Tesseract 使用＆安裝 筆記

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homebrew install tesseract

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homebrew install tesseract-lang

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Error: invalid option: --with-training-tools

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pip install pillow

pip install pytesseract

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tesseract 4.1.1
leptonica-1.80.0
libgif 5.2.1 : libjpeg 9d : libpng 1.6.37
: libtiff 4.1.0 : zlib 1.2.11 : libwebp 1.1.0 : libopenjp2 2.3.1
 Found AVX2
 Found AVX
 Found FMA
 Found SSE

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tesseract --list-langs

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tesseract --help-oem

OCR Engine modes:
  0    Legacy engine only.
  1    Neural nets LSTM engine only.
  2    Legacy + LSTM engines.
  3    Default, based on what is available.

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· 1 (1-bit pixels, black and white, stored with one pixel per byte)
· L (8-bit pixels, black and white)
· P (8-bit pixels, mapped to any other mode using a colour palette)
· RGB (3x8-bit pixels, true colour)
· RGBA (4x8-bit pixels, true colour with transparency mask)
· CMYK (4x8-bit pixels, colour separation)
· YCbCr (3x8-bit pixels, colour video format)
· I (32-bit signed integer pixels)
· F (32-bit floating point pixels)

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# opencv 方式讀取圖檔轉灰度
imgcv = cv2.imread('CaptchaImage.jpg', cv2.IMREAD_GRAYSCALE)
type(imgcv)
cv2.imshow('CaptchaImage', imgcv)
cv2.imwrite('output/gray05.tiff', imgcv)
cv2.waitKey(0)
cv2.destroyAllWindows()

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    print 'binary mode: ', binary.mode
    print binary.getpixel((0, 0))
    co = binary.getcolors()
    print co
    
    #輸出
    ----------------------------------------
    binary mode: 1
    0  #左上角為黑色
    [(503, 0), (1993, 1)]
    共有幾個黑與白像素點

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Usage:
  tesseract --help | --help-extra | --version
  tesseract --list-langs
  tesseract imagename outputbase [options...] [configfile...]

OCR options:
  -l LANG[+LANG]        Specify language(s) used for OCR.
NOTE: These options must occur before any configfile.

Single options:
  --help                Show this help message.
  --help-extra          Show extra help for advanced users.
  --version             Show version information.
  --list-langs          List available languages for tesseract engine.

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Page segmentation modes:
  0    Orientation and script detection (OSD) only.
  1    Automatic page segmentation with OSD.
  2    Automatic page segmentation, but no OSD, or OCR. (not implemented)
  3    Fully automatic page segmentation, but no OSD. (Default)
  4    Assume a single column of text of variable sizes.
  5    Assume a single uniform block of vertically aligned text.
  6    Assume a single uniform block of text.
  7    Treat the image as a single text line.
  8    Treat the image as a single word.
  9    Treat the image as a single word in a circle.
 10    Treat the image as a single character.
 11    Sparse text. Find as much text as possible in no particular order.
 12    Sparse text with OSD.
 13    Raw line. Treat the image as a single text line,
       bypassing hacks that are Tesseract-specific.

OCR Engine modes:
  0    Legacy engine only.
  1    Neural nets LSTM engine only.
  2    Legacy + LSTM engines.
  3    Default, based on what is available.

Single options:
  -h, --help            Show minimal help message.
  --help-extra          Show extra help for advanced users.
  --help-psm            Show page segmentation modes.
  --help-oem            Show OCR Engine modes.
  -v, --version         Show version information.
  --list-langs          List available languages for tesseract engine.
  --print-parameters    Print tesseract parameters.