Recording indicators

1. A camera, comprising:

an image sensor;

a lens barrel comprising one or more refractive lenses, wherein the lens barrel is configured to refract light received from an object field to form an image at an image plane at a surface of the image sensor; and

a recording indicator comprising one or more light sources;

wherein the image sensor is configured to capture video frames during integration periods; and

wherein the recording indicator is configured to emit pulses of visible light from an area aligned with an opening of the lens barrel towards the object field during non-integration periods between the integration periods, wherein through the opening the lens barrel receives the light from the object field to form the image at the image plane at the surface of the image sensor.

2. The camera as recited in claim 1 , wherein the visible light emitted by the recording indicator covers a field of view of the camera.

3. The camera as recited in claim 1 , wherein the recording indicator is activated when the camera is in recording mode and deactivated when the camera is not in recording mode.

4. The camera as recited in claim 1 , wherein the recording indicator includes two or more light-emitting diodes (LEDs) arranged around the image sensor that emit light pulses during the non-integration periods, wherein the lens elements in the lens barrel refract the emitted light pulses through an aperture stop in the lens barrel to provide visible light that covers a field of view of the camera.

5. The camera as recited in claim 1 , wherein the recording indicator includes two or more light-emitting diodes (LEDs) located between the lens barrel and the image sensor that emit light pulses towards the image sensor during the non-integration periods, wherein the light pulses are reflected by a surface at or near the image sensor towards the lens barrel, and wherein the lens elements in the lens barrel refract the reflected light pulses through an aperture stop in the lens barrel to provide visible light that covers a field of view of the camera.

6. The camera as recited in claim 1 , wherein the camera further includes a glass or plastic element located on an image side of an aperture stop in the lens barrel, wherein the recording indicator includes two or more light-emitting diodes (LEDs) located at an outer edge of the glass or plastic element, wherein the LEDs emit light pulses into the outer edge of the glass or plastic element during non-integration periods, wherein the light pulses are directed by the glass or plastic element towards the aperture stop before exiting the glass or plastic element at the aperture stop, and wherein one or more lens elements on the object side of the aperture stop in the lens barrel refract the pulses of light emitted through the aperture stop to provide visible light that covers a field of view of the camera.

7. The camera as recited in claim 1 , further comprising:

an optical element located at an object side of the lens barrel, wherein the optical element includes:

a first surface facing the object field;

a second surface; and

a third surface facing the lens barrel; and

wherein the one or more light sources of the recording indicator face the second surface of the optical element, wherein the one or more light sources are configured to emit visible light through the second surface of the optical element, wherein the third surface of the optical element redirects the visible light received through the second surface through the first surface of the optical element towards the object field; and

wherein the light received from the object field passes through the first surface and the second surface of the optical element and into the lens barrel.

8. The camera as recited in claim 7 , wherein the optical element is a prism.

9. The camera as recited in claim 7 , wherein the optical element is one of the one or more refractive lenses in the lens barrel.

10. A system, comprising:

a camera comprising:

an image sensor;

a lens barrel comprising one or more refractive lenses, wherein the lens barrel is configured to refract light received from an object field to form an image at an image plane at a surface of the image sensor; and

a recording indicator comprising one or more light sources, wherein the recording indicator is activated when the camera is in recording mode and deactivated when the camera is not in recording mode; and

memory for storing video captured by the camera when the camera is in recording mode;

wherein the system is configured to capture and store video frames during integration periods when the camera is in recording mode; and

wherein the recording indicator is configured to emit pulses of visible light from an area aligned with an opening of the lens barrel towards the object field during non-integration periods between the integration periods when the camera is in recording mode, wherein through the opening the lens barrel receives the light from the object field to form the image at the image plane at the surface of the image sensor.

11. The system as recited in claim 10 , wherein the recording indicator includes two or more light-emitting diodes (LEDs) arranged around the image sensor that emit light pulses during the non-integration periods, wherein the lens elements in the lens barrel refract the emitted light pulses through an aperture stop in the lens barrel to provide visible light that covers a field of view of the camera.

12. The system as recited in claim 10 , wherein the recording indicator includes two or more light-emitting diodes (LEDs) located between the lens barrel and the image sensor that emit light pulses towards the image sensor during the non-integration periods, wherein the light pulses are reflected by a surface at or near the image sensor towards the lens barrel, and wherein the lens elements in the lens barrel refract the reflected light pulses through an aperture stop in the lens barrel to provide visible light that covers a field of view of the camera.

13. The system as recited in claim 10 , wherein the camera further includes a glass or plastic element located on an image side of an aperture stop in the lens barrel, wherein the recording indicator includes two or more light-emitting diodes (LEDs) located at an outer edge of the glass or plastic element, wherein the LEDs emit light pulses into the outer edge of the glass or plastic element during non-integration periods, wherein the light pulses are directed by the glass or plastic element towards the aperture stop before exiting the glass or plastic element at the aperture stop, and wherein one or more lens elements on the object side of the aperture stop in the lens barrel refract the pulses of light emitted through the aperture stop to provide visible light that covers a field of view of the camera.

14. The system as recited in claim 10 , further comprising:

an optical element located at an object side of the lens barrel of the camera, wherein the optical element includes:

a first surface facing the object field;

a second surface; and

a third surface facing the lens barrel; and

wherein the one or more light sources of the recording indicator face the second surface of the optical element, wherein the one or more light sources are configured to emit visible light through the second surface of the optical element, wherein the third surface of the optical element redirects the visible light received through the second surface through the first surface of the optical element towards the object field; and

wherein the light received from the object field passes through the first surface and the second surface of the optical element and into the lens barrel.

15. The system as recited in claim 10 , further comprising a device, wherein the camera and the memory are integrated in the device, and wherein the device includes one or more processors for processing video frames captured by the video camera.

16. The system as recited in claim 10 , further comprising:

a device; and

a modular accessory configured to physically or magnetically attach to the device;

wherein, when attached to the device, the modular accessory communicates with a controller of the device via a wired or wireless connection to enable recording of video captured by the camera to the memory.

17. The system as recited in claim 16 , wherein the camera and the memory integrated in the device, wherein the device includes one or more processors for processing video frames captured by the video camera.

18. The system as recited in claim 16 , wherein the camera is a component in the modular accessory.

19. The system as recited in claim 18 , wherein the modular accessory includes the memory for storing video captured by the camera when the camera is in recording mode and one or more processors for processing video frames captured by the video camera.

20. The system as recited in claim 16 , wherein the modular accessory includes smart authentication technology so that the modular accessory is uniquely paired to a particular device.