| 1. Identity statement | ||||
| Reference Type | Thesis or Dissertation (Thesis) | |||
| Site | mtc-m12.sid.inpe.br | |||
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Identifier | 6qtX3pFwXQZ3r59YD6/GPczH | |||
| Repository | sid.inpe.br/iris@1912/2005/07.20.06.48.47 | |||
| Last Update | 2014:12.23.13.30.12 (UTC) simone | |||
| Metadata Repository | sid.inpe.br/iris@1912/2005/07.20.06.49 | |||
| Metadata Last Update | 2023:04.06.18.20.52 (UTC) simone | |||
| Secondary Key | INPE-6125-TDI/586 | |||
| Label | 7476 | |||
| Citation Key | SantAnna:1995:AvDeFi | |||
| Title | Avaliação do desempenho de filtros redutores de "speckle" em imagens de radar de abertura sintética  | |||
| Alternate Title | Evaluation of the performance of speckle noise reduction filters in synthetic aperture radar images | |||
| Course | SER-SPG-INPE-MCT-BR | |||
| Year | 1995 | |||
| Date | 1995-11-17 | |||
| Access Date | 2024, Apr. 20 | |||
| Thesis Type | Dissertação (Mestrado em Sensoriamento Remoto) | |||
| Secondary Type | TDI | |||
| Number of Pages | 209 | |||
| Number of Files | 2 | |||
| Size | 9282 KiB | |||
| 2. Context | ||||
| Author | Sant'Anna, Sidnei João Siqueira | |||
| Group | SER-SPG-INPE-MCT-BR | |||
| Committee | Mascarenhas, Nelson Delfino d'Ávila (presidente/orientador) Yanasse, Corina da Costa Freitas Dutra, Luciano Vieira Orgambide, Alejandro Cesar Frery Mendonça, Gelson Vieira | |||
| University | Instituto Nacional de Pesquisas Espaciais (INPE) | |||
| City | Sao Jose dos Campos | |||
| History (UTC) | 2005-07-20 06:49:12 :: administrator -> jefferson :: 2007-01-17 17:53:37 :: jefferson -> Malu :: 2007-02-12 16:33:47 :: Malu -> jefferson :: 2007-02-13 14:35:40 :: jefferson -> administrator :: 2007-02-16 20:03:20 :: administrator -> Malu :: 2007-02-16 20:14:27 :: Malu -> administrator :: 2009-07-08 19:36:12 :: administrator -> jefferson :: 2010-07-07 18:52:05 :: jefferson -> marciana :: 2012-02-07 16:56:52 :: marciana -> luis.cpv@hotmail.com :: 1995 2012-08-02 17:40:14 :: luis.cpv@hotmail.com -> supervisor :: 1995 2012-08-02 17:41:09 :: supervisor -> luis.cpv@hotmail.com :: 1995 2012-08-28 17:11:46 :: luis.cpv@hotmail.com -> ivone@sid.inpe.br :: 1995 2012-08-29 16:39:35 :: ivone@sid.inpe.br -> administrator :: 1995 -> 2012 2013-09-12 18:27:21 :: administrator -> marcelo.pazos@sid.inpe.br :: 2012 2013-09-12 18:29:00 :: marcelo.pazos@sid.inpe.br -> administrator :: 2012 -> 1996 2013-09-13 16:44:38 :: administrator -> marcelo.pazos@sid.inpe.br :: 1996 2013-09-13 16:45:10 :: marcelo.pazos@sid.inpe.br -> administrator :: 1996 -> 1995 2013-09-18 13:34:33 :: administrator -> marcelo.pazos@sid.inpe.br :: 1995 2013-09-18 13:36:44 :: marcelo.pazos@sid.inpe.br -> administrator :: 1995 2014-12-23 11:32:01 :: administrator -> sergio :: 1995 2014-12-29 11:41:08 :: sergio -> administrator :: 1995 2018-06-05 00:52:42 :: administrator -> sergio :: 1995 2020-04-06 18:37:13 :: sergio -> simone :: 1995 2020-04-06 18:45:36 :: simone -> administrator :: 1995 2023-04-06 17:40:34 :: administrator -> simone :: 1995 2023-04-06 18:20:52 :: simone -> :: 1995 | |||
| 3. Content and structure | ||||
| Is the master or a copy? | is the master | |||
| Content Stage | completed | |||
| Transferable | 1 | |||
| Keywords | radar de abertura sintética SAR speckle filtragem processamento de imagens synthetic aperture radar filtering digital image processing | |||
| Abstract | Em trabalho anterior (Ono, 1990) foram avaliados os desempenhos de vários filtros redutores de speckle em imagens reais de radar de abertura sintética (SAR), sob o ponto de vista da melhoria da relação sinal-ruído. Esta dissertação propõe-se a estender tal trabalho, sob três aspectos: (a) estudar o desempenho comparativo dos filtros analisados por Ono (1990) e os filtros desenvolvidos por Frery e Sant'Anna (1993b) sob o ponto de vista da melhoria do desempenho de classificação ponto a ponto por máxima verossimilhança, utilizando imagens SAR reais e em duas bandas (L e X); (b) estudar os filtros mencionados anteriormente sob ponto de vista da perda de resolução espacial. Tal perda é avaliada por dois métodos distintos: um através de deteção de bordas que utiliza um conjunto de imagens simuladas com ruído speckle e bordas ideais, e o outro através da medida da resolução em 4dB da resposta impulsiva de uma fonte pontual em uma imagem simulada; e (c) ampliar o estudo da a relação sinal-ruído destes filtros utilizando medidas de qualidade em uma imagem simulada. Além disso, propõem-se também, novos filtros pontuais e adaptativos redutores de speckle, sob o critério maximum a posteriori (critério MAP), levando-se em consideração o tipo de deteção no processador (linear ou quadratica) e diferentes modelagens da distribuição a priori do retroespalhamento (backscatter). ABSTRACT: In a previous work (Ono, 1990) the performance of several speckle reduction filters in real SAR images was evaluated from the standpoint of the signal-to-noise ratio improvement. This dissertation aims at extending that work in three directions: (a) the comparison of the relative performances of the filters analysed by Ono (1990) and those introduced by Frery and Sant'Anna (1993b) from the standpoint of the maximum likelihood pixel-to-pixel classification behaviour, using real SAR images and in two bands (L and X); (b) the study of the aforementioned filters from the standpoint of resolution loss. Such spatial resolution loss is evaluated by means of two different methods: one through edge detection, over a set of simulated speckled images and ideal edges, and the other, through the measure of the resolution at 4dB of the point spread function of a point target in a simulated image; (c) the enlarged study of signal- to-noise ratio of these filters using quality measures in a simulated image. Besides that, new pointwise and adaptive filters are proposed for speckle noise reduction: the ones based upon the maximum a posteriori (MAP) criterion, taking into account the kind of detection (linear or quadratic) and several models for the a priori backscatter distribution. | |||
| Area | SRE | |||
| Arrangement | urlib.net > BDMCI > Fonds > Produção pgr ATUAIS > SER > Avaliação do desempenho... | |||
| doc Directory Content | access | |||
| source Directory Content |
| |||
| agreement Directory Content |
| |||
| 4. Conditions of access and use | ||||
| data URL | http://urlib.net/ibi/6qtX3pFwXQZ3r59YD6/GPczH | |||
| zipped data URL | http://urlib.net/zip/6qtX3pFwXQZ3r59YD6/GPczH | |||
| Language | pt | |||
| Target File | publicacao.pdf | |||
| User Group | Malu administrator ivone@sid.inpe.br jefferson pubtc@inpe.br sergio simone | |||
| Visibility | shown | |||
| Copyright License | urlib.net/www/2012/11.12.15.10 | |||
| Rightsholder | originalauthor yes | |||
| Copy Holder | SID/SCD | |||
| Read Permission | allow from all | |||
| Update Permission | not transferred | |||
| 5. Allied materials | ||||
| Next Higher Units | 8JMKD3MGPCW/3F3NU5S | |||
| Host Collection | sid.inpe.br/banon/2001/04.06.10.52 | |||
| 6. Notes | ||||
| Empty Fields | academicdepartment affiliation archivingpolicy archivist callnumber contenttype creatorhistory descriptionlevel dissemination doi e-mailaddress electronicmailaddress format isbn issn lineage mark mirrorrepository nextedition notes number orcid parameterlist parentrepositories previousedition previouslowerunit progress readergroup resumeid schedulinginformation secondarydate secondarymark session shorttitle sponsor subject tertiarymark tertiarytype url versiontype | |||