Selected processing steps of Ko observation taken on 14/09/1912: panel a: original density image, panel b: first estimate of background map (after Step 1.4), panel c–h: results of each step of the iterative process (Steps 2.1–2.5), panel e and panel f: correspond to Step 2.3. The black square in panel f shows the dimensions of the window used for the median filter in Step 2.4 (see Sect. 3.1 for details).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.