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image inspection - unroundness values - would like to see 2 or 3 digits numbers

2022-09-27
2022-09-27
  • Gernot Schreider

    I have recently started to use ASTAP image inspection to help making judgments about collimation.
    I look at the eccentricity or to be precise the ASTAP unroundness values of stars. However the image inspection only gives one digit numbers, which I found to be of limited value due to the lack of precision.
    Would it be possible to get the numbers with a higher precision ? Two digits would make a big difference.

    Thanks
    CS
    Gernot

     
  • han.k

    han.k - 2022-09-27

    I have changed it now to 3 digits.

    The measurement works better for larger "stars". So for any testing it is best to set binning at 1x1 for best accuracy unless you have a OSC sensor. For OSC it is better to bin 2x2 the raw..

    I will release a new Linux and Windows version next hours.

    Han

     
  • Gernot Schreider

    wow, that was quick !
    Thanks a ton.
    Also thanks for the recommendation. I am using OSC, so I know now how to get the best out of the data

    CS
    Gernot

     
  • han.k

    han.k - 2022-09-27

    Just released. It was a coincidence. I was just making some other minor changes.

    Measuring roundness/aspect of a star is pretty difficult. The problem is that most flux is located in the center. The star tail doesn't contain much flux so there is a lot of noise in the signal. Maybe measuring the tail only is a better option. Or just count all pixel values above noise level equal. Something for the future.

    Han

     

    Last edit: han.k 2022-09-27

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