<div dir="ltr">I'm unsure of the impact of things like bad pixels on align, guide, focus. It's possible, but it's also the case that all of these modules use stellarsolver as a star detector, and the star detection has min-area usually set to > 1, often 10. One would hope that this too would remove the hot pixels. <div><br></div><div>Also, we would need to be careful of the interactions between the image processing here and the SEP star detection.</div><div><br></div><div>Hy</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 13, 2021 at 12:36 PM Jasem Mutlaq <<a href="mailto:mutlaqja@ikarustech.com">mutlaqja@ikarustech.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello all,<div><br></div><div>We have "dark" subtraction available in KStars for the align/focus/guide modules. I was about to begin implementing a new way to build a dark library for images. However, Han pointed out that using bad pixels maps actually may yield better results, and it's a lot simpler than taking all the darks and stacking them using different combinations of binning/exposures/...etc. Therefore, I put the dark library revamp on hold as I investigate this venue.</div><div><br></div><div>PHD2 uses both methods to remove noise from images. I believe it would substantially improve focus/guide/align modules if we can introduce a SIMPLE method to remove MOST of the noise. Remember this is used to help these modules operate correctly, it's not used for post-processing images.</div><div><br></div><div>What do you think? Shall we adopt bad pixel maps to remove hot/cold pixels? Do we need to do this like darks for multiple exposures/temperature/...etc and save the results somewhere? or a "master" map would be sufficient to get the job done?</div><div><br></div><div>Hy previously introduced "Show Clipping" to highlight saturated pixels in the image, could this be used as a startup point? I presume something akin to PHD2 Bad Pixel Map (BPM) wizard?</div><div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div>--</div><div>Best Regards,<br>Jasem Mutlaq<br></div><div><br></div></div></div></div></div></div></div></div>
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