Hi. Last I checked you had to purchase the professional Eztwain32 version in order to get the autocrop functions. I have some home-grown code that seems to be working, but I haven't test it well enough. Maybe you can test it, fix or enhance it and return the improvements?
The code below uses Tscan32 from Rafa. It scans and optionally auto-crops the image. It works well to scan a driver's license. Please send me back any fixes.
//------------------------------------------------------------------------------
FUNCTION scanning_x( oBmp, lAutoCrop, cFileOrg )
LOCAL cFileDes := temp_name( "jpg" )
LOCAL oScan
LOCAL lResult := .F.
LOCAL aCoor
DEFAULT cFileOrg := temp_name( "jpg" )
DEFAULT lAutoCrop := .T.
TRY
oScan := TScan32():New( cFileOrg )
IF !oScan:lError
oScan:SetHide( lAutoCrop )
oScan:Acquire()
oScan:DibToJpeg( cFileOrg )
IF lAutoCrop .and. !EMPTY( oScan:hDib )
aCoor := getCropArea( cFileOrg ) //nTop, nBottom, nLeft, nRight
IF aCoor[1] = aCoor[3]
lResult := .F.
ELSE
cropImage( cFileOrg, aCoor[3], aCoor[1], aCoor[4], aCoor[2], cFileDes )
oBmp:LoadBmp( cFileDes )
oBmp:Refresh()
lResult := .T.
ENDIF
ELSEIF !EMPTY( oScan:hDib )
oBmp:LoadBmp( cFileOrg )
oBmp:Refresh()
lResult := .T.
ENDIF
ENDIF
CATCH
MsgStop( "Scanner not responding" )
cFileDes := ""
lResult := .F.
FINALLY
oScan:End()
END
RETURN iif( lResult, cFileDes, "" )
//------------------------------------------------------------------------------
FUNCTION getCropArea( cNameIn )
LOCAL hBmp := FiLoadImg( cNameIn ) //oImage:hBitmap
LOCAL hDc := GetDc(hBmp)
local hDCMem := CreateCompatibleDC( hDC )
local hOldBmp:= SelectObject( hDCMem, hBmp )
local nX := nBmpWidth( hBmp ) //oImage:nWidth
local nY := nBmpHeight( hBmp ) //oImage:nHeight
local x, y, p, n
local nTop, nLeft, nRight, nBottom
local maxX := 10 //nX / 10 // 10%
local maxY := 10 //nY / 10 // 10%
local nBlank
local nStep := 5
nBlank := getBackGround( hDcMem, nX, nY )
// TOP
y := 20 //0
DO WHILE y <= nY - 1
n := 0
FOR x := 0 TO nX - 10 STEP nStep
p := GetPixel(hDcMem, x, y)
IF( p < nBlank, n++, )
NEXT
IF n > maxX
nTop := y
y := nY
ENDIF
y++
ENDDO
IF y = nY
MSGALERT( 'No information' )
RETURN {0,0,0,0}
ENDIF
// BOTTOM
y := nY - 20 //nY - 1
DO WHILE y >= 0
n := 0
FOR x := 0 TO nX - 10 STEP nStep
p := GetPixel(hDcMem, x, y)
IF( p < nBlank, n++, )
NEXT
IF n > maxX
nBottom := y
y := 0
ENDIF
y--
ENDDO
// LEFT
x := 20 //0
DO WHILE x <= nX - 1
n := 0
FOR y := 0 TO nY - 10 STEP nStep
p := GetPixel(hDcMem, x, y)
IF( p < nBlank, n++, )
NEXT
IF n > maxY
nLeft := x
x := nX
ENDIF
x++
ENDDO
// RIGHT
x := nX - 10 //nX - 1
DO WHILE x >= 0
n := 0
FOR y := 0 TO nY - 10 STEP nStep
p := GetPixel(hDcMem, x, y)
IF( p < nBlank, n++, )
NEXT
IF n > maxY
nRight := x
x := 0
ENDIF
x--
ENDDO
/*
oImage:line( nTop, nLeft, nTop, nRight )
oImage:line( nTop, nRight, nBottom, nRight )
oImage:line( nBottom, nRight, nBottom, nLeft )
oImage:line( nBottom, nLeft, nTop, nLeft )
*/
SelectObject( hDCMem, hOldBmp )
DeleteDC( hDCMem )
return { nTop - 10 , nBottom + 10, nLeft - 10, nRight + 10 }
// Finds background color to be compared with scanning area
//------------------------------------------------------------------------------
STATIC FUNCTION getBackGround( hDcMem, nX, nY )
LOCAL x,y,n, al := {} , nStep := 4
n := 0
FOR y := 20 TO nY -20 STEP nStep
n += GetPixel(hDcMem, 20, y)
NEXT
AADD( al, INT(n / ( nY / nStep ) ) )
n := 0
FOR y := 20 TO nY -20 STEP nStep
n += GetPixel(hDcMem, nX-20, y)
NEXT
AADD(al, INT(n / ( nY / nStep ) ) )
n := 0
FOR x := 20 TO nX -20 STEP nStep
n += GetPixel(hDcMem, x, 20)
NEXT
AADD( al, INT(n / ( nX / nSTep ) ) )
n := 0
FOR x := 20 TO nX -20 STEP nStep
n += GetPixel(hDcMem, x, nY-20)
NEXT
AADD( al, INT(n / ( nX / nStep ) ) )
al := ASORT( al )
RETURN INT( al[4] * .95 )
FUNCTION cropImage( cSrcFile, nLeft, nTop, nRight, nBottom ,cDstFile )
hLib = LOADLIB32( "freeimage.dll" )
//nSrcFormat = FIGETFILETYPE( cSrcFile, 0 )
//hDib = FILOAD( nSrcFormat, cSrcFile, )
//hDib2 = FICOPY( hDib, nLeft, nTop, nRight, nBottom )
//FISAVE( nSrcFormat, hDib2, cDstFile, 0 )
FI_JPGCROP( cSrcFile, cDstFile, nLeft, nTop, nRight, nBottom )
FREELIBRARY( hLib )
return Nil
DLL32 STATIC FUNCTION FICOPY( hDib AS LONG, nLeft AS LONG, nTop AS LONG,nRight AS LONG,nBottom AS LONG ) AS LONG;
PASCAL FROM "_FreeImage_Copy@20" LIB hLib
DLL32 STATIC FUNCTION FISAVE( nFormat AS LONG, hDib AS LONG, cFileName AS LPSTR, nFlags AS LONG ) AS BOOL;
PASCAL FROM "_FreeImage_Save@16" LIB hLib
DLL32 FUNCTION FI_JpgCrop( cSource AS LPSTR, ;
cDest AS LPSTR, ;
nLeft AS LONG, ;
nTop AS LONG, ;
nRight AS LONG, ;
nBottom AS LONG ) AS BOOL ;
PASCAL FROM "_FreeImage_JPEGCrop@24" LIB hLib
DLL32 STATIC FUNCTION FIGETFILETYPE( cFileName AS LPSTR, nSize AS LONG )AS LONG;
PASCAL FROM "_FreeImage_GetFileType@8" LIB hLib
DLL32 STATIC FUNCTION FILOAD( nFormat AS LONG, cFileName AS LPSTR,nFlags AS LONG ) AS LONG;
PASCAL FROM "_FreeImage_Load@12" LIB hLib
Reinaldo.
