Particle detection
Particle candidates were identified by treating each processed frame with per Laplacian of Gaussian filter that matched the size of the PSFs durante our mass photometry setups (Supplementary Fig. 16). 0011 for all datazione except the scadenza mediante Extended Momento Figs. 2, 3, 8 and Supplementary Figs. 3 and 13, for which the threshold was serie preciso 0.0014), and applying a local maximum filter. The pixels that passed the threshold map and were also local maxima were used as coordinates for particle candidates. For each pair of candidate coordinates, a 13 ? 13 pixel region of interest was constructed with the candidate pixel at the center, and this region of interest was passed through our PSF-fitting procedure onesto quantify particle contrast and location. If a particle candidate was too close puro an edge of the field of view puro construct per 13 ? 13 region of interest, that is, within 6 pixels of an edge, it was discarded. Sopra some cases, preparazione noise features were identified as particle candidates and this could lead preciso the PSF fit converging onto verso nearby particle con the region of interest, which resulted in duplicate fits.
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