chore: remove personal notes
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# Image Pre-processing
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1. Invert image - Tesseract 3.0 only?
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2. Rescale
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3. Binarize
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4. Remove noise
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5. Dilation and erosion
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6. Rotation and deskewing
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7. Remove borders
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8. Missing borders
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9. Transparency and alpha channel
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## Invert Image
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```python
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inverted_image = cv2.bitwise_not(image)
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cv2.imwrite('tmp/inverted_image.jpg', inverted_image)
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```
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## Rescale
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## Binarize
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1. Grayscale image first.
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2. Convert to black and white.
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* Adjust threshold values, may require testing.
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## Remove Noise
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