In order to improve the measure precision of linear CCD,this paper proposes a precision measuring instrument with STM32 as the core controller design scheme.The linear CCD drive is realized by programming with STM32.The special AD9826 chip is used for the noise processing and analog-to-digital conversion of CCD output signal which has relevant sampling and other special function.The paper describes CCD drive,relevant sampling technology,noise,sub-pixel positioning of the segmentation algorithm and key techn...