| 摘要 |
<p>Provision is made for equalizing the optical channels (12a to 12i) of multichannel optical imaging systems (11) dynamically while the imaging systems are idle (i. e., not printing). To that end, the output intensities of the channels are sampled (32) at a predetermined resolution of n channels/measurement, where n is an integer selected from a range 1, 2,... N/2, and N is the total number of channels contained by the imaging system, for providing a calibrated reference intensity for the imaging system and for then determining correction factors (36) for the respective channels or groups of channels to equalize them to that reference intensity. To minimize the effect of defective channels on the channel balance that is achieved, any nd channels which are found to have a nominal, uncorrected output intensity level below a predetermined percentage of a system-wide average maximum output intensity level are ignored (Fig. 12) while calibrating the reference intensity for the imaging system. Advantageously, the correction factors are recursively computed through the use of an iterative process (121, Fig. 14). <IMAGE></p> |
