Method for airborne video capture and preprocessing based on FPGA

Video capture, color space conversion and video data transmission were researched in order to improve video capture and pre-processing performance of airborne multi-mode video coding system. Taking into account the requirements of real-time multi-mode video capture, a robust video capture strategy based on field-programmable gate array (FPGA) was designed. It monitors the correctness of video capture on-time to avoid accumulation of errors by adopting self-checking mechanism. To solve the problem of wastes of computing resources and increasement of power consumption in floating-point multiplication, a truncated look-up table multiplier based on the separation of high and low bits was designed to save memory and computation bandwidth. It achieves an efficient color space conversion combining pipeline technique, with power consumption decreasing 27% at most without loss of computing precision and processing performance. Considering the frequent transmission of mass data between FPGA and digital signal processor (DSP), a data interaction mechanism taking FPGA as the control core was proposed, adopting the transmission mode of serial rapid I/O (SRIO). The burden of DSP was alleviated due to concentrating on video coding, and thus the application performance was improved.