This is the best subframeselector tutorial I have seen. Not only for what you are explaining but because you are explaining it very well. Thank you again.
@AdamBlock3 жыл бұрын
Just a small part of what is available on my site.
@stephen26152 жыл бұрын
My brain hurts.. But seriously, I had no idea of the power of this feature. I intend to explore SFS functionality a lot more. Thanks for this video.
@AstroPhotoFacts2 жыл бұрын
All your videos are the Best PixInsight explanation i have see! , many thanks for your great support Adam , From Azores Portugal :)
@AdamBlock2 жыл бұрын
Thank you!
@mrrockenrock3 жыл бұрын
Another great Adam Block video that is true to his technique of explaining why we do what we do in Pixinsight. Sign up for his fundamentals videos to learn both how and why PI is processing your images. You won't ever be disappointed!
@rikutalvio3 жыл бұрын
Cool concept! People are using weights blindly, be it WBPP or just slapping on a formula they found online, without ever really examining the charts and graphs. I think this could be worked into something that is more foolproof than any simple weighting formula. For my data Eccentricity is a bad metric because low Eccentricity is often accompanied by high FWHM. This method gets me around that problem. SNRWeight is still problematic, though, as it really likes anything bright passing by.
@Nico.752 жыл бұрын
Thanks a lot for this great tutorial! One question - should I now use your weighting expression or the "PSF Signal Weight" for registering and integration? Thank you for a short feedback. :)
@AdamBlock2 жыл бұрын
I think the answer is yes... I hope to be doing some comparisons soon.
@christianvulpescu13983 жыл бұрын
Just stunning, dear Adam! The only thing, I didn't get is, why not weight just by stars. Why is the punishing thing of the SNR necessary? CS Christian
@AdamBlock3 жыл бұрын
Stars count fails under other conditions as well. There is no single metric that does it properly in my opinion. So you use more than one to confirm/modify the other and gain greater confidence in the result.
@christianvulpescu13983 жыл бұрын
@@AdamBlock Thank you. Now I understand. 😃👍
@AnakChan3 жыл бұрын
That's great work Adam. Would love to see if the PI folks would consider integrating your formula into SubFrame Selector. I noticed that you didn't use FWHM and Eccentricity as I guess this formula is targeted to weigh specifically on noise evaluation. If you're able to delve into a similar analysis w.r.t. FWHM and Eccentricity too that'll be greatly appreciated as I found (at least in my setup where I'm shooting at 2500mm FL with 3.76µm pixel pitch), I scrutinise and question the accuracy of FWHM esp vs HFR (which I get output from N.I.N.A.) and visual pixel peeping. I find that visual, esp double stars where I scrutinise the separation, tends to agree with HFR more so than FWHM, and I think Eccentricity is related to it. NB: I know FWHM and HFR slices and dices different aspects of the star and therefore as a measurement it's somewhat comparing Granny Smiths to Red Delicious, however I've just found FWHM to be less useful when used in a Weighting calculation.
@AdamBlock3 жыл бұрын
My opinion is that resolution of images is secondary to S/N. It doesn't matter how sharp your images are if you cannot see your object (or it is too noisy to process). Eccentricity is also a secondary metric for me in general. If only a fraction of images are elongated- the combination of rejection and integration will still yield OK images. I see people outright reject these frames. If you have a ten minute exposure- and wind-shake or bad guiding make elongated stars- that tiny one second excursion means through out the frame? If the object is a faint nebula/galaxy- the small tracking errors will have no significant effect on the quality of the integrated result.
@ExoPhotography12 жыл бұрын
Just watched this and read your update in the video description, just to clarify - Is SFS now updated so that the SNRW shows "right" values according to how the images looks like? /Daniel
@AdamBlock2 жыл бұрын
Pixinsight now has new measures that are improved. Whether they work to the degree necessary is still an open question.
@ExoPhotography12 жыл бұрын
@@AdamBlock I’ll check it next project :)
@IcedReaver3 жыл бұрын
Nice video and critical thinking, even though you admitted to not being a mathematician in you PI post! Some questions. At this point, are you only looking at your best subs? Would you evolve your formula to further add weight based on the FWHM and star eccentricity values of the best subs? I ask this as I first use the approval box above the weighting box to reject subs based on their FWHM and eccentricity values in conjunction with blinking my images, and I then apply weighting afterwards, but I'm wondering if we can't use the same type scaling formula for these properties in addition to the SNRweight.
@AdamBlock3 жыл бұрын
I am considering the full spectrum of subframe quality (from poor to good). As mentioned above, my answer today is that my primary weighting method is using star flux through NSG. There is only one weight to you assign an image with respect to ImageIntegration... so you need to pick the method to do it...
@saritageetsangeet3 жыл бұрын
बहुत सुंदर आपके घर आ कर बहुत अच्छा लगा कल आप इसी टाइम आयेगा चाय पीने हमने 👍डन 👍कर दीया 👍
@franckmalterre60873 жыл бұрын
Thanks Adam for another great tutorial
@AdamBlock3 жыл бұрын
This is just an added (extra) section. The main instructional videos are more explanatory and useful for typical usage.
@yomichee2 жыл бұрын
Adam I want to buy one of your courses - I just started this November, spent cash on decent modest equipment and have some data to work with. I have just purchased PI and have done a couple of your tutorials posted here and appreciate your teaching method. I just don't know which one to get. I want to learn to stack properly and use the processes like the ones you have spotlighted here (baited me lol) Please advise. TIA, Michele.
@AdamBlock2 жыл бұрын
Hi Michelle- I basically have two collections (VERY LARGE) of videos. Fundamentals is where to start- it will answer all of the questions you want to know now..and perhaps many you haven't thought of yet. :) Horizons is the subscription based additional set of videos that you can enjoy after absorbing the material in Fundamentals. I would encourage you to read the reviews and see what others say.. www.adamblockstudios.com/categories/Reviews Thanks!!
@terryrobison3 жыл бұрын
Excellent video and insight into weighting images
@AdamBlock3 жыл бұрын
Thanks Terry.
@neverfox3 жыл бұрын
In the comments of your first video on NSG, you mentioned to me "I have really never been a fan of weighting images based on FWHM or the other metrics. Too much emphasis on this! Usually the quality of an image is based on the ultimate S/N... and when you give crappy images more weight than they are worth you are hurting this ultimate result. So... I value this [NSG] signal-noise based weighting over things found in SFS." Now you're showing how to calculate weights from SFS metrics. What am I missing? Have you changed your preference?
@AdamBlock3 жыл бұрын
Not at all. I still agree with myself! However, not everyone does and I certainly want to show different ways of thinking about things. The fact I need to bend over backwards and create some function to get what I want is just another bit of evidence in my book. :)
@M31glow3 жыл бұрын
great post! This is a great lesson o how t think mathematically
@AdamBlock3 жыл бұрын
Thank you.
@mrrockenrock2 жыл бұрын
Hi Adam, Is there a way to get a Fits header number to show up in Subframe Selector? I am trying to get Nweight to show up here so I can plot it vs PSF Power or vs PSF Signal. (Maybe Python, but I don't know how to use it.) Alternately if I could get the File name (which has the wXXX (Nweight) at beginning of name) in name order and index number, then at least I could see if PSF power and PSF signal are trending in the same direction as Nweight. I have a love/hate relationship with this Subframe selector tool! Like, why not have the data presented in the plot according to the sort data in Measurements table? There is a huge amount of data calculated for subframe selector, and such an inflexible plotting tool. Oh, yes, I can export a CSV file and take it into Excel, and plot to my heart's content!
@AdamBlock2 жыл бұрын
That is what I use.(Excel) You can copy and past the output of the Console into Excel and make columns quickly...and you will note I have been very quiet on the relationship between NSG and PSF signal. I would give it a little time before doing the analysis you want to do. Likely the PSF Signal calculation will be evolving.
@mrrockenrock2 жыл бұрын
@@AdamBlock Of course I have a big smile on my face. Going to use Nweight because I need it anyway for simplifying gradients.
@jualbar13 жыл бұрын
graciassss graciassssss. perfecto. tengo una sola duda mi camara es una asi 1600 mm segun dice esta entre los 12 bits? puede ser. y asi tengo que poner? 12 bits.,? la tabla ya me dio la info el field of view calculador poniendo la camara y el sky watchwer sprit 80 da 1.45 de arco por pixel
@AdamBlock3 жыл бұрын
Yes, in the initial "System Parameters" you should specify 12-bit if that is what your sensor is. This will affect some of the calculated values- it will be easier to understand things if you set this correctly.
@anata5127 Жыл бұрын
What about eccentricity and FWHM? I select eccentricity below 0.7 and FWHM no more than 20% of theoretical including seeing. Oh, forgot about selection by numbers of stars. I am surprised by seeing your eccentricity and FWHM. I thought your FWHM will be
@siriusfritz40033 жыл бұрын
The pixels must be punished!
@AdamBlock3 жыл бұрын
Yes! When are go bad... punish 'em! lol
@bogdanbacila90242 жыл бұрын
frustrating way of explaning...could not follow till the end..