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This is an issue with both, I'd say. I've done some testing & increasing the image size by 3~ helps a lot with missing characters. I will add an option for you in today's release so you can adjust it. Bear in mind that a 3x increase in image size could significantly affect OCR speed, especially when capturing a large amount of text. I think it will be totally fine in your case though, with a good PC and a rather small capture area.

Even with an enlargened image, the last example you gave had the Japanese rec model struggle a lot without any preprocessing. The PPOCRv5 model almost captured it all on its own.
There can be a use case here of adding preprocessing options to the settings, but the reason it isn't already there is due to the PaddleOCR models being trained on actual images with text, not just plain black and white text. Thus, preprocessing can result in worse results, not necessarily better.

I am considering adding the option to use Google's OCR, but adding a new OCR pipeline is a lot more work than adding translation options.. I will have to investigate it further.

Thank you so much for your examples.