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L_GetObjectInfo

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_GetObjectInfo (pBitmap, puX, puY, pnAngle, puRoundness, bWeighted, uFlags)

Determines the position, orientation and roundness of the object in the image.

Parameters

L_UINT *puX

Address of a variable to be updated with the x coordinate (in pixels) of the object's center of mass.

L_UINT *puY

Address of a variable to be updated with the y coordinate (in pixels) of the object's center of mass.

L_INT *pnAngle

Address of a variable to be updated with the orientation angle of the objects axis. Valid values are in degrees from 180.00 to 180.00, with negative values produced from clockwise rotation and where 0 is the horizon.

L_UINT *puRoundness

Address of a variable to be updated with the objects roundness (compactness). This ratio will be 0 for a line and 100 for a circle.

L_BOOL bWeighted

Flag that indicates the weighting factor. Possible values are:

Value	Meaning
TRUE	The pixel intensity value (color) will be used as a weighting factor.
FALSE	All non-zero pixels will have the same weight.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

All the objects in the image are considered to be a single object. This function determines various attributes of the object in the image to identify the objects and to determine their position and orientation. If you do not need certain values pass NULL instead.

The results puX, puY and pnAngle obtained by this function are multiplied by 100 in order to obtain more precision. To get the actual results, divide by 100.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGEFX
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

Functions

Topics

Raster Image Functions: Analysis Image Object or Region Analysis

Example

This example will get the object's center of mass and it’s roundness.

L_INT GetObjectInfoExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
   L_UINT   uX, uY, uRound;  
   /* Load a bitmap at its own bits per pixel */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);  
   if(nRet !=SUCCESS) 
      return nRet; 
   /* Get the objects center of mass and it’s roundness. I am not interested in the axis’ orientation, so I pass NULL… */ 
   nRet = L_GetObjectInfo (&LeadBitmap, &uX, &uY, NULL, &uRound, FALSE, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free Bitmap 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap); 
   return SUCCESS; 
}