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mdepot

How to checksum an image or bitmap directly in memory

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mdepot
Posted (edited)

I have a situation where I am repeatedly capturing a region of the screen and feeding it into Tesseract OCR.  Since the OCR is a relatively slow operation, I would like to create an in memory cache of the ocr results.  An ideal hash key for this cache would be a checksum of the captured image.  With this I could capture the region, checksum it, and then only if I don't get a cache hit I would write the image out to disk for external OCR.

Now I know I can do this by saving the captured image out to disk, and then summing the disk file with _Crypt_HashFile().  But that's still slower than I would like, and it shouldn't be necessary.  Ideally, it should be possible to checksum the image data directly in memory so I don't have to go to disk at all.  In order to do that, I need a way to dump a representation of the image into a string  (or some equivalent).  Then I could use the _Crypt_HashData() function against that string to create my cache hash key.

Googling around I found an article here that shows a way to convert an image object to a byte array using System.Drawing.  This was the closest thing I found to what I'm trying to do.  I don't know if that method could be used from within AutoIT, or if perhaps there may be a better way I don't know about.  If someone could give me a shove in the right direction it would be a big help.  Thanks!

Edited by mdepot

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jdelaney
Posted (edited)
PixelChecksum

If different, in a loop, then do the tesseract call?  It would be directly checking the pixels, rather than screenshoting them.

Edited by jdelaney

IEbyXPATH-Grab IE DOM objects by XPATH IEscriptRecord-Makings of an IE script recorder ExcelFromXML-Create Excel docs without excel installed GetAllWindowControls-Output all control data on a given window.

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      By badcoder123
      I was looking around the help file and I came across _GDIPlus_GraphicsDrawRect and _WinAPI_DrawLine and I seem to be having the same "problem" where every time it draws into a window and you lose or gain focus it has to redraw itself. Is there anyway around this? 
      #include <WindowsConstants.au3> #include <WinAPI.au3> #Include <GDIPlus.au3> _GDIPlus_Startup() Run("notepad.exe") $hWnd = WinWait("Untitled") $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hWnd) $Color = 0xFFFF0000 $hPen = _GDIPlus_PenCreate($Color, 2) For $i = 1 To 10 _GDIPlus_GraphicsDrawRect($hGraphic, 200, 200, 25 ,25, $hPen) ToolTip($i) Sleep(1000) Next _WinAPI_RedrawWindow($hWnd, 0, 0, $RDW_INVALIDATE + $RDW_ALLCHILDREN) _GDIPlus_GraphicsDispose($hGraphic) _GDIPlus_PenDispose($hPen) _GDIPlus_Shutdown()  
    • bhns
      By bhns
      try it for make flyers old games xml + Gdi, i belive many sources had lost 
      AIT-ADRLIST.au3

    • UEZ
      By UEZ
      Here some graphical examples written completely in FreeBasic just for fun.  
      3D Starfield Rotating Flight 3D Starfield Scrolling v1 Booster 3D Starfield Scrolling v3 Booster CreateWindowEx (hGUI) Example FB File2Bas Code Generator (AutoIt script) FB GFX Examples Fire Particles FMOD Examples GDI - GDI+ 3D Sinus Wave GDI - GDI+ Animated Pythagoras Tree GDI - GDI+ Particles - Repulsive Force Sim v2.0 GDI - GDI+ Plasma v5 Booster GDI - GDI+ Random Pattern GDI - GDI+ Space Flight GDI - GDI+ Tunnel Flight - WipeOut Style GDI Classic Raytraced Tunnel GDI Elastic Twister Effect GDI Exploding Pixels GDI Infinite Image Zoom Flight GDI Liquid Pixels GDI Particle Repulsion Grid GDI Particles Mouse Attraction GDI Starfield GDI The Nautilus Raymarcher GDI Worm Tunnel Flight GDI+ Impossible Possible GDI+ Kaleidoscope GDI+ Performance Test - Au3 vs FB GDI+ Polar Clock GDI+ Rotating Earth GDI+ Star Wars Scroller GDI+ Streamer GDI+ Swiss Railway Clock Ini Read - Write Mandelbrot Plasma Puristic Clock Rutt_Etra_Izer_Booster Tunnel Flight uFMOD _WinAPI_SetWindowTitleIcon  
      Download: FreeBasic Examples build 2018-07-10.rar
       
      I will add new examples from time to time.
       
      FreeBasic source codes are also included.
       
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