An improved model of Charge Transfer Inefficiency and correction algorithm for the Hubble Space Telescope
Charge-Coupled Device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as Charge Transfer Inefficiency (CTI), which trails bright objects as the image is read out. It is often possible to corre...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2014
|
| _version_ | 1826305486869233664 |
|---|---|
| author | Massey, R Schrabback, T Cordes, O Marggraf, O Israel, H Miller, L Hall, D Cropper, M Prod'homme, T Niemi, S |
| author_facet | Massey, R Schrabback, T Cordes, O Marggraf, O Israel, H Miller, L Hall, D Cropper, M Prod'homme, T Niemi, S |
| author_sort | Massey, R |
| collection | OXFORD |
| description | Charge-Coupled Device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as Charge Transfer Inefficiency (CTI), which trails bright objects as the image is read out. It is often possible to correct most of the trailing during post-processing, by moving flux back to where it belongs. We compare several popular algorithms for this: quantifying the effect of their physical assumptions and tradeoffs between speed and accuracy. We combine their best elements to construct a more accurate model of damaged CCDs in the Hubble Space Telescope's Advanced Camera for Surveys/Wide Field Channel, and update it using data up to early 2013. Our algorithm now corrects 98% of CTI trailing in science exposures, a substantial improvement over previous work. Further progress will be fundamentally limited by the presence of read noise. Read noise is added after charge transfer so does not get trailed - but it is incorrectly untrailed during post-processing. |
| first_indexed | 2024-03-07T06:33:34Z |
| format | Journal article |
| id | oxford-uuid:f6da09f1-78c6-496c-8131-be7449d01bee |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:33:34Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:f6da09f1-78c6-496c-8131-be7449d01bee2022-03-27T12:38:03ZAn improved model of Charge Transfer Inefficiency and correction algorithm for the Hubble Space TelescopeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f6da09f1-78c6-496c-8131-be7449d01beeEnglishSymplectic Elements at Oxford2014Massey, RSchrabback, TCordes, OMarggraf, OIsrael, HMiller, LHall, DCropper, MProd'homme, TNiemi, SCharge-Coupled Device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as Charge Transfer Inefficiency (CTI), which trails bright objects as the image is read out. It is often possible to correct most of the trailing during post-processing, by moving flux back to where it belongs. We compare several popular algorithms for this: quantifying the effect of their physical assumptions and tradeoffs between speed and accuracy. We combine their best elements to construct a more accurate model of damaged CCDs in the Hubble Space Telescope's Advanced Camera for Surveys/Wide Field Channel, and update it using data up to early 2013. Our algorithm now corrects 98% of CTI trailing in science exposures, a substantial improvement over previous work. Further progress will be fundamentally limited by the presence of read noise. Read noise is added after charge transfer so does not get trailed - but it is incorrectly untrailed during post-processing. |
| spellingShingle | Massey, R Schrabback, T Cordes, O Marggraf, O Israel, H Miller, L Hall, D Cropper, M Prod'homme, T Niemi, S An improved model of Charge Transfer Inefficiency and correction algorithm for the Hubble Space Telescope |
| title | An improved model of Charge Transfer Inefficiency and correction
algorithm for the Hubble Space Telescope |
| title_full | An improved model of Charge Transfer Inefficiency and correction
algorithm for the Hubble Space Telescope |
| title_fullStr | An improved model of Charge Transfer Inefficiency and correction
algorithm for the Hubble Space Telescope |
| title_full_unstemmed | An improved model of Charge Transfer Inefficiency and correction
algorithm for the Hubble Space Telescope |
| title_short | An improved model of Charge Transfer Inefficiency and correction
algorithm for the Hubble Space Telescope |
| title_sort | improved model of charge transfer inefficiency and correction algorithm for the hubble space telescope |
| work_keys_str_mv | AT masseyr animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT schrabbackt animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT cordeso animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT marggrafo animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT israelh animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT millerl animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT halld animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT cropperm animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT prodhommet animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT niemis animprovedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT masseyr improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT schrabbackt improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT cordeso improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT marggrafo improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT israelh improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT millerl improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT halld improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT cropperm improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT prodhommet improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope AT niemis improvedmodelofchargetransferinefficiencyandcorrectionalgorithmforthehubblespacetelescope |