{"id":18562040,"url":"https://github.com/timstaley/coelacanth","last_synced_at":"2025-10-14T04:15:08.650Z","repository":{"id":17824622,"uuid":"20726566","full_name":"timstaley/coelacanth","owner":"timstaley","description":"Codes for EMCCD and Lucky-Imaging Analysis","archived":false,"fork":false,"pushed_at":"2014-06-24T15:56:48.000Z","size":484,"stargazers_count":1,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-05-15T17:50:51.776Z","etag":null,"topics":["astronomy","drizzle-algorithm","electron-multiplying-ccd","emccd","optical-astronomy"],"latest_commit_sha":null,"homepage":null,"language":"C++","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"other","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/timstaley.png","metadata":{"files":{"readme":"Readme.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2014-06-11T13:40:56.000Z","updated_at":"2020-10-22T03:08:44.000Z","dependencies_parsed_at":"2022-08-04T21:15:25.381Z","dependency_job_id":null,"html_url":"https://github.com/timstaley/coelacanth","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/timstaley/coelacanth","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/timstaley%2Fcoelacanth","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/timstaley%2Fcoelacanth/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/timstaley%2Fcoelacanth/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/timstaley%2Fcoelacanth/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/timstaley","download_url":"https://codeload.github.com/timstaley/coelacanth/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/timstaley%2Fcoelacanth/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":279017985,"owners_count":26086213,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","status":"online","status_checked_at":"2025-10-14T02:00:06.444Z","response_time":60,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["astronomy","drizzle-algorithm","electron-multiplying-ccd","emccd","optical-astronomy"],"created_at":"2024-11-06T22:08:37.236Z","updated_at":"2025-10-14T04:15:08.630Z","avatar_url":"https://github.com/timstaley.png","language":"C++","funding_links":[],"categories":[],"sub_categories":[],"readme":"#Coelacanth\n###Codes for EMCCD and Lucky-Imaging Analysis\n![logo](http://upload.wikimedia.org/wikipedia/commons/c/ce/Coelacanth-bgiu.png)\n\n*There's life in the old fish yet.*\n\n#### What is this?\n*Coelacanth* is an ongoing effort to refactor and document a collection of C++\ncodes I wrote for lucky-imaging data-reduction and analysis, as described in \nmy [PhD thesis]. \nThe hope is that it might be useful to others: either in whole, in part, or as\na cautionary lesson in how we used to do things.\n\n#### What's the fish got to do with it?\n\u003cem\u003eCo\u003c/em\u003edes for \u003cem\u003eE\u003c/em\u003eMCCD and \u003cem\u003el\u003c/em\u003eucky-imaging \u003cem\u003ea\u003c/em\u003enalysis == *COELA* , \nbut 'coelacanth' is more memorable. \nThat, and [C++03] is a bit of a dinosaur.\n\n#### So what's buried in there?\n- A framework for performing complex multi-coordinate-system pixel arithmetic on \n  two-dimensional pixel arrays.\n- A minimal, C++-style implementation of the [FITS] image-file format, \n  complete with bit-packing decompression.\n- A basic but reasonably performant implementation of the [Keys81]  algorithm for \n  [bicubic interpolation].\n- Routines for bright-speckle location via cross-correlation with a carefully \n  tuned PSF core model.\n- A simple (translation-only) but reasonably performant implementation of the \n  [Drizzle] algorithm.\n- High-performance Monte-Carlo simulation code for simulating EMCCD data from \n  light-intensity maps (built on [UNURAN]).\n- Fitting routines for extracting [EMCCD] parameters from raw data.\n\n- A full (multi-threaded) lucky-imaging pipeline, including: \n    - Asynchronous file-buffering and decompression\n    - Calibration routines for constructing per-pixel histograms from dark-frames \n      data\n    - Image debias / flat-fielding routines built upon the EMCCD calibration\n    - Photon-thresholding for faint targets\n    - Various routines for multi-EMCCD data-synchronisation and mosaic building.\n    \n\n- A set of decomposable, [DRY]-principle-adherent CMake build scripts.\n- Four years of sweat and C++ related tears.\n\n#### This sounds useful. How do I get started?\nUnfortunately there's no documentation yet, and progress is slow as this \nis effectively a side-project.\nHowever, if you're interested in digging in, do [get in touch] and I'll help\nout if I can.\n\n\n\n[C++03]: http://en.wikipedia.org/wiki/C%2B%2B03\n[Drizzle]: http://adsabs.harvard.edu/abs/2002PASP..114..144F\n[bicubic interpolation]: http://en.wikipedia.org/wiki/Bicubic_interpolation\n[DRY]: http://en.wikipedia.org/wiki/Don%27t_repeat_yourself\n[EMCCD]: http://en.wikipedia.org/wiki/Charge-coupled_device#Electron-multiplying_CCD\n[FITS]: http://en.wikipedia.org/wiki/FITS\n[get in touch]: http://timstaley.co.uk/\n[Keys81]: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=1163711\n[UNURAN]: http://statmath.wu.ac.at/unuran/\n[PhD thesis]: http://uk.arxiv.org/abs/1404.5907\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftimstaley%2Fcoelacanth","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ftimstaley%2Fcoelacanth","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftimstaley%2Fcoelacanth/lists"}