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Kernel 4.10.5 boot problem with Radeon R7 370

Yesterday I was bitten by kernel update (to 4.10.5) on my main computer (I use Fedora 25). The boot process would at some point just stop, with nothing suspicious in the last visible boot messages; the machine was responsive, though, and Ctrl-Alt-Del reboot was possible. Booting using the previous kernel was fine. After reviewing the boot log (where -1 means second-to-last boot, -0 would be the last (successful) boot etc.): journalctl -k -b -1 it turned out there was a problem uploading f

GreatAttractor

GreatAttractor

 

Ray tracing on GPU & prospects for stacking

Recently I’ve dusted off my old ray tracing code, done some OpenGL reading/refreshing, and implemented real-time ray (and path) tracing on GPU. It turns out the present-day GLSL (OpenGL shading language) is capable enough, and even an integrated Intel graphics has acceptable performance. Video: https://www.youtube.com/watch?v=2lAmO1Ghtn0   The most important part is the ability to use the hierarchical scene graph (tree); thanks to this, ray tracing’s time complexity is only

GreatAttractor

GreatAttractor

 

Stabilized videos of aircraft

It turns out ImPPG's image alignment (via phase correlation) function comes in handy when trying to capture a video of passenger aircraft at cruising altitudes. My rig for the experiment was a SW Newtonian 114/500 (hence the coma visible in asymmetric highlights) on AZ4 + PGR Chameleon 3 mono (ICX445) camera:     Raw video looked e.g. like this (scaled down):     I cut out fragments with the plane constantly visible, converted to image sequences and run them through ImPPG.   Airbus A

GreatAttractor

GreatAttractor

 

ImPPG (Image Post-Processor)

ImPPG has moved to GitHub: http://greatattractor.github.io/imppg/     ImPPG performs Lucy-Richardson deconvolution, unsharp masking, brightness normalization and tone curve adjustment. It can also apply previously specified processing settings to multiple images. All operations are performed using 32-bit floating-point arithmetic.   Supported input formats: FITS, BMP, JPEG, PNG, TIFF (most of bit depths and compression methods), TGA and more. Images are processed in grayscale and can be

GreatAttractor

GreatAttractor

 

ImPP (Image Post-Processor)

NOTE: This program has been superseded by ImPPG, which includes all the below functionality in a full-fledged GUI. Image Post-Processor performs Lucy-Richardson deconvolution, histogram stretch, gamma correction and unsharp masking. Both a command-line tool and a graphical user interface (GUI) wrapper for processing of multiple files are available. Discussion threads: http://stargazerslounge.com/topic/230841-impp-%E2%80%93-batch-lucy-richardson-deconvolution-and-more-of-stacks/ http://sol

GreatAttractor

GreatAttractor

 

imgalt

imgalt – Image Alignment Tool author: GreatAttractor Written with solar animation frame alignment in mind. Uses the phase correlation method to detect translations of an image sequence, which can be widely varying, the images severely cropped – exactly what one gets after a few hour solar session with telescope buffeted by wind, drift due to imperfect polar alignment and lack of manual correction in time etc. The same method of image alignment is also included in ImPPG (starting w

GreatAttractor

GreatAttractor

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