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hello friends welcome you all to the second video lecture on watermarking so here we should try to classify the various watermarking techniques based on its characteristics so how can we classify them the first one happens to be blind versus non-blind so what is blind water marking technique in blind water marking technique the technique is said to be blind if it does not require access of the original un watermarked data so when we talk about the original and watermark data we are talking about the host image or the host data to recover the watermark so we have the original unwatermark data you have the watermark the watermark is embedded and we get the watermarked image so therefore in order to extract the watermark if the original unwatermarked data is not required then such a technique is referred to as blind watermarking and this is most widely used now when we talk about non-blind technique so when we talk about a non-blind technique the original unwatermarked data is required t
