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- Speckle_noise abstract "Speckle is a granular 'noise' that inherently exists in and degrades the quality of the active radar, synthetic aperture radar (SAR), medical ultrasound and optical coherence tomography images.The vast majority of surfaces, synthetic or natural, are extremely rough on the scale of the wavelength. Images obtained from these surfaces by coherent imaging systems such as laser, SAR, and ultrasound suffer from a common phenomena called speckle. Speckle, in both cases, is primarily due to the interference of the returning wave at the transducer aperture. The origin of this noise is seen if we model our reflectivity function as an array of scatterers. Because of the finite resolution, at any time we are receiving from a distribution of scatterers within the resolution cell. These scattered signals add coherently; that is, they add constructively anddestructively depending on the relative phases of each scattered waveform. Speckle noise results from these patterns of constructive and destructive interference shown as bright and dark dots in the image Speckle noise in conventional radar results from random fluctuations in the return signal from an object that is no bigger than a single image-processing element. It increases the mean grey level of a local area.Speckle noise in SAR is generally serious, causing difficulties for image interpretation. It is caused by coherent processing of backscattered signals from multiple distributed targets. In SAR oceanography, for example, speckle noise is caused by signals from elementary scatterers, the gravity-capillary ripples, and manifests as a pedestal image, beneath the image of the sea waves.The speckle can also represent some useful information, particularly when it is linked to the laser speckle and to the dynamic speckle phenomenon, where the changes of the speckle pattern, in time, can be a measurement of the surface's activity.".
- Speckle_noise wikiPageID "24174221".
- Speckle_noise wikiPageLength "9171".
- Speckle_noise wikiPageOutDegree "20".
- Speckle_noise wikiPageRevisionID "655663460".
- Speckle_noise wikiPageWikiLink Adaptive_filter.
- Speckle_noise wikiPageWikiLink Capillary_wave.
- Speckle_noise wikiPageWikiLink Category:Radar.
- Speckle_noise wikiPageWikiLink Category:Synthetic_aperture_radar.
- Speckle_noise wikiPageWikiLink Dynamic_speckle.
- Speckle_noise wikiPageWikiLink Frost_filter.
- Speckle_noise wikiPageWikiLink Gaussian_noise.
- Speckle_noise wikiPageWikiLink Laser_speckle.
- Speckle_noise wikiPageWikiLink Lee_filter.
- Speckle_noise wikiPageWikiLink Mean.
- Speckle_noise wikiPageWikiLink Mean_(mathematics).
- Speckle_noise wikiPageWikiLink Median.
- Speckle_noise wikiPageWikiLink Medical_ultrasound.
- Speckle_noise wikiPageWikiLink Optical_coherence_tomography.
- Speckle_noise wikiPageWikiLink Radar.
- Speckle_noise wikiPageWikiLink Refined_Gamma_Maximum-A-Posteriori_(RGMAP)_filter.
- Speckle_noise wikiPageWikiLink Salt-and-pepper_noise.
- Speckle_noise wikiPageWikiLink Salt_and_pepper_noise.
- Speckle_noise wikiPageWikiLink Speckle_pattern.
- Speckle_noise wikiPageWikiLink Synthetic_aperture_radar.
- Speckle_noise wikiPageWikiLink Variance.
- Speckle_noise wikiPageWikiLinkText "Image Despeckling".
- Speckle_noise wikiPageWikiLinkText "Speckle noise".
- Speckle_noise wikiPageWikiLinkText "speckle noise".
- Speckle_noise wikiPageWikiLinkText "speckle".
- Speckle_noise hasPhotoCollection Speckle_noise.
- Speckle_noise wikiPageUsesTemplate Template:Cite_book.
- Speckle_noise wikiPageUsesTemplate Template:Cite_conference.
- Speckle_noise wikiPageUsesTemplate Template:Reflist.
- Speckle_noise subject Category:Radar.
- Speckle_noise subject Category:Synthetic_aperture_radar.
- Speckle_noise type Article.
- Speckle_noise type Article.
- Speckle_noise comment "Speckle is a granular 'noise' that inherently exists in and degrades the quality of the active radar, synthetic aperture radar (SAR), medical ultrasound and optical coherence tomography images.The vast majority of surfaces, synthetic or natural, are extremely rough on the scale of the wavelength. Images obtained from these surfaces by coherent imaging systems such as laser, SAR, and ultrasound suffer from a common phenomena called speckle.".
- Speckle_noise label "Speckle noise".
- Speckle_noise sameAs m.07k6sqw.
- Speckle_noise sameAs Q7575045.
- Speckle_noise sameAs Q7575045.
- Speckle_noise wasDerivedFrom Speckle_noise?oldid=655663460.
- Speckle_noise isPrimaryTopicOf Speckle_noise.