Patent ID: 8909037
Filing Date: 2014-12-09
Classification: G02B,G03B,H04N

Abstract:
1. An auto-focus system using multiple lenses, adapted for an image capture device having a first lens, a second lens, a first lens driving module and a second lens driving module, and the auto-focus system comprising: a contrast value calculation module, configured for calculating contrast values of images captured by the first lens and the second lens; a focus control module, configured for generating a first set of a near position and a distant position, respectively controlling the first lens driving module and the second lens driving module to drive the first lens and the second lens to move to the near position and the distant position of the first set, and then controlling the contrast value calculation module to calculate a first set of contrast values corresponding to the near position and the distant position of the first set, and then generating a second set of a near position and a distant position according to the larger one of the contrast values of the first set; wherein the near position or the distant position of the second set is positioned between the near position and the distant position of the previous set; wherein the focus control module repeats the above-mentioned process and generates K sets of the near position and the distant position, and K sets of the contrast values corresponding the K sets of the near position and the distant position, N is a positive integer larger than 2; wherein the focus control module according to the K sets of the contrast values, respectively controls the first lens driving module and the second lens driving module to drive movements of the first lens and the second lens to perform focusing.