someone tell me what image streaming is

So I’m in the process of learning and developing my own set of loci and I read that by doing a technique called image streaming, I am able to train myself to make associations faster and more vivid. But what exactly is IS? On one page it says the steps involve me sitting in a meditative position and describing aloud every sensation I feel for 10mins+ , and another page says that it is looking at a picture then closing my eyes and try to recall its every detail.

Is it a combination of both or are they separate practices?

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