Patent ID: 8218004
Filing Date: 2012-07-10
Classification: G01B,G06F,G06T

Abstract:
1. A displacement sensing system, for sensing a set of actual coordinates of an object in a planar specified area, the displacement sensing system comprising: a planar area, the planar area containing M×N virtual grids, wherein each intersection point between adjacent two said grids has a set of actual coordinates, and the object is placed on the planar area; a first image capturing device and a second image capturing device, settled at two opposite ends of a coordinate axis of the planar area, respectively, for capturing images of the planar area, wherein the planar area has a plurality of virtual blocks defined according to shooting ranges and shooting dead spaces of the first image capturing device and the second image capturing device, and each said intersection point in the corresponding said block has a set of image coordinates in the image of the planar area taken by the first image capturing device and has another set of image coordinates in another said image of the planar area taken by the second image capturing device; a plurality of LUT databases quantitatively equal to the blocks and for use of a matrix lookup table process, each said LUT database containing the actual coordinates and the image coordinates of the intersection points within the corresponding said block, and the image coordinates and the actual coordinates of the same intersection point being associated in the LUT database; and a plurality of table indexes established in the LUT databases corresponding to the first image capturing device and the second image capturing device, wherein the table index corresponding to the first image capturing device contains an index value representing the first image capturing device, and the table index corresponding to the second image capturing device, contains another index value representing the second image capturing device, while each said table index contains an index value representing that the object is not in any of the defined blocks.