LBitmap::AlignImages

#include "ltwrappr.h"

virtual L_INT LBitmap::AlignImages(pTempBitmap, ppOutBitmap, RefPoints, TempPoints, PointsCount, nTransformationMethod)

BITMAPHANDLE* pTempBitmap;

template bitmap to be mapped to the reference bitmap

BITMAPHANDLE** ppOutBitmap;

bitmap containing the result of the registration

L_POINT* RefPoints;

feature points in the reference bitmap to be used for the registration

L_POINT* TempPoints;

feature points in the template bitmap to be used for the registration

L_INT PointsCount;

number of registration points

L_UINT nTransformationMethod;

transformation method flag

Aligns two images (the pRefBitmap and pTempBitmap) based on the locations of the input points. The images are combined, creating the ppOutBitmap.

Parameter Description
pTempBitmap Pointer to a bitmap handle that represents the template bitmap to be mapped to the reference bitmap.
ppOutBitmap Pointer of pointer to a bitmap handle to be updated with the result of the registration.
RefPoints Pointer to variable that contains the feature points in the reference bitmap to be used for the registration process.
TempPoints Pointer to variable that contains the feature points in the template bitmap to be used for the registration process.
PointsCount Number of registration points.
nTransformationMethod Flag that determines which transformation method to use during registration. Possible values are:
Value Meaning
IMAGE_REGISTRATION_UNKNOWN Unknown transformation type. The transformation algorithm will be selected automatically.
IMAGE_REGISTRATION_XY Performs XY translation using one pair of corresponding points during registration.
IMAGE_REGISTRATION_RSXY Performs rotational, scaling and XY transformations using two pairs of corresponding points during registration.
IMAGE_REGISTRATION_AFFINE6 Performs rotational, scaling, shearing, and XY transformations using three pairs of corresponding points during registration.
IMAGE_REGISTRATION_AFFINE8 Performs perspective transformation using four pairs of corresponding points during registration.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

The pTempBitmap should have the same depth (i.e. Bits Per Pixel) as the class bitmap.

For best results, choose points that are far apart from each other.

The transformation performed depends upon the number of pairs of corresponding points given. As many as four pairs can be given.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images.

This function can only process entire images. It does not support regions.

This function supports signed/unsigned images.

Required DLLs and Libraries

LTDIS
LTFIL
LTIMGCOR

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:

LBitmap::PerspectiveDeskew, LBitmap::Keystone, LBitmap::Deskew, Class Members

Example

#if defined (LEADTOOLS_V19_OR_LATER) 
L_INT LBitmap__AlignImagesExample(L_VOID) 
{ 
    L_INT nRet; 
    LBitmap LeadBitmap; 
 
    nRet =LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("cannon.jpg")), 0,ORDER_BGR); 
    if(nRet !=SUCCESS) 
        return nRet ; 
 
    /* Load and rotate Template image to be registered*/ 
    BITMAPHANDLE TemplateImage ; 
    pBITMAPHANDLE pTemplateImage = &TemplateImage ; 
    nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("cannon.jpg")), pTemplateImage, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
    if(nRet !=SUCCESS) 
        return nRet ; 
 
    nRet = L_RotateBitmap( pTemplateImage, 4500, ROTATE_BICUBIC, 0); 
    if(nRet != SUCCESS) 
    { 
        if(pTemplateImage->Flags.Allocated) 
            L_FreeBitmap(pTemplateImage); 
 
        return nRet ; 
    } 
 
    //Set feature points from the two images that correspond to each other. 
    L_POINT RefPoints[2] ; 
    L_POINT TempPoints[2] ; 
 
    RefPoints[0].x = 173 ; RefPoints[0].y = 102 ; 
    RefPoints[1].x = 216 ; RefPoints[1].y = 259 ; 
 
    TempPoints[0].x = 239 ; TempPoints[0].y = 66  ; 
    TempPoints[1].x = 158 ; TempPoints[1].y = 207 ; 
 
    pBITMAPHANDLE pOutBitmap = NULL ; 
 
    nRet = LeadBitmap.AlignImages( pTemplateImage, 
                                   &pOutBitmap, 
                                   RefPoints, 
                                   TempPoints, 
                                   2, 
                                   IMAGE_REGISTRATION_UNKNOWN ) ; 
 
    //free bitmaps 
    if(pTemplateImage->Flags.Allocated) 
        L_FreeBitmap(pTemplateImage); 
 
    if(pOutBitmap->Flags.Allocated) 
        L_FreeBitmap(pOutBitmap); 
 
    return nRet; 
} 
#endif // LEADTOOLS_V19_OR_LATER 
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