image compare 99% identical

Alexxander · February 9, 2014

hi all

can i compare 2 images without being 100% identical ?

i have taken this 2 pic from my laptop without moving it (with 2 seconds delay between the 2 pics)

if u focused in them you will find that they are not 100 identical (i don't know whey)

i used an image compare script i found it here

#include <GDIPlus.au3>

_GDIPlus_Startup()
$fname1=FileOpenDialog("First image","","All images(*.bmp;*.jpg;*.png;)")
If $fname1="" Then Exit
$fname2=FileOpenDialog("Second image image","","All images(*.bmp;*.jpg;*.png;)")
If $fname2="" Then Exit
$bm1 = _GDIPlus_ImageLoadFromFile($fname1)
$bm2 = _GDIPlus_ImageLoadFromFile($fname2)

MsgBox(0, "bm1==bm2", CompareBitmaps($bm1, $bm2))
_GDIPlus_ImageDispose($bm1)
_GDIPlus_ImageDispose($bm2)
_GDIPlus_Shutdown()

Func CompareBitmaps($bm1, $bm2)

    $Bm1W = _GDIPlus_ImageGetWidth($bm1)
    $Bm1H = _GDIPlus_ImageGetHeight($bm1)
    $BitmapData1 = _GDIPlus_BitmapLockBits($bm1, 0, 0, $Bm1W, $Bm1H, $GDIP_ILMREAD, $GDIP_PXF32RGB)
    $Stride = DllStructGetData($BitmapData1, "Stride")
    $Scan0 = DllStructGetData($BitmapData1, "Scan0")

    $ptr1 = $Scan0
    $size1 = ($Bm1H - 1) * $Stride + ($Bm1W - 1) * 4


    $Bm2W = _GDIPlus_ImageGetWidth($bm2)
    $Bm2H = _GDIPlus_ImageGetHeight($bm2)
    $BitmapData2 = _GDIPlus_BitmapLockBits($bm2, 0, 0, $Bm2W, $Bm2H, $GDIP_ILMREAD, $GDIP_PXF32RGB)
    $Stride = DllStructGetData($BitmapData2, "Stride")
    $Scan0 = DllStructGetData($BitmapData2, "Scan0")

    $ptr2 = $Scan0
    $size2 = ($Bm2H - 1) * $Stride + ($Bm2W - 1) * 4

    $smallest = $size1
    If $size2 < $smallest Then $smallest = $size2
    $call = DllCall("msvcrt.dll", "int:cdecl", "memcmp", "ptr", $ptr1, "ptr", $ptr2, "int", $smallest)



    _GDIPlus_BitmapUnlockBits($bm1, $BitmapData1)
    _GDIPlus_BitmapUnlockBits($bm2, $BitmapData2)

    Return ($call[0]=0)


EndFunc  ;==>CompareBitmaps

im getting false (which means they are not identical)

is their is a way to compare 2 images with ignoring this very tiny difference ?

or maybe i can chose how much % identical the compare is ?

this is the udf i used to take the pics

#include-once
;#include <GUIConstants.au3>
#include <WindowsConstants.au3>
#include <GDIPlus.au3>
#include <Date.au3>

;~ #####################################################
;~ ###           ###
;~ ###   Webcam UDF   ###
;~ ###           ###
;~ ### Functions : _WebcamInit()      ###
;~ ###    _Webcam()    ###
;~ ###    _WebcamStop()   ###
;~ ###    _WebcamSnapShot()  ###
;~ ###           ###
;~ ###       Made by L|M|TER     ###
;~ ### --------------------------------------------- ###
;~ ###           ###
;~ ###    Copyright ?008 - L|M|TER    ###
;~ ###           ###
;~ #####################################################
;~ Declaring Variables
$WM_CAP_START = 0x400
$WM_CAP_UNICODE_START = $WM_CAP_START + 100
$WM_CAP_PAL_SAVEA = $WM_CAP_START + 81
$WM_CAP_PAL_SAVEW = $WM_CAP_UNICODE_START + 81
$WM_CAP_UNICODE_END = $WM_CAP_PAL_SAVEW
$WM_CAP_ABORT = $WM_CAP_START + 69
$WM_CAP_DLG_VIDEOCOMPRESSION = $WM_CAP_START + 46
$WM_CAP_DLG_VIDEODISPLAY = $WM_CAP_START + 43
$WM_CAP_DLG_VIDEOFORMAT = $WM_CAP_START + 41
$WM_CAP_DLG_VIDEOSOURCE = $WM_CAP_START + 42
$WM_CAP_DRIVER_CONNECT = $WM_CAP_START + 10
$WM_CAP_DRIVER_DISCONNECT = $WM_CAP_START + 11
$WM_CAP_DRIVER_GET_CAPS = $WM_CAP_START + 14
$WM_CAP_DRIVER_GET_NAMEA = $WM_CAP_START + 12
$WM_CAP_DRIVER_GET_NAMEW = $WM_CAP_UNICODE_START + 12
$WM_CAP_DRIVER_GET_VERSIONA = $WM_CAP_START + 13
$WM_CAP_DRIVER_GET_VERSIONW = $WM_CAP_UNICODE_START + 13
$WM_CAP_EDIT_COPY = $WM_CAP_START + 30
$WM_CAP_END = $WM_CAP_UNICODE_END
$WM_CAP_FILE_ALLOCATE = $WM_CAP_START + 22
$WM_CAP_FILE_GET_CAPTURE_FILEA = $WM_CAP_START + 21
$WM_CAP_FILE_GET_CAPTURE_FILEW = $WM_CAP_UNICODE_START + 21
$WM_CAP_FILE_SAVEASA = $WM_CAP_START + 23
$WM_CAP_FILE_SAVEASW = $WM_CAP_UNICODE_START + 23
$WM_CAP_FILE_SAVEDIBA = $WM_CAP_START + 25
$WM_CAP_FILE_SAVEDIBW = $WM_CAP_UNICODE_START + 25
$WM_CAP_FILE_SET_CAPTURE_FILEA = $WM_CAP_START + 20
$WM_CAP_FILE_SET_CAPTURE_FILEW = $WM_CAP_UNICODE_START + 20
$WM_CAP_FILE_SET_INFOCHUNK = $WM_CAP_START + 24
$WM_CAP_GET_AUDIOFORMAT = $WM_CAP_START + 36
$WM_CAP_GET_CAPSTREAMPTR = $WM_CAP_START + 1
$WM_CAP_GET_MCI_DEVICEA = $WM_CAP_START + 67
$WM_CAP_GET_MCI_DEVICEW = $WM_CAP_UNICODE_START + 67
$WM_CAP_GET_SEQUENCE_SETUP = $WM_CAP_START + 65
$WM_CAP_GET_STATUS = $WM_CAP_START + 54
$WM_CAP_GET_USER_DATA = $WM_CAP_START + 8
$WM_CAP_GET_VIDEOFORMAT = $WM_CAP_START + 44
$WM_CAP_GRAB_FRAME = $WM_CAP_START + 60
$WM_CAP_GRAB_FRAME_NOSTOP = $WM_CAP_START + 61
$WM_CAP_PAL_AUTOCREATE = $WM_CAP_START + 83
$WM_CAP_PAL_MANUALCREATE = $WM_CAP_START + 84
$WM_CAP_PAL_OPENA = $WM_CAP_START + 80
$WM_CAP_PAL_OPENW = $WM_CAP_UNICODE_START + 80
$WM_CAP_PAL_PASTE = $WM_CAP_START + 82
$WM_CAP_SEQUENCE = $WM_CAP_START + 62
$WM_CAP_SEQUENCE_NOFILE = $WM_CAP_START + 63
$WM_CAP_SET_AUDIOFORMAT = $WM_CAP_START + 35
$WM_CAP_SET_CALLBACK_CAPCONTROL = $WM_CAP_START + 85
$WM_CAP_SET_CALLBACK_ERRORA = $WM_CAP_START + 2
$WM_CAP_SET_CALLBACK_ERRORW = $WM_CAP_UNICODE_START + 2
$WM_CAP_SET_CALLBACK_FRAME = $WM_CAP_START + 5
$WM_CAP_SET_CALLBACK_STATUSA = $WM_CAP_START + 3
$WM_CAP_SET_CALLBACK_STATUSW = $WM_CAP_UNICODE_START + 3
$WM_CAP_SET_CALLBACK_VIDEOSTREAM = $WM_CAP_START + 6
$WM_CAP_SET_CALLBACK_WAVESTREAM = $WM_CAP_START + 7
$WM_CAP_SET_CALLBACK_YIELD = $WM_CAP_START + 4
$WM_CAP_SET_MCI_DEVICEA = $WM_CAP_START + 66
$WM_CAP_SET_MCI_DEVICEW = $WM_CAP_UNICODE_START + 66
$WM_CAP_SET_OVERLAY = $WM_CAP_START + 51
$WM_CAP_SET_PREVIEW = $WM_CAP_START + 50
$WM_CAP_SET_PREVIEWRATE = $WM_CAP_START + 52
$WM_CAP_SET_SCALE = $WM_CAP_START + 53
$WM_CAP_SET_SCROLL = $WM_CAP_START + 55
$WM_CAP_SET_SEQUENCE_SETUP = $WM_CAP_START + 64
$WM_CAP_SET_USER_DATA = $WM_CAP_START + 9
$WM_CAP_SET_VIDEOFORMAT = $WM_CAP_START + 45
$WM_CAP_SINGLE_FRAME = $WM_CAP_START + 72
$WM_CAP_SINGLE_FRAME_CLOSE = $WM_CAP_START + 71
$WM_CAP_SINGLE_FRAME_OPEN = $WM_CAP_START + 70
$WM_CAP_STOP = $WM_CAP_START + 68
$cap = ""
$avi = ""
$user = ""
$snapfile = @ScriptDir & "\snapshot.bmp"
;~ ##########################################################
;~ Function Name : _WebcamInit()
;~ Description : Starts the webcam image capturing session
;~ Author : L|M|TER
;~ ##########################################################
Func _WebcamInit()
$avi = DllOpen("avicap32.dll")
$user = DllOpen("user32.dll")
EndFunc   ;==>_WebcamInit
;~ ##########################################################
;~ Function Name : _Webcam($gui,$h,$w,$l,$t)
;~ Description : Creates a webcam preview window
;~ Parameter(s):
;~  $gui - The gui where the webcam window should be created
;~  $h - The height of the webcam window
;~  $w - The width of the webcam window
;~  $l - The left position of the webcam window
;~  $t - The top position of the webcam window
;~ NOTE : All parameters required !
;~ Author : L|M|TER
;~ ##########################################################
Func _Webcam($gui, $w, $h, $l, $t)
$cap = DllCall($avi, "int", "capCreateCaptureWindow", "str", "cap", "int", BitOR($WS_CHILD, $WS_VISIBLE), "int", $l, "int", $t, "int", $w, "int", $h, "hwnd", $gui, "int", 1)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_DRIVER_CONNECT, "int", 0, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_SET_SCALE, "int", 1, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_SET_OVERLAY, "int", 1, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_SET_PREVIEW, "int", 1, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_SET_PREVIEWRATE, "int", 1, "int", 0)
EndFunc   ;==>_Webcam
;~ ##########################################################
;~ Function Name : _WebcamStop()
;~ Description : Closes the webcam image capturing session
;~ Author : L|M|TER
;~ ##########################################################
Func _WebcamStop()
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_END, "int", 0, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_DRIVER_DISCONNECT, "int", 0, "int", 0)
DllClose($user)
DllClose($avi)
EndFunc   ;==>_WebcamStop
;~ ##########################################################
;~ Function Name : _WebcamSnapShot($file)
;~ Description : Takes a snapshot
;~ Parameter(s):
;~  $file (Optional) - The path to the file where the snapshot will be saved (Default : @ScriptDir & "\snapshot.bmp")
;~ Author : L|M|TER
;~ ##########################################################
Func _WebcamSnapShot($Dest = $snapfile, $AddTimeStamp = false)
$RandomFileName = Random(9000, 99999, 1) & ".bmp"
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_GRAB_FRAME_NOSTOP, "int", 0, "int", 0)
DllCall($user, "int", "SendMessage", "hWnd", $cap[0], "int", $WM_CAP_FILE_SAVEDIBA, "int", 0, "str", $RandomFileName)
_ConvertImage($RandomFileName, $Dest, $AddTimeStamp)
FileDelete($RandomFileName)
EndFunc   ;==>_WebcamSnapShot
Func _ConvertImage($Src, $Dest, $AddTimeStamp = False)
_GDIPlus_Startup()
$hImage = _GDIPlus_ImageLoadFromFile($Src)
If $AddTimeStamp Then
  $hGraphic = _GDIPlus_ImageGetGraphicsContext($hImage)
  $hBrush = _GDIPlus_BrushCreateSolid(0xFFFFFFFF)
  $hFormat = _GDIPlus_StringFormatCreate()
  $hFamily = _GDIPlus_FontFamilyCreate("Arial")
  $hFont = _GDIPlus_FontCreate($hFamily, 16, 1)
  $tLayout = _GDIPlus_RectFCreate(500, 415, 150, 100)
  _GDIPlus_GraphicsDrawStringEx($hGraphic, _NowDate() & @CRLF & _NowTime(), $hFont, $tLayout, $hFormat, $hBrush)
  _GDIPlus_FontDispose($hFont)
  _GDIPlus_FontFamilyDispose($hFamily)
  _GDIPlus_StringFormatDispose($hFormat)
  _GDIPlus_BrushDispose($hBrush)
  _GDIPlus_GraphicsDispose($hGraphic)
EndIf
_GDIPlus_ImageSaveToFile($hImage, $Dest)
_GDIPlus_ImageDispose($hImage)
_GDIPlus_Shutdown()
EndFunc   ;==>_ConvertImage

any ideas to make that script show true ?

Edited February 9, 2014 by Alexxander

Gianni · February 9, 2014

..... :blink: maybe the tiger has moved a bit in the second image....

Alexxander · February 9, 2014

..... maybe the tiger has moved a bit in the second image....

i thought it was dead .. run for ur life's

LOL

JohnOne · February 9, 2014

You will find the answer to why they change, in your other thread.

Somerset · February 9, 2014

Natural light is effected by atmospheric conditions and artificial light(bulbs) is effect by acdc strobing. You moving in the room can effect the light play on objects.

Alexxander · February 9, 2014

You will find the answer to why they change, in your other thread.

Natural light is effected by atmospheric conditions and artificial light(bulbs) is effect by acdc strobing. You moving in the room can effect the light play on objects.

ok now i know why it change how can u ignore the change and get true ?

Somerset · February 9, 2014

i have always liked this.

http://www.imagemagick.org/script/compare.php

Alexxander · February 9, 2014

i have found this

http://phash.org/demo/

it is awesome it gaved me that the 2 images are 0.99 identical

i had downloaded it bit i have no idea how to deal with its api

he wrotes in his site

"provides a C-like API to use those functions in your own programs. pHash itself is written in C++."

any 1 can help me check images with autoit through this api ?

nullschritt · February 10, 2014

Look at both of my recommendations in this thread. '?do=embed' frameborder='0' data-embedContent>>

The first idea could isolate which pixels changed, and what percent of pixels is different.

The second idea could isolate which pixels changed, and by how much. If you need help I can maybe write a short script later as an example?

nullschritt · February 10, 2014

If you can get the pixels here's a script to compare them.

I wrote this up in my spare time, seems to work pretty well.

ConsoleWrite(_colorcompare('ffffff', 'eeeeee')&@CRLF)

func _colorcompare($color1, $color2)
    Local $difference
$color1 = StringSplit($color1, "")
$color2 = StringSplit($color2, "")
$difference = 0
for $i=1 to $color1[0]
if $color1[$i] <> $color2[$i] Then
    $difference += Abs(_hextonum($color1[$i]) - _hextonum($color2[$i]))
EndIf
Next
$difference = (($difference/$color1[0])/15)*100
Return $difference
EndFunc

func _hextonum($info)
if $info+0 > 0 Then Return $info
$info = StringLower($info)
$return = asc($info)-87
switch $return
    Case -39
        Return 0
    Case Else
        Return $return
EndSwitch
EndFunc

Edit: Updated function to support strings of any length. Should be faster to pass the pixels to the function as one big string than through a loop. Edited February 10, 2014 by nullschritt

Somerset · February 10, 2014

Here are the differences.

UEZ · February 10, 2014

Here a script which displays the difference between 2 images:

#include <GDIPlus.au3>
#include <WindowsConstants.au3>

_GDIPlus_Startup()

_WinAPI_BitmapsGetDiff(@ScriptDir & "\Filled.bmp", @ScriptDir & "\Logo4.bmp", @ScriptDir & "\Diff.png") ;change the file names here!

ShellExecute(@ScriptDir & "\Diff.png")

_GDIPlus_Shutdown()


Func _WinAPI_BitmapsGetDiff($sFile1, $sFile2, $sSave, $iROP = $MERGEPAINT) ;coded by UEZ 2014-02-10
    Local Const $hBitmap1 = _GDIPlus_BitmapCreateFromFile($sFile1)
    If @error Then Return SetError(1, 0, 0)
    Local Const $hBitmap2 = _GDIPlus_BitmapCreateFromFile($sFile2)
    If @error Then
        _GDIPlus_BitmapDispose($hBitmap1)
        Return SetError(2, 0, 0)
    EndIf

    Local Const $iW = _GDIPlus_ImageGetWidth($hBitmap1), $iH = _GDIPlus_ImageGetHeight($hBitmap1)
    If _GDIPlus_ImageGetWidth($hBitmap2) <> $iW Or _GDIPlus_ImageGetHeight($hBitmap2) <> $iH Then
        _GDIPlus_BitmapDispose($hBitmap1)
        _GDIPlus_BitmapDispose($hBitmap2)
        Return SetError(3, 0, 0)
    EndIf
    Local Const $hHBitmap1 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD1 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer1 = _WinAPI_CreateCompatibleDC($hD1)
    Local Const $DC_obj1 = _WinAPI_SelectObject($hDC_backbuffer1, $hHBitmap1)
    Local Const $hGraphic1 = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer1)
    _GDIPlus_GraphicsSetInterpolationMode($hGraphic1, 5)
    _GDIPlus_GraphicsDrawImageRect($hGraphic1, $hBitmap1, 0, 0, $iW, $iH)

    Local Const $hHBitmap2 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD2 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer2 = _WinAPI_CreateCompatibleDC($hD2)
    Local Const $DC_obj2 = _WinAPI_SelectObject($hDC_backbuffer2, $hHBitmap2)
    Local Const $hGraphic2 = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer2)
    _GDIPlus_GraphicsSetInterpolationMode($hGraphic2, 5)
    _GDIPlus_GraphicsDrawImageRect($hGraphic2, $hBitmap2, 0, 0, $iW, $iH)

    Local Const $hHBitmap3 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD3 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer3 = _WinAPI_CreateCompatibleDC($hD3)
    Local Const $DC_obj3 = _WinAPI_SelectObject($hDC_backbuffer3, $hHBitmap3)

    _WinAPI_BitBlt($hDC_backbuffer3, 0, 0, $iW, $iH, $hDC_backbuffer1, 0, 0, $SRCCOPY)
    _WinAPI_BitBlt($hDC_backbuffer3, 0, 0, $iW, $iH, $hDC_backbuffer2, 0, 0, $iROP)

    _GDIPlus_BitmapDispose($hBitmap1)
    _GDIPlus_BitmapDispose($hBitmap2)

    $hBitmap3 = _GDIPlus_BitmapCreateFromHBITMAP($hHBitmap3)
    _GDIPlus_ImageSaveToFile($hBitmap3, $sSave)
    _GDIPlus_BitmapDispose($hBitmap3)

    _GDIPlus_GraphicsDispose($hGraphic1)
    _WinAPI_SelectObject($hD1, $DC_obj1)
    _WinAPI_DeleteDC($hDC_backbuffer1)
    _WinAPI_DeleteObject($hHBitmap1)
    _WinAPI_ReleaseDC(0, $hD1)

    _GDIPlus_GraphicsDispose($hGraphic2)
    _WinAPI_SelectObject($hD2, $DC_obj2)
    _WinAPI_DeleteDC($hDC_backbuffer2)
    _WinAPI_DeleteObject($hHBitmap2)
    _WinAPI_ReleaseDC(0, $hD2)

    _WinAPI_SelectObject($hD3, $DC_obj3)
    _WinAPI_DeleteDC($hDC_backbuffer3)
    _WinAPI_DeleteObject($hHBitmap3)
    _WinAPI_ReleaseDC(0, $hD3)
    Return 1
EndFunc

Result:

Edit: visually the images are the same and the question is how to recognize this....

Br,

UEZ

Edited February 10, 2014 by UEZ

junkew · February 10, 2014

'?do=embed' frameborder='0' data-embedContent>>

JohnOne · February 10, 2014

Here a script which displays the difference between 2 images:

Func _WinAPI_BitmapsGetDiff($sFile1, $sFile2, $sSave, $iROP = $MERGEPAINT) ;coded by UEZ 2014-02-10
    Local Const $hBitmap1 = _GDIPlus_BitmapCreateFromFile($sFile1)
    If @error Then Return SetError(1, 0, 0)
    Local Const $hBitmap2 = _GDIPlus_BitmapCreateFromFile($sFile2)
    If @error Then
        _GDIPlus_BitmapDispose($hBitmap1)
        Return SetError(2, 0, 0)
    EndIf

    Local Const $iW = _GDIPlus_ImageGetWidth($hBitmap1), $iH = _GDIPlus_ImageGetHeight($hBitmap1)
    If _GDIPlus_ImageGetWidth($hBitmap2) <> $iW Or _GDIPlus_ImageGetHeight($hBitmap2) <> $iH Then
        _GDIPlus_BitmapDispose($hBitmap1)
        _GDIPlus_BitmapDispose($hBitmap2)
        Return SetError(3, 0, 0)
    EndIf
    Local Const $hHBitmap1 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD1 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer1 = _WinAPI_CreateCompatibleDC($hD1)
    Local Const $DC_obj1 = _WinAPI_SelectObject($hDC_backbuffer1, $hHBitmap1)
    Local Const $hGraphic1 = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer1)
    _GDIPlus_GraphicsSetInterpolationMode($hGraphic1, 5)
    _GDIPlus_GraphicsDrawImageRect($hGraphic1, $hBitmap1, 0, 0, $iW, $iH)

    Local Const $hHBitmap2 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD2 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer2 = _WinAPI_CreateCompatibleDC($hD2)
    Local Const $DC_obj2 = _WinAPI_SelectObject($hDC_backbuffer2, $hHBitmap2)
    Local Const $hGraphic2 = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer2)
    _GDIPlus_GraphicsSetInterpolationMode($hGraphic2, 5)
    _GDIPlus_GraphicsDrawImageRect($hGraphic2, $hBitmap2, 0, 0, $iW, $iH)

    Local Const $hHBitmap3 = _WinAPI_CreateDIB($iW, $iH)
    Local Const $hD3 = _WinAPI_GetWindowDC(0)
    Local Const $hDC_backbuffer3 = _WinAPI_CreateCompatibleDC($hD3)
    Local Const $DC_obj3 = _WinAPI_SelectObject($hDC_backbuffer3, $hHBitmap3)

    _WinAPI_BitBlt($hDC_backbuffer3, 0, 0, $iW, $iH, $hDC_backbuffer1, 0, 0, $SRCCOPY)
    _WinAPI_BitBlt($hDC_backbuffer3, 0, 0, $iW, $iH, $hDC_backbuffer2, 0, 0, $iROP)

    _GDIPlus_BitmapDispose($hBitmap1)
    _GDIPlus_BitmapDispose($hBitmap2)

    $hBitmap3 = _GDIPlus_BitmapCreateFromHBITMAP($hHBitmap3)
    _GDIPlus_ImageSaveToFile($hBitmap3, $sSave)
    _GDIPlus_BitmapDispose($hBitmap3)

    _GDIPlus_GraphicsDispose($hGraphic1)
    _WinAPI_SelectObject($hD1, $DC_obj1)
    _WinAPI_DeleteDC($hDC_backbuffer1)
    _WinAPI_DeleteObject($hHBitmap1)
    _WinAPI_ReleaseDC(0, $hD1)

    _GDIPlus_GraphicsDispose($hGraphic2)
    _WinAPI_SelectObject($hD2, $DC_obj2)
    _WinAPI_DeleteDC($hDC_backbuffer2)
    _WinAPI_DeleteObject($hHBitmap2)
    _WinAPI_ReleaseDC(0, $hD2)

    _WinAPI_SelectObject($hD3, $DC_obj3)
    _WinAPI_DeleteDC($hDC_backbuffer3)
    _WinAPI_DeleteObject($hHBitmap3)
    _WinAPI_ReleaseDC(0, $hD3)
    Return 1
EndFunc

Br,

UEZ

Pretty good that.

100ms for a full screen check for me.

Alexxander · February 10, 2014

thank you so much guys you are awesome

nullschritt · February 10, 2014

@UEZ

"Edit: visually the images are the same and the question is how to recognize this...."

This is what my script I posted above does, sort of.

It can return the actual % of change that occurred overall. So if the image is completely the same visually, but the lighting has changed, there will only be a small % in the difference.

Edit: With modification it can even visually display where the difference occurred and by how much, similar to yours, though I suspect using my method would take twice as long per amount of data, as it has to compare every byte of the color data.

Edited February 10, 2014 by nullschritt

JohnOne · February 10, 2014

Forgive me if I'm wrong, but what you posted is not even close to comparing two images of ~~hundreds of thousands~~ millions of pixels in anywhere near 100 miliseconds.

It's a string compare function or something.

Edited February 10, 2014 by JohnOne

nullschritt · February 11, 2014

Forgive me if I'm wrong, but what you posted is not even close to comparing two images of ~~hundreds of thousands~~ millions of pixels in anywhere near 100 miliseconds.

It's a string compare function or something.

No you dont fully understand what it doess, Firstly it is not a compare function, it is a difference function. is a hex color has changed by a shade, this script detects that different shade. My tool is not basic compare two string get the comparative difference script. My script gets the relative amount of data that has been changed, and by how much.

All I would have to do is make a third image, and populate it with the array containing the differences, and amounts of difference, as represented by shades, simmilar to your result. Please dont assume that I'm ignorant, you my find I am not.

You could look here if you need a better explanations of what exactly my simple and efficient script does. '?do=embed' frameborder='0' data-embedContent>>

7

And as you haven;t run my code, since you obviously dont comprehend what it does, and since you say there's no way it does that that fast. If you would run the script in my incuded link, it has an example comparing two 1000x1000px images in 200 milliseconds. I'm actually going to make a visual version that displays the difference, just because it seems like a cool concept.

ps: Please don't judge a book by it's cover mate.

Edit: though you're right about the speed, it does take around 30 seconds for a 1000x1000 image, my test code wasnt generating all the pixels to be evaluated, still though it's a pretty effective tool.

Edited February 13, 2014 by nullschritt

nullschritt · February 13, 2014

Though I would add that I release an imagecompare library based on my datadifference udf.

My udf was able to detect there was an average of 10.19% difference in your images. (this means it got 10% brighter in the room in these 2 seconds. (probably due to the skylight in your room)

See the below images. The shades of blue represent the amount of change that has occurred. Lighter blue = more change. black= no change.

(this image excludes changes of less than 10%)

(notice how the black areas are either 1)full white/black and thus cannot appear any brighter OR 2)are under objects (shadows))

(image with all changes displayed)

Alexxander · February 13, 2014

nice found bro

but it was at 1 AM at the middle of the night i was using neon lamps to lighten the room

on other difference finder programs the difference was 2 %

but thanks for sharing us your results

image compare 99% identical

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