This article proposes a new modified anisotropic diffusion scheme for automatic defect detection in radiographic\r\nfilms. The new diffusion method allows to enhance, to sharpen anomalies, and to smooth the background of the\r\nimage. This new technique is based on the modification of the classical diffusion rule by using a nonlinear\r\nsigmoidal function. Experimental results are carried out on multiple real radiographic recorded films of Gaz\r\npipelines of the ââ?¬Å?Tunisian Society of Electricity and Gas distribution: STEGââ?¬Å? and the society ââ?¬Å?Control officesââ?¬â??chemical\r\nand industrial analysis laboratories: Saybolt-Tunisiaââ?¬Å?. The new automatic defect detection method shows good\r\nperformance in comparison with other existing algorithms.
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