Sheet media stack imaging system

1. An imaging system comprising:

a sheet media stack disposed over a recording unit;

a radiation source configured to project radiation onto the sheet media stack; and

an imaging device that is stationary and fixed relative to the recording unit, the imaging device configured to receive a reflection of the radiation from at least a part of the sheet media stack and to determine, based on the reflection, at least one aspect of the sheet media stack.

2. The imaging system of claim 1 , wherein the imaging device is configured to determine, based on the reflection, a number of sheets in the sheet media stack.

3. The imaging system of claim 1 , wherein the imaging device comprises an image sensor configured to generate image data in response to the reflection.

4. The imaging system of claim 3 , wherein the image sensor is selected from a group consisting of a charge coupled device sensor and a complementary metal-oxide semiconductor sensor.

5. The imaging system of claim 3 , wherein the radiation source is configured to project the radiation onto a plurality of sheet media edges of the sheet media stack; and

wherein the imaging device further comprises at least one lens positioned along an optical path between the image sensor and the plurality of sheet media edges.

6. The imaging system of claim 3 , wherein the radiation source is configured to project the radiation onto a plurality of sheet media edges of the sheet media stack; and

wherein the imaging device is configured to determine a number of sheets in the sheet media stack by detecting the plurality of sheet media edges in the image data.

7. The imaging system of claim 6 , wherein the imaging device is configured to detect the plurality of sheet media edges in the image data by:

filtering the image data; and

applying a threshold to the filtered image data to detect peaks in the filtered image data.

8. The system of claim 1 , wherein the recording unit comprises a digital notepad; and

wherein the system is configured to communicate with the digital notepad.

9. The system of claim 1 , wherein the sheet media stack includes paper media or plastic media.

10. The system of claim 1 , wherein the radiation source is configured to emit light.

11. The system of claim 10 , wherein the radiation source includes a light emitting diode or a laser diode.

12. A method for imaging comprising:

using an radiation source to project radiation onto a sheet media stack disposed over a recording unit;

receiving a reflection of the radiation from at least a part of the sheet media stack using an imaging device that is stationary and fixed relative to the recording unit; and

determining, based on the reflection, at least one aspect of the sheet media stack.

13. The method of claim 12 , wherein the at least one aspect of the sheet media stack is a number of sheets in the sheet media stack.

14. The method of claim 12 , wherein the radiation is projected onto a plurality of sheet media edges of the sheet media stack.

15. The method of claim 14 , further comprising:

generating image data in response to the reflection of the radiation.

16. The method of claim 15 , wherein determining at least one aspect of the sheet media stack comprises:

detecting, within the image data, the plurality of sheet media edges of the sheet media stack.

17. The method of claim 15 , wherein detecting the plurality of sheet media edges comprises:

filtering the image data; and

applying a threshold to the filtered image data to detect peaks in the filtered image data.

18. The method of claim 12 , wherein the recording unit comprises a digital notepad; and

further comprising communicating with the digital notepad.

19. The method of claim 12 , wherein the radiation source is configured to emit light.

20. The method of claim 19 , wherein the radiation source includes a light emitting diode or a laser diode.