To solve the non-uniformity problem of multi-TDICCD mosaic camera

a real-time non-uniformity correction algorithm was proposed and implemented on FPGA platform. Firstly

the definition of PRNU and the reason of non-uniformity in multi-TDICCD mosaic camera imaging were introduced. Secondly

the synthetical correction algorithm was presented

which was two-point correction method in single channel

gain averaging correction method among multi channels

scene-adaptive correction method among multi TDICCDs. Finally

considering the reliability and the influence of finite word-length of FPGA

the synthetical correction algorithm was optimized

and implemented on signal processing FPGA platform. Furthermore

the correction parameters could be modified after spaceborne calibration when necessary. The experimental results indicate that the non-uniformity can be decreased from 4.82% to 0.27% for one TDICCD

and to 0.41% for 3-TDICCD mosaic camera with the proposed correction algorithm

which proves that this correction algorithm has high real time performance

good practicality and efficiency

and satisfies the requirements of target project.