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Solved Assignments: Q. Explain Different Linear Methods For Noise Cleaning?

Linear smoothing filters are a method to remove noise by convolving the original image with a low-pass filter mask, such as a Gaussian mask. This convolution averages each pixel's value with those of its neighbors, blurring the image. Anisotropic diffusion is another linear method that uses a partial differential equation to remove noise without blurring edges, by using an edge-detecting diffusion coefficient that is spatially constant.

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96 views3 pages

Solved Assignments: Q. Explain Different Linear Methods For Noise Cleaning?

Linear smoothing filters are a method to remove noise by convolving the original image with a low-pass filter mask, such as a Gaussian mask. This convolution averages each pixel's value with those of its neighbors, blurring the image. Anisotropic diffusion is another linear method that uses a partial differential equation to remove noise without blurring edges, by using an edge-detecting diffusion coefficient that is spatially constant.

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Q. Explain different linear methods for noise cleaning? - Solved Assignments

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Q.Explaindifferentlinearmethods fornoisecleaning?
Noise reduction is the process of removing noise from a signal. Noise reduction techniques are conceptually very similar regardless of the signal beingprocessed,howeveraprioriknowledgeofthe characteristicsofanexpectedsignalcanmeanthe implementations of these techniques vary greatly dependingonthetypeofsignal. Allrecordingdevices,bothanalogueordigital,have traitswhichmakethemsusceptibletonoise.Noise canberandomorwhitenoisewithnocoherence,or coherentnoiseintroducedbythedevice's mechanismorprocessingalgorithms. Inelectronicrecordingdevices,amajorformof noiseishisscausedbyrandomelectronsthat, heavilyinfluencedbyheat,strayfromtheir designatedpath.Thesestrayelectronsinfluence thevoltageoftheoutputsignalandthuscreate detectablenoise. Inthecaseofphotographicfilmandmagnetictape, noise(bothvisibleandaudible)isintroduceddueto thegrainstructureofthemedium.Inphotographic film,thesizeofthegrainsinthefilmdeterminesthe film'ssensitivity,moresensitivefilmhavinglarger sizedgrains.Inmagnetictape,thelargerthegrains ofthemagneticparticles(usuallyferricoxideor

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Q. Explain different linear methods for noise cleaning? - Solved Assignments

magnetite),themorepronethemediumistonoise. Tocompensateforthis,largerareasoffilmor magnetictapemaybeusedtolowerthenoisetoan acceptablelevel. Linearsmoothingfilters Onemethodtoremovenoiseisbyconvolvingthe originalimagewithamaskthatrepresentsalow passfilterorsmoothingoperation.Forexample,the Gaussianmaskcompriseselementsdeterminedby aGaussianfunction.Thisconvolutionbringsthe valueofeachpixelintocloserharmonywiththe valuesofitsneighbors.Ingeneral,asmoothingfilter setseachpixeltotheaveragevalue,oraweighted average,ofitselfanditsnearbyneighborsthe Gaussianfilterisjustonepossiblesetofweights. Smoothingfilterstendtobluranimage,because pixelintensityvaluesthataresignificantlyhigheror lowerthanthesurroundingneighborhoodwould "smear"acrossthearea.Becauseofthisblurring, linearfiltersareseldomusedinpracticefornoise reductiontheyare,however,oftenusedasthe basisfornonlinearnoisereductionfilters. [edit]Anisotropicdiffusion Mainarticle:Anisotropicdiffusion Anothermethodforremovingnoiseistoevolvethe imageunderasmoothingpartialdifferential equationsimilartotheheatequationwhichiscalled anisotropicdiffusion.Withaspatiallyconstant diffusioncoefficient,thisisequivalenttotheheat equationorlinearGaussianfiltering,butwitha diffusioncoefficientdesignedtodetectedges,the noisecanberemovedwithoutblurringtheedgesof

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Q. Explain different linear methods for noise cleaning? - Solved Assignments

theimage. [edit]

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