In this paper, a convenient judgement method about extreme value of one class multivariate functions-trivariate functions was given, and its application in reality was discussed.
本文给出一类多元函数—三元函数是否存在极值的快速判别方法，并讨论它在实际问题中的应用。
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Two shearlet-based denoising methods using trivariate prior model are proposed for image denoising. The dependency among shearlet coefficients is analyzed via mutual information.
In the first, we propose three coefficients Trivariate Shrinkage method, using this technique and geometry curvature-driven diffusion, a new high quality image noisy removal is obtained.