Performance comparison of various BSS methods on standard test images: LCS (orange), GMCA (blue), GMCA-biorthogonal (green), and FastICA (red). Left panel: mean PSNR values on the source matrix (S) as a function of the input noise level (k_noise). Right panel: corresponding mean component angle (CA) values on the mixing matrix (A). Each point represents the average and standard error over ten independent realisations of both the mixing mixing matrices (A) and the noise.