In-camera processing of long-exposure RAW data

Started Jan 21, 2010 | Discussions thread
rhlpetrus Forum Pro • Posts: 25,950
D7000 hot pixels

Hot pixels seem more common in the new sensor for D7000. Could it be because of change in this HPS algorithm?

http://forums.dpreview.com/forums/read.asp?forum=1034&message=37043348

bob elkind wrote:

Mark Hollister wrote:

Thanks, Marianne for staying on this. I'm very interested in seeing where this goes. It's been a while since I read this thread, but I think I remember reading that a fix for this is beyond the scope of a firmware fix, is that right?

The fact that HPS is disabled above a certain shutter speed suggests that firmware does indeed control HPS. The enable/disable option which Marianne (and others) would like to use is probably a relatively simple programming addition.

It's less clear that a modified algorithm for implementing HPS would be a firmware-only change. It's plausible that the HPS filter is implemented in the image processing hardware. If so, the chances are greater rather than lesser that a modification of the algorithm would have to be implemented by disabling the filter in hardware, and either filter the images in processor firmware (slower than hardware) or defer HPS to post processing (e.g. CNX2).

This is all wild speculation of course. And Nikon are usually reluctant to share details of sensor structure and shortcomings (e.g. hot pixels) to 3rd parties such as Adobe or Bibble et al.

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Renato.
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