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Forums > Back > PP Sharpening Applied for Lens Data
#6
[quote name='genotypewriter' timestamp='1299800615' post='6660']

Klaus, how do you determine the USM radius?



GTW

[/quote]



There's no hard rule. Upon a start of a new test system we're analyzing the USM effect (with different parameters) on the center portion of an image taken at the sweet spot of a lens. Usually we stick to a smaller than average USM radius in order to avoid an unreasonable boost of the usually much weaker border/corner region.



Technically we're probably using too weak USMs. There're many lenses which are outperforming an AA-less sensor in the image center after all. However, it is, of course, reasonabe to stay below the max. resolution of a sensor after USM and I do actually refuse to sharpen aggressively (remember then Pentax K-5 discussions about this). While imatest can look a bit beyond Nyquist due to being able of making assumptions about the test target (an assumption-less Nyquist can't look beyond the barrier, of course) I don't really think that this is overly reliable anymore.
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Messages In This Thread
PP Sharpening Applied for Lens Data - by clkirksey - 03-09-2011, 02:47 PM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-10-2011, 12:36 AM
PP Sharpening Applied for Lens Data - by Klaus - 03-10-2011, 06:55 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-10-2011, 11:43 PM
PP Sharpening Applied for Lens Data - by mst - 03-11-2011, 07:06 AM
PP Sharpening Applied for Lens Data - by Klaus - 03-11-2011, 07:30 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-11-2011, 11:05 AM
PP Sharpening Applied for Lens Data - by mst - 03-11-2011, 11:06 AM
PP Sharpening Applied for Lens Data - by Klaus - 03-11-2011, 11:35 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-12-2011, 02:43 AM
PP Sharpening Applied for Lens Data - by mst - 03-12-2011, 10:28 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-16-2011, 06:14 AM
PP Sharpening Applied for Lens Data - by mst - 03-16-2011, 06:19 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-16-2011, 09:51 PM
PP Sharpening Applied for Lens Data - by mst - 03-16-2011, 11:41 PM
PP Sharpening Applied for Lens Data - by genotypewriter - 03-17-2011, 01:08 AM
PP Sharpening Applied for Lens Data - by mst - 04-01-2011, 06:52 AM
PP Sharpening Applied for Lens Data - by genotypewriter - 04-07-2011, 04:20 AM
PP Sharpening Applied for Lens Data - by mst - 04-07-2011, 05:01 AM

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