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Auteur Peter T. Y. Shih |
Documents disponibles écrits par cet auteur (2)
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An experimental comparison of directly and indirectly derived modulation transfer functions / Chia-Hsiang Yang in Photogrammetric record, vol 30 n° 149 (March - May 2015)
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Titre : An experimental comparison of directly and indirectly derived modulation transfer functions Type de document : Article/Communication Auteurs : Chia-Hsiang Yang, Auteur ; Shue-Chia Wang, Auteur ; Peter T. Y. Shih, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 100 - 114 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse comparative
[Termes IGN] estimation de précision
[Termes IGN] étalement radiométrique
[Termes IGN] fonction de transfert de modulationRésumé : (Auteur) The modulation transfer function (MTF) is the indicator most frequently used for image resolution assessment. Traditionally in photogrammetry, the MTF is directly estimated using specifically designed targets such as the USAF 1952 three-bar resolution test target, but it can also be indirectly derived from the system degradation function known as the point-spread function (PSF). Theoretically, MTF and PSF are related through a spatial–frequency domain transformation (a Fourier transformation), meaning the same attributes are expressed in different domains. When using real images, however, it is not clear whether these two functions produce the same result. In this study, both spatial and frequency domain approaches were experimentally compared through simulations. Results show that the MTF derived from the PSF has better accuracy than an MTF estimated directly from the resolution target. Numéro de notice : A2015-365 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12098 Date de publication en ligne : 13/03/2015 En ligne : https://doi.org/10.1111/phor.12098 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76802
in Photogrammetric record > vol 30 n° 149 (March - May 2015) . - pp 100 - 114[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 106-2015011 RAB Revue Centre de documentation En réserve L003 Disponible Digital elevation quality derived from medium-format digital cameras / Peter T. Y. Shih in Photogrammetric record, vol 28 n° 144 (December 2013 - February 2014)
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Titre : Digital elevation quality derived from medium-format digital cameras Type de document : Article/Communication Auteurs : Peter T. Y. Shih, Auteur ; J.Y. Wu, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 416 - 435 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse comparative
[Termes IGN] appariement automatique
[Termes IGN] chambre à moyen format
[Termes IGN] données lidar
[Termes IGN] modèle numérique de surface
[Termes IGN] qualité des données
[Termes IGN] semis de pointsRésumé : (Auteur) Medium-format digital cameras are a useful tool in airborne lidar missions to produce digital ortho-images. This study investigates the quality of digital elevation models (DEMs) and digital surface models (DSMs) derived from such cameras. An image-matching strategy is used to produce height information from highly overlapping images and the quality of the derived height information is analysed using synchronous lidar point clouds as the reference data. The evaluation focused on various types of land cover and DEM generation methods. The RMSE between lidar and image-derived height information for two datasets was 0·054% and 0·027% of the flying height in flat, bare-earth areas, but studies with manually edited vegetated areas using stereo photogrammetry revealed high uncertainties, especially in steep terrain. Numéro de notice : A2013-631 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12039 Date de publication en ligne : 09/12/2013 En ligne : https://doi.org/10.1111/phor.12039 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32767
in Photogrammetric record > vol 28 n° 144 (December 2013 - February 2014) . - pp 416 - 435[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 106-2013041 RAB Revue Centre de documentation En réserve L003 Disponible