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SPOQ: norm ratio sparsity restoration (How I discovered sparsity and stopped worrying about it)

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[TL;DR] How I discovered sparsity and stopped worrying about it

This is a journey into sparsity. The story started in 2009, in the South of France, and the nice island of Porquerolles.


There was a workshop in June called Porquerolles 2019: Approximation and optimization in image restoration and reconstruction. A bunch of first class researchers were there: 
Amel Benazza-Benyahia, Jérôme Bolte, Antonin Chambolle, Caroline Chaux, Philippe Ciuciu, Albert Cohen, Patrick Louis Combettes, Claude Comtat, Christine de Mol, Alvaro R. De Pierro, Michel Defrise, Ron DeVore, Jalal Fadili, Mario Figueiredo, Massimo Fornasier, Jacques Froment, Yves Goussard, Gabor Herman, Jérome Idier, Dirk Lorenz, Russell Luke, Francois Malgouyres, Pierre Maréchal, Ali Mohammad-Djafari, Stanley Osher, Valérie Perrier, Jean-Christophe Pesquet, Gabriel Peyré, Aleksandra Pizurica, Andrew Reader, Elena Resmerita, Marc Sigelle, Gabriele Steidl, Marc Teboulle, Joel Trussell, Michael Unser, Dimitri Van de Ville, Isao Yamada

Chants des confins : compilation on COVID-19/coronavirus occasion

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Confines' songs, Chants des confins : fin de partie, is now on YouTube. All but one
Chants des confins (Confines' songs) is one music for each (relaive) day of confinement due to the COVID-19 coronavirus pandemia. And two lines. Two rhymes. Rarely more. I listened to each song five times in a row before posting it. 
So far:  Frankie Goes To Hollywood, Pink Floyd, Télépopmusik,, Henry Purcell (by Sarah Connolly  and Marianne Beate Kielland), Villagers of Ioannina City, Philip Glass with Lavinia Meijer (harp), Dave Brubeck & Paul Desmond (a kind of fake on Take five) (and the Stranglers), Mano Negra, Loney Dear, Sarah Vaughan, Deep Purple (and Navarone), The Kyteman Orchestra (Colin Benders), Dominique A (et Alain Bashung), VALD, George Frideric Handel (sung by Nathalie Stutzmann & Philippe Jaroussky), Kings of convenience and Feist, Les Têtes Raides, Yom (Guillaume Humery) and the wonder rabbis, Sting (interpreted by Pat Metheny, Nils Landgren, Esbjörn Svensson, Michael B…