Patent ID: 9582118
Date: 2017-02-28
CPC Classifications: G06F

Claim:
1. An object detection method for an optical touch system, the optical touch system identifying at least one object according to an image of the object blocking light and an image of the object reflecting light, the object detection method comprising: acquiring, from a same direction with respect to the object, a first image by a first sensing matrix and a second image by a second sensing matrix, wherein the first image has a brightness information and is formed by the object blocking the light and the second image has an image feature and is formed by the object reflecting the light; acquiring, by the first sensing matrix, a first background image having a brightness information without any object image and acquiring, by the second sensing matrix, a second background image having an image feature without any object image; respectively calculating a representative brightness of every column of pixels in the first image and the first background image according to the brightness information; calculating a difference between the representative brightness of every column of pixels in the first image and that in the first background image, and defining a part of columns of pixels having the difference larger than a brightness threshold as an object range of the object; calculating a first image feature within a pixel range in the second image after the object range is determined, wherein the pixel range in the second image is associated with the object range; calculating a second image feature within the pixel range in the second background image after the object range is determined, wherein the pixel range in the second background image is associated with the object range; calculating a difference between the first image feature and the second image feature; and identifying a block information of the object within the object range according to the calculated difference between the first image feature and the second image feature.