The Implementation of non-uniformity correction in multi-TDICCD imaging system

Abstract—a non-uniformity correction algorithm is proposed and implemented on a Field-Programmable Gate Array (FPGA) hardware platform to solve a problem of pixel response non-uniformity(PRNU) for multiple Time Delay and Integration Charge Couple Device(TDICCD) camera. The non-uniformity is introduced and a synthetical correction algorithm is presented, in which the two-point correction method is applied to a single channel, gain averaging correction method among multi-channel and scene-adaptive correction method among multiple-TDICCD. Then, the correction algorithm is generated. Finally, the FPGA ability for fix-point processing is analyzed; the correction algorithm is optimized, and implemented on FPGA. Testing results indicate that the non-uniformity can be decreased from 8.27% to 0.51% for three TDICCDs camera's images with this proposed correction algorithm, proving that this correction algorithm is with high real-time performance, great engineering realization and satisfaction for the system requirements.