The influence of gray scale to joint transform corre-lator is analyzed and a method of gray-scale transformation is given to process the object plane of joint transformcorrelator.

• 应用此方法,可以明显地增强相关峰的亮度,成功地解决了由于模块所在的灰度级范围与目标所在背景的灰度级范围相差较大所带来的影响问题。