Filtering Techniques to reduce Speckle Noise and Image Quality Enhancement methods on Satellite Images

Nasir, Mohammad; Devi, T. Meera

doi:10.9790/0661-1541015

Cited by 17 publications

(4 citation statements)

References 8 publications

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“…The image quality index was assumed to be the signal-to-noise ratio (SNR) in the calculations. The estimation of this coefficient shows the noise level, where the size of the coefficient is inversely proportional to the amount of noise [34]. Brighter areas have a stronger signal due to more light, resulting in a higher overall SNR.…”

Section: Estimation Of Statistical Parametermentioning

confidence: 99%

Industrial Application of Surface Crack Detection in Sheet Metal Stamping Using Shift-and-Add Speckle Imaging

Świłło,

Cacko

2023

Adv. Sci. Technol. Res. J.

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The sheet metal surface crack detection during manufacturing is an essential issue because of both the product quality and process productivity. Development of solutions to eliminate defective products during the metal forming process is crucial for the smooth production and for developing an appropriate tool geometry in the initial phase of the process. Currently, the methods of surface crack detection used in the industry are mostly related to visual inspection. These are methods that require operators of industrial facilities considerable attention and effort to capture emerging discontinuities on the sheet metal surface. Also, this situation results increase in the duration of the specific operations of stamping and significantly reduces productivity. Therefore, an industrial application of a non-contact laser technique that simultaneously provides the results of the speckle imaging is presented. The authors demonstrate a specially designed machine vision system along with experimental tools for the stamping operation. Proposed solution uses the phenomenon of speckle pattern that appears in the image of the investigated sheet surface produced by the laser beam emission. In this method, coherent laser light is emitted to the surface, where a speckle pattern is generated due to scatter reflection from the sheet metal surface and then, shift-and-add technique and image processing is applied. The proposed measurement technique consists, initially, of making a sequence of images of the tested object for the moving surface of the sheet. Secondly, the object's displacement quantity in each image is determined, and the position is corrected. The test object in each image is moved to the starting position, and all images are superimposed. It allows to obtain a high-quality image with visible surface defects. Finally, the dynamically changing speckle pattern intensity is evaluated using Gaussian-of-Laplacian edge detection to investigate a surface crack location due to the surface discontinues and light scattering. This process is recommended for machine vision imaging of distant objects, which works well in industrial conditions as well as online analysis. Also, from the speckle size measurement, an experimental procedure is employed to verify the best condition for vision system resolution.

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Section: Estimation Of Statistical Parametermentioning

confidence: 99%

Industrial Application of Surface Crack Detection in Sheet Metal Stamping Using Shift-and-Add Speckle Imaging

Świłło,

Cacko

2023

Adv. Sci. Technol. Res. J.

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“…Proses terakhir adalah speckle filter. Speckle filter dilakukan untuk mengurangi kesalahan yang diakibatkan oleh titiktitik putih (speckle) dan menyisakan bagian penting pada citra saat deteksi garis pantai (Raju et al, 2013).…”

Section: Tahap Penelitianunclassified

Deteksi Perubahan Garis Pantai Menggunakan Citra Synthetic Aperture Radar (SAR) di Pesisir Tenggara Bali (Kabupaten Gianyar dan Klungkung)

Artama

Karang

Putra

2019

J. Mar. Aquat. Sci.

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Coastline change is a phenomenon caused by sediment decrease or increase in the coastal area that occurs continuously. This phenomenon is caused by abrasion, erosion, and accretion. Bali is one of the provinces that have coastal with quite noticeable conditions, which is the southeast coast of Bali, the coast of Gianyar and Klungkung Regencies. Identification of coastline changes is important to determine policies that can be taken to maintain coastal balance. Remote sensing is one way to identify coastline change. In this study, the image used is SAR images of ALOS PALSAR and Sentinel-1 satellites with a resolution of 10 meters to extract the coastlines of Gianyar and Klungkung in 2007 and 2018. Method used for shoreline extraction is Image Threshold pproach. Coastline changes analysis in this study used the Digital Shoreline Analysis System (DSAS) application. Analysis results of coastline changes in Gianyar and Klungkung for 11 years in range shown the highest erosion and accretion occurred in the Klungkung coastal with erosion area reached 168,142.05 m2, and the accretion area reached 207,531.2 m2. Coastal change in Gianyar Regency caused by erosion reached 124,930.5 m2, and the accretion area reached 85,123.86 m2. The highest change rate in Gianyar occurred in Saba village at the rate of 2.63 m/year in erosion, whereas in Klungkung it occurred in Gunaksa village reaching 13.25 m/year in accretion.

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“…The fluctuations can cause the dark region within the image that will cause loss of information from the image. ilter [20] to handle the n the mean of an filter gene ter [20] used in orde y smoothenin anced by the u icfilter [21] d due to prob mechanisms. to extract the king.…”

Section:  Discrete Wavelet Transforms(dwt)mentioning

confidence: 99%

Image Encryption Strategies to Enhance Security of Image: An Exhaustive Analysis

Mohal¹

2017

ijarcs

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The accessibility of internet now a days is rapidly increasing that give rise to the problem of protection of digital media and its distribution over the internet. To shield digital media from any unapproved get to advanced watermarking is broadly utilized. It is a path through which a watermark as picture has been implanted and it contains exceptional data. This paper audits different procedures of advanced watermarking, watermarking applications. Additionally some current research in the field of watermarking systems for content reports has been looked into in this paper.

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Filtering Techniques to reduce Speckle Noise and Image Quality Enhancement methods on Satellite Images

Abstract: Noise in images is

Cited by 17 publications

References 8 publications

Industrial Application of Surface Crack Detection in Sheet Metal Stamping Using Shift-and-Add Speckle Imaging

Industrial Application of Surface Crack Detection in Sheet Metal Stamping Using Shift-and-Add Speckle Imaging

Deteksi Perubahan Garis Pantai Menggunakan Citra Synthetic Aperture Radar (SAR) di Pesisir Tenggara Bali (Kabupaten Gianyar dan Klungkung)

Image Encryption Strategies to Enhance Security of Image: An Exhaustive Analysis

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