In order to improve the deficiencies of automatic light adjustment methods for traditional CCD camera system in engineering

a new full-automatic light adjustment method for CCD camera system is presented. Light is adjusted by couple of external trigger electronic shutter and iris diaphragm

with electronic shutter adjusting light mainly

and iris diaphragm adjusting supplemented. By adopting external trigger mode

electronic shutter time adjustment of CCD camera is realized. The aperture of iris diaphragm is adjusted by motor under the control of single-chip to make the image illumination moderate. Feedback control quantity is obtained by the mean level of the image’s target region

and full-automatic light adjustment is implemented. The composition and working principle of the new light adjustment system are narrated briefly. Matlab simulation results show that histogram related to image of the new light adjustment system is wide and uniform

and the value of its power spectra is more than 7.5dB. The image of the new light adjustment system is clean and high-contrast. The new light adjustment system is effective and satisfies requirements of the optimal full-automatic light adjustment for modern CCD camera system.