Trapezoidal correcting system for projector

The present invention relates to a projector trapezium correction system. On the output end of picture current of projector the invented projector trapezium correction system can be adopted to make image processing. Said processing method includes the following steps: firstly, making the picture current be passed through A/D converter circuit to obtain digital signal, after having been processed making the digital signal be passed through D/A converter circuit to obtain analog signal and output it; using FPGA chip as image processing core chip, the FPGA chip is connected with data and control port of microprocessor, utilizing microprocessor to control FPGA to execute operation, said microprocessor has memory, clock and power supply module, image processing software is used for processing video signal, in which pretreatment adopts Kaiser window and Sinc function filter to make filtration, the correction adopts line interpolation algorithm and ZEROPAD edge sawtooth correction technique and signal communication between chips adopts I2C bus connection.