A difforent frequency generation of nonlinear optical crystals of AgGaSe_2 and AgGaS_2 has been analyzed based on the three-wave coupled equation and energy consesrvation in the phase-matching of type-Ⅰand type-Ⅱ.

Based on the calculation and discussion on the phase-matching,walk-off angle,acceptance angle and effective nonlinear coefficient for the KTP crystal,and on the numerical simulations of the angle-tuning curve and gain curve,the tuning spectrum and cutting angle of the KTP was finally established as 1.

Energy conversion process and spatial distribution of forward-propagating signal wave and backward-propagating wave of sum frequency under phase-matching condition were investigated.

The principles of laser frequency transformation and the theory of phase matching in nonlinear optic crystals are also discussed.

According to the characteristics of the computer image used in algorithm measurement,an image matching algorithm was presented,which is a correlation matching algorithm under epipolar line based on multi-resolution.

A fast image correlation matching algorithm is put forward for low contrast TV image sequence of a ship s target using genetic algorithms.

Traditional image correlation matching algorithm works under a pure translation model and would face difficulty when dealing with a more general motion model where either scaling or rotation of the matched images is present.

This paper describes one of the main problems of image-based correlation tracking systems,and proposes a new solution of using modified MCD correlation matching and adaptive modal modification based on multiple frame cumulation.