The traditional sensor in micropositioning system is usually high cost and can only be used in 1-degree of freedom system. In order to solve those problems

a displacement measurement method for micro-positioning based on computer-micro-vision is proposed. In this method

micro vision imaging model is established based on the pinhole imaging theory

and then the Jacobin matrix between image coordinate and micropositioning platform coordinate is estimated. After that

the image is binarized and morphological processing is performed to filter the noise. Then

the connected domain is extracted and calculated. By change of the coordinates of gravity

the output displacement of the micropositioning can be figured out. Experimental results demonstrate that this method is convenient and efficient

it can obtain good measurement precision

which can be applied in output displacement measurement of micropositioning

platform.