公开(公告)号：US11301065B2

公开(公告)日：2022-04-12

申请号：US16804514

申请日：2020-02-28

Applicant: PIXART IMAGING INC.

Inventor： Keng-Yeen Lye ,  Kevin Len-Li Lim

IPC: G06F3/038 ,  G06F3/0354 ,  G01C21/20 ,  G06F1/04 ,  H03K21/08

Abstract: There is provided a frame rate adjusting method of a navigation device including: counting a frame period using a clock of a local oscillator of the navigation device; counting a polling period using the same clock; calculating a difference between the frame period and the polling period; adjusting a frame rate of the navigation device when the difference is smaller than a predetermined margin.

公开(公告)号：US11526221B2

公开(公告)日：2022-12-13

申请号：US17683691

申请日：2022-03-01

Applicant: PixArt Imaging Inc.

Inventor： Keng-Yeen Lye ,  Kevin Len-Li Lim

IPC: G06F3/038 ,  G06F3/0354 ,  G01C21/20 ,  G06F1/04 ,  H03K21/08

Abstract: There is provided a frame rate adjusting method of a navigation device including: counting a frame period using a clock of a local oscillator of the navigation device; counting a polling period using the same clock; calculating a difference between the frame period and the polling period; adjusting a frame rate of the navigation device when the difference is smaller than a predetermined margin.

公开(公告)号：US09383833B2

公开(公告)日：2016-07-05

申请号：US13859145

申请日：2013-04-09

Applicant: PixArt Imaging Inc.

Inventor： Keng-Yeen Lye ,  Keng-Yeam Chang

IPC: G06F3/0354 ,  G06F1/32

CPC classification number: G06F3/03543 ,  G06F1/3259 ,  Y02D10/155

Abstract: A navigation device includes an image sensor, a processing unit, a main clock circuit and an auxiliary clock circuit, wherein a clock frequency of the auxiliary clock circuit is much lower than that of the main clock circuit. The image sensor captures a predetermined number of image frames in a burst period. The processing unit is configured to calculate a displacement according to the image frames, to disable the main clock circuit after the predetermined number of image frames have been captured by the image sensor and to restart the main clock circuit with the auxiliary clock circuit before the end of the burst period.

Abstract translation: 导航装置包括图像传感器，处理单元，主时钟电路和辅助时钟电路，其中辅助时钟电路的时钟频率远低于主时钟电路的时钟频率。 图像传感器在突发周期中捕获预定数量的图像帧。 处理单元被配置为根据图像帧计算位移，以在由图像传感器捕获预定数量的图像帧之后禁用主时钟电路，并且在结束之前用辅助时钟电路重启主时钟电路 的爆发时期。