In order to enhance the dynamic range of digital imaging system, we have brought forward processing image by the
Cyclone II chip and controlling HTPS's high-density liquid crystal unit. The system in this paper proposed a kind of low
cost solution, the luminous intensity entering each pixel of CCD can be adjusted directly accurately. Meanwhile, the
attenuation luminance coefficients set by system algorithm and precision parameters can be adjusted artificially on the
physical level to satisfy different needs. It is proving that the function of partial gating image is realized by the image
processing experiment in which the details of the final image are more obvious and clear than the original. Then the
system latitude problem is solved fundamentally. The image of partial gating is obtained through the experiment, and
then the anticipated goal has achieved successfully.