slope detection method

Hough transform is a usual method for the image edge detection. It has been used in the underwater acoustic field for estimation combined with time-frequency analysis, exemplified by estimate the frequency slope of the LFM signal with wigner-Hough transform.

Hough变换是一种用于边缘检测的图像处理手段，在水声信号处理中已被用来与时频分析手段联合起来对信号进行估计，例如Wigner-Hough变换利用对直线的Hough变换来估计线性调频信号斜率等。

A new slope change detection method is also discussed based on a dual model approach.

基于双模型法，本文还提出了一种新的披露微小倾向变化的方法。

This article studies the detection for rust-eaten of metal surface with double-frequency vortex method, and then establishes the relation between the degree of rust-eaten and slope of distance effect curve.

对采用双频涡流法检测金属表面的锈蚀进行了研究，建立了金属锈蚀程度与提离效应曲线斜率之间的关系。