision	Yes

Allocate an Edge Finder context.

Syntax

AIL_ID MedgeAlloc(
    AIL_ID    SysId,           //in
    AIL_INT64 EdgeFinderType,  //in
    AIL_INT64 ControlFlag,     //in
    AIL_ID *  ContextIdPtr     //out
)

Description

This function allocates an Edge Finder context on the specified system. An Edge Finder context contains all the information necessary to perform an MedgeCalculate operation, including global processing settings, and edge features to calculate.

Edge Finder context settings can be adjusted using MedgeControl.

When the Edge Finder context is no longer required, release it usingMedgeFreeunless M_UNIQUE_ID was specified during allocation; if M_UNIQUE_ID was specified, the smart identifier manages the Edge Finder context's lifetime and you must not manually free it.

Parameters

SysId (in, AIL_ID)

Specifies the system on which to allocate the Edge Finder context.

For specifying the system

Value	Description
M_DEFAULT_HOST	Specifies the default Host system of the current Aurora Imaging Library application.
System identifier	Specifies a valid system identifier, previously allocated using MsysAlloc.

EdgeFinderType (in, AIL_INT64)

Specifies the type of Edge Finder context. This parameter must be set to one of the values below.

For the Edge Finder context

Value	Description
M_CONTOUR	Specifies a contour context type, which is used to find object contours in images.
M_CREST	Specifies a crest context type, which is used to find thin line crests in images.

ControlFlag (in, AIL_INT64)

Reserved for future expansion and must be set to M_DEFAULT.

ContextIdPtr *(out, AIL_ID)

Specifies the address of the variable in which to write the Edge Finder context identifier or specifies the data type that the function should use to return the Edge Finder context identifier.

For retrieving the identifier or specifying how to return it

Value	Description
M_NULL	Specifies that you will use this function's return value to obtain the identifier of the allocated Edge Finder context; in this case, a standard Aurora Imaging Library identifier of type AIL_ID is returned.
M_UNIQUE_ID	Specifies that you will use this function's return value to obtain the identifier of the allocated Edge Finder context; in this case, an Aurora Imaging Library smart identifier of type _AIL_UNIQUE_EDGE_ID_is returned instead of a standard Aurora Imaging Library identifier.This setting is only available when using C++11 (or later).An Aurora Imaging Library smart identifier manages the lifespan of the Aurora Imaging Library object it owns (similar to a std::unique_ptr). Note, you can use an Aurora Imaging Library smart identifier as though it were a standard Aurora Imaging Library identifier, except that you cannot use it to manually free the Edge Finder context (it is freed automatically). For more information, see Aurora Imaging Library smart identifiers.
Address in which to write the contour Edge Finder context identifier	Specifies the address of an AIL_ID in which to write the identifier of the allocated contour Edge Finder context.

If allocation fails, M_NULL is written as the identifier. | | Address in which to write the crest Edge Finder context identifier | Specifies the address of an AIL_ID in which to write the identifier of the allocated crest Edge Finder context.

If allocation fails, M_NULL is written as the identifier. |

Return Value

Type: AIL_ID

The returned value is the Edge Finder context identifier either as a standard identifier (AIL_ID) or a smart identifier (AIL_UNIQUE_EDGE_ID). If allocation fails, M_NULL is returned (or nullptr ifM_UNIQUE_ID was specified).