L_GetObjectInfo

#include "l_bitmap.h"

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

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

L_UINT *puX;

/* pointer to a variable to be updated */

L_UINT *puY;

/* pointer to a variable to be updated */

L_INT *pnAngle;

/* pointer to a variable to be updated */

L_UINT *puRoundness;

/* pointer to a variable to be updated */

L_BOOL bWeighted;

/* flag */

L_UINT32 uFlags;

/* flags */

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

Parameter

Description

pBitmap

Pointer to the bitmap handle.

puX

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

puY

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

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.

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.

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.

uFlags

Reserved for future use. Must be 0.

Returns

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.

See Also

Functions:

L_AddShadowBitmap, L_AllocFTArray, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_DFTBitmap, L_DirectionEdgeStatisticalBitmap, L_FFTBitmap, L_FreeFTArray, L_FrqFilterBitmap, L_FrqFilterMaskBitmap, L_FTDisplayBitmap, L_GetBitmapStatisticsInfo, L_GetFeretsDiameter, L_GetRgnContourPoints, L_GetRgnPerimeterLength, L_MathFunctionBitmap, L_RevEffectBitmap, L_SegmentBitmap, L_SubtractBackgroundBitmap, L_UserFilterBitmap

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. 

#if defined (LEADTOOLS_V16_OR_LATER)
 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;
}
#else
 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);
   if(nRet !=SUCCESS)
      return nRet;
   //free Bitmap
   if(LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}
#endif // LEADTOOLS_V16_OR_LATER