Synchronous camera
AssigneeToshiba Teli Corporation
InventorJunji Kishi
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a low-pass filter operation circuit constitutes a serial interface, which enables communication conforming to the serial bus standard including IEEE 1394 & USB 3.0, together with a timer register, a packet receiving circuit, and a packet transmitting circuit. The low-pass filter operation circuit performs a correction of gradually increasing or decreasing an internal timer value counted by the timer register by a unit count value thereof, thereby converging the deviation. A timer operation circuit calculates a timer reference value, corresponding to the timing at which sync. should be done next, common to cameras, based on a timer value in the timer register, and a frame rate generated by CPU.
Claims5
A synchronous camera, which is one of a plurality of synchronous cameras connected to an external controller via a serial bus, the synchronous camera being synchronously controlled in accordance with a frame rate set by the controller based on operating conditions of the synchronous camera including shutter speed and image size, the synchronous camera comprising:
- a receiver configured to receive a packet to which a timer value is added, the packet being issued from the controller at regular intervals;
- a timer register configured to perform a count operation of an internal timer value corresponding to the timer value carried by the packet;
- a low-pass filter operation processor configured to compare the timer value carried by the packet with the internal timer value counted by the timer register, and to correct the internal timer value so that it becomes close to, or matches, the timer value carried by the packet, by reducing or increasing the internal timer value based on a deviation between the timer value carried by the packet and the internal timer value;
- an operator configured to calculate a timer reference value common to the plurality of cameras connected to the serial bus, based on the internal timer value output from the timer register and the frame rate;
- and
- a transmitter configured to transmit a captured image frame to the controller via the serial bus, based on the timer reference value calculated by the operator.
Dependencies are inferred from the claim text.