SharpCap Forums

my quads are the complex sort - I set up a co-ordinate system based on the two stars that are further from each other and then (with a couple of tweaks to ensure that the hash codes are not disturbed by mirror imaging) the co-ordinates of the two remaing stars make your hash codes. Actually the slo...

As I explained to Jean-Francois above, I think the speed is helped by the fact that I am doing quite a bit of the spherical geometry calculations before writing the index. One of the biggest parts of what is left is calculating the invariant properties (hash code values) of the quads - this require...

Hello Robin, I have experimented with your SharpSolve in simulation. It works very well. Congratulation with the very good performance! Out of curiosity I have experimented with the SharpSolve performance at very short exposure times v.s. ASTAP (my creation). They perform very similar. So the star d...

SharpCap has this input window: https://docs.sharpcap.co.uk/4.0/SharpCapUserManual_files/image389.jpg The solver requires only FOV. Entering the focal length requires the correct pixel size from the camera drive. Is it not more efficient (and reliable) to enter the FOV directly. That makes helping n...

Hi Robin, Hi Graem, The bleeding effect I made visible here: https://sourceforge.net/p/astap-program/discussion/general/thread/b25ef74481/0b0b/attachment/fits%20vs%20png.png beta to send FITS files to Astap rather than PNG, but if the difference is down to the debayering process then that will proba...

Both TIFF and PNG support deflate (ZIP) as best standard looseness compression algorithm, so I don't think there is much to gain with PNG. Secondly PNG is limited to 16 bit only. What about the other header info? Only if you have a free format you could store all fits KEYWORDS but then you do the sa...

David is suggesting two options: Option 1: Writing Exif metadata tags to a TIFF IDF via the TIFF Private Tag 0x8769 which is standarized . Option 2 Using TIFF private tags for e.g CFA is standardized in TIFF/EP ISO 12234-2:200. This could be utilized but will it fulfill all requirements? For stackin...

I know this is a very old topic, but it is a good start for me to discuss the S/N for the dominant sky noise case: 1) binning increases the signal-to-noise-ratio (SNR) of an image 2) CMOS style software binning increases the SNR in proportion to the N (of NxN binning), so 2x2 doubles the SNR, 3x3 tr...

I have only one RPI4. But you can just swap the SD card in the RPi4. Installing Win11 on the RPI4, 4 gbyte mem was easy but slow and takes two or more hours. Performance of Win11 on the RPi4 was not great but sufficient for testing. Yes a Win11 ARM64 laptop would be better for testing. For the recor...

Just for info, I have just created a Windows ARM64 version of the ASTAP command line solver. It is 375% faster then the X86 version. I tested it under Win11 running on a Raspberry Pi. Compiling the GUI version of ASTAP was not successful. So X86 emulation slows down a lot.

Han