Image #61, basic processing [9 kB]
Download this image in fits [46 kB] format.
These images were obtained with an Ealing bandpass filter of 40 nm FWHM at f/45 with the SVST. Detector was a Kodak Megaplus 1.6 10-bit CCD with no cooling. Pixel scale 0.08 arcsecs.
This daylight image was obtained at an eastern elongation 25.2 degrees, using an 830 nm filter. A processing sequence is shown below.
The first image is after flatfielding. Second image is after fourier filtration with a Wiener filter constructed from frequency information of the flat- and dark-corrected image. Third image is result after further application of unsharp mask with amplification factor of 1.4 and filter size 5x5 pixels.
Hermeographic N is towards the upper cusp, E towards the limb. Classical features like the dark regions Solitudo Phoenicis, Solitudo Criphiori and Solitudo Persephones may be identified.
Observations and image processing by J. Warell. Please note that image quality is superior in the fits versions.
830 nm filter, UT 17:48, 250 ms exposure time. Mercury alt. 50 deg, sun alt. 29 deg.
Image #61, basic processing [9 kB]
Download this image in fits [46 kB] format.
Image #61, Wiener filtering [7 kB]
Download this image in fits [49 kB] format.
Image #61, unsharp masking [7 kB]
Download this image in fits [49 kB] format.
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