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Essay On Radiography

818 Words4 Pages

Conventionally film radiography is widely used for recording the images. In the present day context, power plants and components are expected to perform for over 40 to 60 years. It is thus necessary to have all the design and inspection records appropriately archived so that it can be used later. Digital archiving of data has unlimited life and retrieval capacity. Once the radiography is digitized computational intelligence and image processing methods can be applied for enhancing the quality of the radiographic image and for improving its sensitivity. As manual interpretation of weld radiographs is subjective in nature and is affected by operator fatigue, it necessitates automated interpretation of weld radiographs. For automatic detection of radiographic detection of radiographic defects there is an need of suitable image processing algorithm. Edge detection algorithm plays an very important role in detecting the boundaries of the defects which is further used for characterization of defects. Karargyris and Bourbakis (2010) proposed a method for detecting protrusions and perforated ulcers in wireless capsule endoscopy(WCE) images using SUSAN edge finder. The SUSAN is applied to extract the polyp occurring in small intestine. Gabor filter is used for segmenting the texture …show more content…

Welding is performed using different sources such as gas flame, electric arc, a laser, an electron beam, friction and ultrasound. After welding, discontinuities or interruptions may occur in the structure of the base metal, weld material, or in the heat affected areas. Discontinuities, which do not meet the requirements of the codes or specification, are referred to as defects. The most commonly occurring weld defects includes lack of fusion , lack of penetration or excess penetration, porosity, inclusions , crack and

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