document: Strain contouring using Gabor filters : principle and algorithm Moire interferometry is a powerful technique for high sensitivity in-plane deformation contouring . However , from an engineering viewpoint , the derivatives of displacement , i.e. , strain , are the desired parameter . Thus there is a need to differentiate the displacement field . Optical and digital methods have been proposed for this differentiation . Optical methods provide contours that still need to be quantified , while digital methods suffer from drawbacks inherent in the digital differentiation process . We describe a novel approach of strain segmentation for the moire pattern using a multichannel Gabor filter . Appropriate filter design allows for user-specific segmentation , which is essentially in engineering design and analysis
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