Interesting tricks, but it seems impractical or even dangerous. For example, showing the images at a specific quick refresh rate may cause them to not appear on some monitors, or worse, may annoy some people whose eyes are more sensitive, possibly even trigger an epileptic seizure.

In the end, if the content is meant to be seen by people, it is copyable. Seeing presumes the information is being transmitted. The only compromise you can make is to watermark, i.e., degrade quality and only hint at the full image.