Abstract: A video doorbell system comprising a video doorbell device, which comprises a chime trigger device, a first battery, an AC power receiving interface, an AC to DC circuit, a charging circuit, a DC power receiving interface and an image capture circuit. The first battery provides an internal DC voltage. The AC power receiving interface receives an AC voltage. The AC to DC circuit converts the AC voltage to a second DC voltage. The charging circuit drains the second DC voltage to charge the first battery. The DC power receiving interface receives a first DC voltage. The image capture circuit selectively drains the internal DC voltage, or the first DC voltage to operate.

Abstract: A video doorbell system comprising a video doorbell device, which comprises a chime trigger device, a first battery, an AC power receiving interface, an AC to DC circuit, a charging circuit, a DC power receiving interface and an image capture circuit. The first battery provides an internal DC voltage. The AC power receiving interface receives an AC voltage. The AC to DC circuit converts the AC voltage to a second DC voltage. The charging circuit drains the second DC voltage to charge the first battery. The DC power receiving interface receives a first DC voltage. The image capture circuit selectively drains the internal DC voltage, or the first DC voltage to operate.

Abstract: A doorbell device is provided. The doorbell device includes a first camera unit, a second camera unit, a doorbell button, and a processing unit. The first camera unit includes a first camera lens and a first image sensor, generating a first video. The second camera unit includes a second camera lens and a second image sensor, generating a second video. The processing unit selectively activates one of the first camera unit and the second camera unit according to at least one of the first video, the second video, and a state of the doorbell button.

Abstract: A motion detection method is provided. The method includes steps of: recording an input video having a plurality of windows of interest (WOIs), extracting a reference frame from the input video in every reference updating cycle, extracting a target frame from the input video and determining whether an event occurs in each of the WOIs by comparing the target frame with the reference frame in every checking cycle, and comparing the number of WOIs in which the event occurs in every observation cycle with a threshold to determine whether the input video contains a motion during the observation cycle.

Abstract: A motion detection method is provided. The method includes steps of: recording an input video, extracting a reference frame from the input video in every reference updating cycle, extracting a target frame from the input video and determining whether an event occurs by comparing the target frame with the reference frame in every checking cycle, and comparing the number of events accumulated in every observation cycle with a threshold to determine whether the input video contains a motion during the observation cycle.

Abstract: A doorbell device is provided. The doorbell device includes a first camera unit, a second camera unit, a doorbell button, and a processing unit. The first camera unit includes a first camera lens and a first image sensor, generating a first video. The second camera unit includes a second camera lens and a second image sensor, generating a second video. The processing unit selectively activates one of the first camera unit and the second camera unit according to at least one of the first video, the second video, and a state of the doorbell button.

Abstract: A motion detection method is provided. The method includes steps of: recording an input video, extracting a reference frame from the input video in every reference updating cycle, extracting a target frame from the input video and determining whether an event occurs by comparing the target frame with the reference frame in every checking cycle, and comparing the number of events accumulated in every observation cycle with a threshold to determine whether the input video contains a motion during the observation cycle.

Abstract: A motion detection method is provided. The method includes steps of: recording an input video having a plurality of windows of interest (WOIs), extracting a reference frame from the input video in every reference updating cycle, extracting a target frame from the input video and determining whether an event occurs in each of the WOIs by comparing the target frame with the reference frame in every checking cycle, and comparing the number of WOIs in which the event occurs in every observation cycle with a threshold to determine whether the input video contains a motion during the observation cycle.