Enhanced video capture in adverse lighting conditions

1. A method of capturing a video frame using an electronic device, comprising:

capturing a first sub-frame using ambient light;

capturing a second sub-frame using ambient light and a light source under control of the electronic device; and

generating a primary frame based on a combination of the first sub-frame and the second sub-frame, said generating including

comparing, on a pixel-by-pixel basis, pixels of the first sub-frame with corresponding pixels of the second sub-frame;

for each comparison, flagging one of a pixel of the first sub-frame or a pixel of the second sub-frame that satisfies a predefined characteristic; and

using the pixels flagged in the first sub-frame and the pixels flagged in the second sub-frame to generate the primary frame.

2. The method according to claim 1 , wherein generating includes using data from both the first sub-frame and the second sub-frame to generate the primary frame.

3. The method according to claim 1 , where the predefined characteristic comprises a highest luminance level.

4. The method according to claim 1 , wherein the predefined characteristic comprises a luminance level or a chrominance level.

5. The method according to claim 1 , further comprising prior to the generating step synchronizing the second sub-frame with the first sub-frame.

6. The method according to claim 5 , wherein synchronizing comprises detecting motion of an object captured in the second sub-frame relative to the object captured in the first sub-frame, and modifying the second sub-frame to compensate for the detected motion.

7. The method according to claim 1 , wherein capturing the second sub-frame comprises pulsing a light source of the electronic device.

8. The method according to claim 1 , further comprising repeating the steps of claim 1 for each successive primary frame.

9. An electronic device, comprising:

a camera;

a light source; and

a control circuit operative to generate a video, the control circuit configured to

capture a first sub-frame using ambient light,

capture a second sub-frame using ambient light and the light source of the electronic device, and

generate a primary frame based on a combination of the first sub-frame and the second sub-frame, wherein to generate the primary frame the control circuit is configured to

compare, on a pixel-by-pixel basis, pixels of the first sub-frame with corresponding pixels of the second sub-frame;

for each comparison, flag one of a pixel of the first sub-frame or a pixel of the second sub-frame that satisfies a predefined characteristic; and

use the pixels flagged in the first sub-frame and the pixels flagged in the second sub-frame to generate the primary frame.

10. The electronic device according to claim 9 , wherein the electronic device comprises one of a camera, a mobile phone, a personal data assistance, a tablet computer, or a laptop computer.

11. The electronic device according to claim 9 , wherein the predefined characteristic comprises a highest luminance level.

12. The electronic device according to claim 9 , wherein the predefined characteristic comprises one of the highest luminance level or the highest chrominance level.

13. The electronic device according to claim 9 , wherein the control circuit is configured to synchronize the second sub-frame with the first sub-frame prior to performing the comparison.

14. The electronic device according to claim 13 , wherein the control circuit is configured to synchronize the second sub-frame to the first sub frame by detecting motion of an object captured in the second sub-frame relative to the object captured in the first sub-frame, and modify the second sub-frame to compensate for the detected motion.

15. The electronic device according to claim 9 , wherein the control circuit is configured to pulse the light source at a prescribed frequency.

16. The electronic device according to claim 9 , wherein the control circuit is configured to generate a video file from a plurality of primary frames.