DCM相位梯度提取技术在等达因图像处理中的应用

DCM Phase-gradient Extraction in Isodyne Image-distinguishing

将一种直接从数字编码博氏变换或相移条纹图中逐相素提取相位梯度的方法应用于光力学等达因图像信息识别中。该方法是一个根植于广泛应用于光线传感器中的微分正交乘法器(DCM)的正、余弦相位检波技术,这一技术算法简单,不需计算反正切,不受相位去包裹方法标准的限制。在此以载波等达因条纹图应力场计算为例对该技术在等达因图像信息识别中的应用进行了论证。

An approach to computing pixel-by-pixel gradients of optical directly from digitally encoded Fourier-transform or phase-stepped fringe patterns is used in the information recognition of Isodyne fringe pattern.This approach can be classified as a sine-cosine demodulation technique that find its roots in the differential cross-multiplier phase-demodulation technique commonly used by the optical fiber sensor community.This technique is algorithmically simple,does not rely on a computation of the arctangent,and therefore is not subject to some of the limitations of the standard phase-unwrapping methodologies.The proposed phase-gradient technique is demonstrated by the calculation of stress fields from a carrier wave Isodyne fringe pattern.