Fig. 5From: Sparsity estimation from compressive projections via sparse random matricesExperiment 3: compressibility of real signals, with non-exactly sparse representations. We estimate k such that \(\frac {\left \|\widehat {x}_{k}-x \right \|_{2}^{2}}{\left \|x \right \|_{2}^{2}}<\tau \), where x and \(\widehat {x}_{k}\) respectively are the non-exactly sparse representation and its best-k approximationBack to article page