I read a form of total variation like this: $\sum\sqrt{||\nabla f||_2^{2}+^2}$
What does the plus and squred sign mean? Shouldn't it just be $\sum\sqrt{||\nabla f||_2^{2}}$ ?
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Where did you see this? – littleO Mar 03 '18 at 12:34
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https://www.osapublishing.org/oe/abstract.cfm?uri=oe-21-23-27668 In Methods Part, Step 3 – Kicr Mar 03 '18 at 15:18
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Are you referring to equations (15) and (16) in the paper? The formula does not appear to be copied correctly in your question. Did you omit the $\epsilon$? – littleO Mar 03 '18 at 18:45
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@littleO the equation 10 in this paper https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5155489/ Sorry I referred to the wrong paper. I think it does mean $\epsilon$. It should be the same as the equation(16) in the wrong paper. Thanks! – Kicr Mar 04 '18 at 06:14