Displacement detection device and operating method thereof

摘要

There is provided a displacement detection device including an image sensor, a light source, a light control unit and a processing unit. The image sensor captures image frames at a sampling frequency. The light source provides, in a speed mode, light for the image sensor in capturing the image frames. The light control unit controls the light source with the speed mode to turn on at a lighting frequency or to turn off serially. The processing unit calculates a displacement according to the image frames captured when the light source turns on to be served as an estimated displacement for an interval during which the light source turns off. There is further provided an operating method of a displacement detection device.

主权项

1. A displacement detection device, comprising:
a housing; an image sensor disposed inside the housing and configured to capture image frames at a sampling frequency; a light source disposed inside the housing and configured to provide, in at least one speed mode, light for the image sensor in capturing the image frames; a light control unit coupled to the light source and configured to control the light source with the speed mode to turn on corresponding to N successive image frames and next turn off corresponding to M successive image frames where in N and M are integers; a processing unit configured to calculate a displacement according to the image frames captured when the light source turns on to be served as an estimated displacement for an interval during which the light source turns off; and a transmission interface configured to output the displacement and the estimated displacement at a report rate, wherein (M+N) is smaller than or equal to a quotient calculated by dividing a frame rate of the light source by the report rate.