US 11,681,321 B2
Image identification method applied to a joystick
Chao-Chien Huang, Hsin-Chu (TW); Yen-Hung Wang, Hsin-Chu (TW); Yi-Chung Chen, Hsin-Chu (TW); Hui-Hsuan Chen, Hsin-Chu (TW); and Yi-Hsien Ko, Hsin-Chu (TW)
Assigned to PixArt Imaging Inc., Hsin-Chu (TW)
Filed by PixArt Imaging Inc., Hsin-Chu (TW)
Filed on Nov. 9, 2021, as Appl. No. 17/521,883.
Application 17/521,883 is a continuation of application No. 17/069,824, filed on Oct. 13, 2020, granted, now 11,204,618.
Claims priority of provisional application 62/940,911, filed on Nov. 27, 2019.
Prior Publication US 2022/0066497 A1, Mar. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/033 (2013.01); G05G 9/047 (2006.01)
CPC G05G 9/047 (2013.01) [G05G 2009/04759 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An image identification method of eliminating accumulated error of a joystick, the joystick having an optical sensor adapted to analyze a movement of a plurality of identification dots disposed on a stick body, the image identification method comprising:
receiving a series of detection images;
setting a first identification dot of the plurality of identification dots as being a reference identification dot, wherein a position change of the reference identification dot in the series of detection images is used for identifying a control status of the joystick; and
setting a second identification dot of the plurality of identification dos as being the reference identification dot and cancelling the first identification dot as being the reference identification dot when the first identification dot is near a border of the detection image.