Patent ID: 7322118
Filing Date: 2008-01-29
Classification: G01C

Abstract:
1. A non-contact electronic level, comprising: a light source; a vial having a bubble and positioned to be irradiated by light from the light source; a photo sensor located at a position corresponding to the bubble at a fixed distance from the vial, the photo sensor capturing an image of the bubble after the vial is irradiated by the light source; and an image processing unit electrically coupled to the photo sensor for converting the image of the bubble into an electronic level signal by comparing the centroid of the image of the bubble with a predetermined point; wherein the x, y coordinates of the centroid is calculated using the following formulae: where m is the total pixel number along the horizontal axis of the image of the bubble, n is the total pixel number along the vertical axis of the image of the bubble, B is the weight of the pixel (i, j), and A is the total number of pixels in the image of the bubble.