Try Similar.Pictures (select "Image Search" button). It is a browser-based program I developed. You can use the program offline (fully browser-based), e.g. by hosting the page locally or by disconnecting from the Internet before scanning files. The limitation is the file read speed, type of images (browser readable only), and available memory. But if you have a good PC, I would say it is possible to scan 50-100 thousand images without a problem.
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