1. An automated method for detecting and displaying corrosion or crack defects in an object by a computer on a display, comprising: obtaining a first of a plurality of ultrasound images of the object acquired with guided Lamb waves generated by a transducer; processing the first image of the object by the computer using a synthetic aperture focusing technique (SAFT) to enhance a resolution and a signal to noise ratio of a first extracted ultrasonic image of the object; applying a systemic background noise suppression algorithm to the first extracted ultrasonic image of the object by the computer to generate a second extracted ultrasonic image of the object having reduced noise; and applying a deconvolution linear filtering process by the computer to the second extracted ultrasonic image of the object to render a third extracted ultrasonic image of the object on the display.