Patent ID: 9435646
Filing Date: 2016-09-06
CPC Classification: G01C,G06F,Y02D

Claim Text:
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.