Geometric parameter measurement based on image sequence

With the continuous development of measurement technology, modern industry imposes a high demand on product dimension measurement accuracy and speed. This paper presents a method to measure the objects by using image sequences. A digital camera was used to capture calibration template image sequences, and the camera intrinsic parameters were obtained by direct linear transformation (DLT) method. Combined with the knowledge of imaging lens, the object-s image sequences provided by digital camera were processed and measured, and the object-s width and height were calculated ultimately. Experiments show that the method is simple and practical, which overcomes the shortcomings of traditional measurement and could control measurement error within 1%.