How to work with books in Japanese -
You must install the DJVU viewer - https://www.cuminas.jp/en/downloads/download?pid=1
Open the book and find the needed page, right-click mouse will open menus and select to save the page to BMP file.
If you use online OCR is necessary to reduce the size of the images, for this it is necessary to convert BMP file into another format via the website http://www.coolutils.com/ru/online/BMP-to-JPG or any program for working with graphics files.
On the site http://www.onlineocr.net/ - upload an image file, choose to save in Word format to avoid losing the structure of the text and push the button to recognize the text.
Save WORD file to recognize Japanese characters, you can now have to translate the text - or choose all or part of the text and copy to the http://translate.google.com/