Abstract: Auto reading recognition algorithms for pointer type meter are vulnerable to illumination，recognition accuracy for the meter with damping liquid is not high. In this paper, a new algorithm for the recognition of pointer meter based on space transformation is proposed. In detail, the proposed approach firstly selected the circle of meter region, and extracts the inner circle contour of the region by edge extraction in order to confirm the parameters of image transform and dial into the circular rectangle; Secondly, to obtain the pointer image by image mosaic processing, then redraw the scale lines to get its coordinates; Finally, meter reading is derived by image subtraction to obtain the center line coordinates of the pointer region, and then the reading recognition is identified by the relation between the pointer and scale lines. Light experimental result show that the identification of the pointer and scale lines were smaller effected by illumination. Calibration instrument result show that the proposed algorithm has better recognition efficiency and accuracy.