Update README.md

README.md

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 # About `sbb_binarization`
 
-This is a model for document image binarization. It can be used 
-to convert all pixels in a color or grayscale document image to 
-only black or white pixels. The main purpose is to improve the 
+This is a CNN model for document image binarization. It can be 
+used to convert all pixels in a color or grayscale document image 
+to only black or white pixels. The main purpose is to improve the 
 contrast between foreground (text) and background (paper) for 
 purposes of OCR. The model is based on a `ResNet50-Unet` model.