[Objective] To study the digital image compression technology in rice monitoring system.[Method] A digital image compression technology program based on the discrete Fourier transform was proposed,and simulation experiments were carried out to compress the image at different compression ratios.[Result] When compression ratios were less than 30,the compression ratio,image entropy,average codeword length,coding efficiency and redundancy which reflected the quality of the coding,and the parameter PSNR which es...