一个用vb编写指纹识别程序，它通过二值化图象，计算阈值和统计黑像素值来识别-vb prepared with a fingerprint identification procedures, it adopted two binary images, calculated and statistical threshold value of black pixels to identify

Stretches contrast on the image and normalize image from 0 to 1 The main difference of this function to the standard streching functions is that standard function finds global minimum and maximum on the image, then uses some low and high