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EVALUATION OF GRAY INTENSITY VALUE FOR RELIABLE DIGITIZATION OF DIGITAL RADIOGRAPHY IN DEFECT DETECTION

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Author(s): P.Chitra | B.Sheela Rani | B.Venkatraman | Baldev Raj

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 8;
Start page: 6160;
Date: 2011;
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Keywords: Gray value | Digital radiography | Radiographic techniques | Image processing

ABSTRACT
Radiography is one of the oldest NDT technique used for evaluation of weld defects in metal. Radiographic defects are classified based on the shape, location, orientation, depth, width etc. Once a radiographof a weld is taken, the radiographer examines the same for identifying the defects and quantitatively evaluating the same based on codes and specifications. In recent years digital imaging has superseded conventional imaging, which has led to a profound change in interpretation of radiographic images. A change in the Gray values of the digital image (edges) indicates the flaws on the radiographic image. This paper discusses the Gray level distribution of a test piece radiograph. The test piece considered is a stainless steel metal plate on which a square hole is drilled with different area and depth. The plate is radiographed using X-ray and gamma rays (IR192).
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