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Mingre

Detect lines of black text on screen (not OCR)

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Hello forums,

I'd like to know if anyone has better idea than what I have. I'm creating a program that will detect (not OCR!) blocks of words (black text) on a white background displayed on the screen. (If anyone is curious about its purpose, this code will be part of a program that will randomly select a word on a PDF file and have the user guess that word. I'll be using it to quiz myself with my PDF notes. )

What I created so far: Using FastFind.au3, I was able to make it detect lines of black text (font Lucida Console) on a single column. It basically considers a line a separate one if bounded above and below by horizontal lines that do not contain black pixels. Next step, which I haven't done yet, will be to go through each line and detect the blocks of words.

The program works fine so far with Lucida Console font but it doesn't when tested on TNR font (see attached sample image). The former can be tested by setting $iOption to "text" while the latter by setting it to "select".

So does anyone have a better idea on going about this? Thank you!

Sorry if my code's a mess. I tried to make it cleaner before posting it but this is the best I can manage.

#include <FastFind.au3>
#include <array.au3>
HotKeySet('{ESC}', '__Exit')

Local $iImagePos[4], $iXa, $iXb, $iYa, $iYb
$iOption = 'text'
Switch $iOption
  Case 'text'   ; Creates sample text file for detection
    Local Const $sSampleTextFileName = 'sample.txt'
    FileWrite($sSampleTextFileName, '')
    FileOpen($sSampleTextFileName, 2)
    FileWrite($sSampleTextFileName, 'First line.' & @CRLF & 'Second line.' & @CRLF & @CRLF & 'Third line.')
    FileClose($sSampleTextFileName)
    ShellExecute($sSampleTextFileName)
    Local Const $sSampleTextFileTitle = 'sample - Notepad'
    WinWait($sSampleTextFileTitle)
    WinMove($sSampleTextFileTitle, '', 0, 0, @DesktopWidth / 2, @DesktopHeight / 2)
    Sleep(500)
    $iImagePos = __ControlGetPos($sSampleTextFileTitle, '[CLASS:Edit; INSTANCE:1]') ; Gets the absolute coordinates of the edit control.
    Local $iXa = $iImagePos[0], _
        $iXb = $iImagePos[0] + $iImagePos[2], _
        $iYa = $iImagePos[1], _
        $iYb = $iImagePos[1] + $iImagePos[3]
  Case 'select'
    MsgBox(0, 'Select', 'Select first')
    $iXa = MouseGetPos(0)
    $iYa = MouseGetPos(1)
    MsgBox(0, 'Select', 'Select second')
    $iXb = MouseGetPos(0)
    $iYb = MouseGetPos(1)
EndSwitch


Local $array[1][2] ; Will be used for saving coordinates of lines of text
Local $iBlackPixelCount
Local $bHasNoPreviousZero = True ; Will be used as a toggle for skipping succeeding lines that have no black pixels.
Local $iStep = 1
For $y = $iYa To $iYb Step $iStep
  FFSnapShot($iXa, $y, $iXb, $y)
  $iBlackPixelCount = FFColorCount(0x000000, 50, False)
  ; $iBlackPixelPercent = Round(100 * (FFColorCount(0x000000, 0, False) / $iImagePos[2]), 2) ; Computes for percentage of black pixels on horizontal line.
  ; If $iBlackPixelCount > 0 Or $bHasNoPreviousZero Then
  ; $bHasNoPreviousZero = True
  _ArrayAdd($array, $iBlackPixelCount)
  $array[UBound($array) - 1][1] = $y
  ; If $iBlackPixelCount = 0 Then $bHasNoPreviousZero = False
  ; EndIf
Next

; To check detected lines. This will move mouse to the lower-left corner of the text line.
For $i = 0 To UBound($array) - 1 Step +1
  If $array[$i][0] > 0 Then
    If $i + 1 <= UBound($array) - 1 Then
      If $array[$i + 1][0] = 0 Then
        MouseMove($iXa, $array[$i][1])
        Sleep(500)
      EndIf
    EndIf
  ;
  EndIf
Next

_ArrayDisplay($array)

Func __ControlGetPos($hWnd, $controlID, $bAbsolute = Default)
  ;; https://www.autoitscript.com/forum/topic/88345-absolute-position-of-guicontrol/
  If $bAbsolute = Default Then $bAbsolute = True
  Local $controlPos
  Switch $bAbsolute
    Case True
      Local Const $hWnd_Control = ControlGetHandle($hWnd, "", $controlID)
      $controlPos = WinGetPos($hWnd_Control)
    Case False
      $controlPos = ControlGetPos($hWnd, "", $controlID)
  EndSwitch
  If Not IsArray($controlPos) Then SetError(1)
  Return $controlPos
EndFunc   ;==>__ControlGetPos

Func __Exit()
  Exit
EndFunc   ;==>__Exit

 

FastFind.dll

FastFind.au3

FastFind64.dll

sample image.bmp

Edited by Mingre

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Hello instead of checking for black pixels, I changed it to check white pixels and it now works on TNR font. Thanks everyone! :) 

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$__g_iBorder - $__g_iBorder / 2), 0, $__g_iBorder, $__g_iBorder) ControlMove($__g_hGUI_MarkArea, "", $__g_iLabel_LM, 0, ($__g_iH - $__g_iBorder) / 2, $__g_iBorder, $__g_iBorder) ControlMove($__g_hGUI_MarkArea, "", $__g_iLabel_RM, ($__g_iW - $__g_iBorder - $__g_iBorder / 2), ($__g_iH - $__g_iBorder) / 2, $__g_iBorder, $__g_iBorder) ControlMove($__g_hGUI_MarkArea, "", $__g_iLabel_BL, 0, ($__g_iH - $__g_iBorder - $__g_iBorder / 2), $__g_iBorder, $__g_iBorder) ControlMove($__g_hGUI_MarkArea, "", $__g_iLabel_BM, ($__g_iW - $__g_iBorder) / 2, ($__g_iH - $__g_iBorder - $__g_iBorder / 2), $__g_iBorder, $__g_iBorder) ControlMove($__g_hGUI_MarkArea, "", $__g_iLabel_BR, ($__g_iW - $__g_iBorder - $__g_iBorder / 2), ($__g_iH - $__g_iBorder - $__g_iBorder / 2), $__g_iBorder, $__g_iBorder) If $__g_bSelectionDone And $bAnim Then GUIRegisterMsg($WM_TIMER, "PlayBorderAnim") EndFunc ;==>UpdateCtrlPos Func PlayBorderAnim() Local $aWinPos = WinGetClientSize($__g_hGUI_MarkArea), $iW = $aWinPos[0], $iH = $aWinPos[1] Local Static $fOffset = 0 Local Const $iSize = $__g_iBorder / 2 Local Const $hDC = _WinAPI_GetDC($__g_hGUI_MarkArea) Local Const $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC, $iW, $iH) Local Const $hDC_backbuffer = _WinAPI_CreateCompatibleDC($hDC) Local Const $DC_obj = _WinAPI_SelectObject($hDC_backbuffer, $hHBitmap) Local Const $hCanvas = _GDIPlus_GraphicsCreateFromHDC($hDC_backbuffer) Local Const $hPen = _GDIPlus_PenCreate(0xFF0178D7, $iSize), $hPen2 = _GDIPlus_PenCreate(0xFFFFFFFF, $iSize), _ $hBrush = _GDIPlus_BrushCreateSolid(0xFF000000 + $__g_iColor_ResizeDots), $hPen3 = _GDIPlus_PenCreate(0xFF000000) _GDIPlus_PenSetDashStyle($hPen, $GDIP_DASHSTYLEDASHDOT) _GDIPlus_GraphicsClear($hCanvas, 0xFFABCDEF) ;for faster performance direct dll calls DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen2, "float", 1 + $iSize, "float", 1 + $iSize, "float", $iW - 2 * $iSize - 2, "float", $iH - 2 * $iSize - 2) DllCall($__g_hGDIPDll, "int", "GdipSetPenDashOffset", "handle", $hPen, "float", $fOffset) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen, "float", 1 + $iSize, "float", 1 + $iSize, "float", $iW - 2 * $iSize - 2, "float", $iH - 2 * $iSize - 2) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) / 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) / 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", 0, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) / 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", 0, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", 0, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) / 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) / 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipFillRectangle", "handle", $hCanvas, "handle", $hBrush, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) DllCall($__g_hGDIPDll, "int", "GdipDrawRectangle", "handle", $hCanvas, "handle", $hPen3, "float", ($iW - $__g_iBorder) - 2, "float", ($iH - $__g_iBorder) - 2, "float", $__g_iBorder + 1, "float", $__g_iBorder + 1) _WinAPI_BitBlt($hDC, 0, 0, $iW, $iH, $hDC_backbuffer, 0, 0, $SRCCOPY) $fOffset += 0.5 _GDIPlus_GraphicsDispose($hCanvas) _WinAPI_SelectObject($hDC_backbuffer, $DC_obj) _WinAPI_DeleteDC($hDC_backbuffer) _WinAPI_DeleteObject($hHBitmap) _WinAPI_ReleaseDC($__g_hGUI_MarkArea, $hDC) _GDIPlus_PenDispose($hPen) _GDIPlus_PenDispose($hPen2) _GDIPlus_PenDispose($hPen3) _GDIPlus_BrushDispose($hBrush) EndFunc ;==>PlayBorderAnim Func WM_ERASEBKGND($hWnd, $iMsgm, $wParam, $lParam) ;suppress repainting to avoid flickering but causes some other side effects #forceref $iMsgm, $wParam, $lParam, $hWnd Local Const $hBrush = _WinAPI_CreateSolidBrush(0xEFCDAB) ;BGR format ;~ _WinAPI_RedrawWindow($__g_hGUI_MarkArea, 0, 0, BitOR($RDW_NOERASE, $RDW_NOCHILDREN, $RDW_NOFRAME, $RDW_VALIDATE)) _WinAPI_SetClassLongEx($__g_hGUI_MarkArea, $GCL_HBRBACKGROUND, $hBrush) _WinAPI_DeleteObject($hBrush) Return 0 EndFunc ;==>WM_ERASEBKGND  
      Just press the lmb and move your mouse. When lmb is released you can adjust the size of the window by dragging the white rectangle to any direction. Rmb will move the marked area.
      Press ESC to get the coordinates of the marked region.
      If you have any improvements, please post it here.
       
      Tested on Win10 x64 only.
       
    • By Epic007
      Hey guys I'm stuck with a program.....I need a make an automation which copies text from a chat bot app and paste it in notepad to log the replies of my chat bot and to analyse stuff....a lil help pls
       
       
       
       
       
       
       
      Thanks in advance
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