As curves can be approached by polygons, line judgment is very important in image analysis, recognition, measurement, etc where shape matching is needed.

A line-based judging method is brought out to deny the false corners,and the advanced feature is set up on it,which has improved the matching performance greatly.

In this paper, the author took the mathematics conjecture as a developmental thinking course and discussed the three principal thinking forms running through the course intuition inferences, intuition distinguishes, intuition imaginations.

Firstly,a direct linear discriminant analysis(dLDA) is used to perform feature extraction in the amplitude spectrum space of HRRP,and then the mean of each azimuth in the resulting amplitude spectrum subspace is used to train an one-against-all support vector machine(SVM) multi-class classifier for target recognition.

Applying the linear discriminant approach to the intermediate-term patterns of seismic chains, we present an approach to find the precursors of large earthquakes.

This paper uses the relationship of regression analysis and discriminant analysis to apply the method of influence analysis of regression analysis in discriminant analysis to discuss the influence of a set data to the precision of a sample linear discriminant function.