Detect watermark text if exists

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Hg
Hg 2020-11-5
评论： Hg 2020-11-12
Hi I would like to remove images that contains watermark text. Is there any simple way to check whether there's a watermark in the center of the image or not?
I don't need to identify any logo, just want to check if there's a high possiblity that watermark exists. If there's a way to make the watermark text clear, I can use OCR to do text detection.

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