A Method of Noise Control using in Shearography Inspection System

The shearography inspection technology is extremely fitting for the non-destructive testing of composites, tyres, panels of vehicle or airplane. But the testing image of shearography includes much speckle noise, so noise control is a very important task. A method called real time integrated porcessing is presented is this paper, especially, wavelet transform method is multi-resolution analysis, it can reduce noise, and at the same time, can keep the details of the image. The wavelet noise control technique is studied in this paper particularly. Experimental results are satisfactory.