Steps in the detection of pores outside SARs. a): part of the original HMI intensitygram on 4 Oct. 2014 (axes indicate the pixel positions in the original image). b): mask indicating the positions of active regions. c): mask indicating the detection of all dark features (i.e. spots and pores). d): the final mask segmenting only pores outside SARs. The figures display a section of the full-disc frame captured on 4 October 2014 at 01:00:00 TAI. The ticks on both axes are in pixels, the disc centre is located at coordinates (2042,2048). The pixel size corresponds to 0.5′′.
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