Audio/video recording and communication devices with multiple cameras

1. An audio/video recording and communication device (A/V device), comprising:

a first camera having a first resolution;

a second camera having a second resolution, wherein the second resolution is higher than the first resolution;

a communication module;

a processor operatively connected to the first camera, the second camera, and the communication module; and

a memory storing a camera application comprising instructions that, when executed by the processor, cause the A/V device to:

maintain the first camera in a powered-on state;

record first video image data using the first camera;

maintain the second camera in a low-power or powered-off state;

power up the second camera based on an output signal from the first camera;

record second video image data using the second camera;

prepend at least a portion of the first video image data, captured before the second camera is powered up, to the second video image data to form combined video image data; and

transmit the combined video image data to a network device.

2. The A/V device of claim 1 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to store the first video image data recorded using the first camera in the memory.

3. The A/V device of claim 1 , wherein the memory comprises a rolling buffer.

4. The A/V device of claim 1 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to power up the second camera when the output signal from the first camera indicates that motion has been detected in a field of view of the first camera.

5. The A/V device of claim 1 , the network device being a client device.

6. The A/V device of claim 1 , the network device being a server.

7. The A/V device of claim 1 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to generate the output signal in response to detection of a person in a field of view of the first camera.

8. The A/V device of claim 1 , wherein a field of view of the first camera is at least partially coincident with a field of view of the second camera.

9. The A/V device of claim 1 , wherein the A/V device comprises a doorbell having a front button.

10. The A/V device of claim 7 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to differentiate motion caused by a person from motion caused by other objects by comparing a set of motion characteristics of a moving object with a dataset.

11. The A/V device of claim 10 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to detect an object region in the first video image data recorded using the first camera.

12. The A/V device of claim 11 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to extract at least one feature from the object region.

13. The A/V device of claim 12 , wherein the camera application comprises further instructions, that when executed by the processor, further cause the A/V device to compare the at least one feature with trained features in the dataset.

14. An audio/video recording and communication device (A/V device), comprising:

a first camera having a first resolution;

a second camera having a second resolution, wherein the second resolution is higher than the first resolution;

a processor operatively connected to the first camera, the second camera, and the communication module; and

memory storing computer readable instructions that, when executed by the processor, cause the A/V device to:

record first image data using the first camera;

detect motion using the first image data;

in response to detection of the motion:

power up the second camera and record second image data using the second camera; and

transition the first camera from a first power state to a second power state, the second power state consuming lower power than the first power state; and

after recording the second image data using the second camera:

power down the second camera, and

transition the first camera from the second power state to the first power state.

15. The A/V device of claim 14 , the instructions that detect the motion in the first image data comprising instructions that, when executed by the processor, cause the A/V device to compare successive frames recorded by the first camera.

16. The A/V device of claim 14 , the memory storing further computer readable instructions that, when executed by the processor, further cause the A/V device to detect a person in the first image data; wherein the instructions to power up the second camera are only executed when the person is detected.

17. The A/V device of claim 14 , a field of view of the first camera being at least partially overlapping with a field of view of the second camera.

18. The A/V device of claim 14 , the memory storing further computer readable instructions that, when executed by the processor, further cause the A/V device to prepend the first image data to the second image data to form combined image data, and store the combined image data.

19. The A/V device of claim 18 , the memory storing further computer readable instructions that, when executed by the processor, further cause the A/V device to transmit the combined image data to a network device.

20. The A/V device of claim 19 , the network device being a server.