In order to make SBUV-ICCD (Solar Blind Ultraviolet Enhanced CCD) detect variable radiation luminance's target

and avoid damage the device when it expose for high intensity radiation

a AGC (automatic gain control) algorithm has been proposed for SBUV-ICCD. The sum of N consecutive frames image's histogram has been treated as analysis object

divide it to four background section

target's section

brightness section and saturated section. The AGC algorithm has been accomplished using the proportion factor between brightness section and target's section as controlling parameters

also the coefficient between saturated section and brightness section. At last experiments has designed for test the performance of algorithm. Experimental results indicate that when the target's luminance boost up unexpected or fade rapidly

this algorithm can adjust the gain of ICCD quickly and effectively

make the image has satisfied resolution.