Devices for usage of sunscreen lotions

1. A non-transient computer readable medium containing program instructions for causing a computer to perform a method, the method comprising:

instructing an image sensor to capture a first image data of a patch applied to the user's skin, the skin being unprotected against an ultraviolent (UV) spectrum of a radiation source, the patch having a predetermined reflection coefficient in the UV spectrum of a radiation source, the first image data including an area of the user's unprotected skin adjacent to the applied patch;

measuring a first reflectance from the patch based on the predetermined reflection coefficient;

determining a second reflectance from the unprotected skin adjacent to the applied patch based on the measured first reflectance;

instructing the image sensor to capture a second image data of the user's skin after application of a sunscreen on the user's unprotected skin, the second image data including an area of the user's skin with the applied sunscreen;

determining a third reflectance from the skin adjacent to the applied patch for the skin having the applied sunscreen based on the measured first reflectance; and

determining a time extending factor for the applied sunscreen based on the second and third reflectance.

2. The computer-readable medium of claim 1 , further comprising determining an exposure time for the unprotected skin.

3. The computer-readable medium of claim 2 , wherein the exposure time, T m , in seconds, for the unprotected skin is determined based on the following equation:

T

m

⁡

[

seconds

]

=

1836

⁢

[

J

.

m

-

2

]

∑

J

i

⁢

E

i

where the Standard MMD=459 J·m −2 at 296 nm and J i is spectral weighting factor.

4. The computer-readable medium of claim 2 , wherein subsequent to the comparing, the method further comprising calculating an exposure time for the user's skin with the applied sunscreen by multiplying the time T m by the time extending factor.

5. The computer-readable medium of claim 1 , wherein the capturing of the first and second image data is captured through a UV transmitting low-pass filter.

6. The computer-readable medium of claim 1 , further comprising saving at least the first image data with an associated date of capture.

7. The computer-readable medium of claim 1 , wherein the determining of the time extending factor for the applied sunscreen is a ratio of the second and third reflectance.

8. A device comprising:

a processor comprising hardware, the processor being configured to:

instruct an image sensor to capture a first image data of a patch applied to a user's skin, the skin being unprotected against an ultraviolent (UV) spectrum of a radiation source, the patch having a predetermined reflection coefficient in the UV spectrum of a radiation source, the first image data including an area of the user's unprotected skin adjacent to the applied patch;

measure a first reflectance from the patch based on the predetermined reflection coefficient;

determine a second reflectance from the unprotected skin adjacent to the applied patch based on the measured first reflectance;

instruct the image sensor to capture a second image data of the user's skin after application of a sunscreen on the user's unprotected skin, the second image data including an area of the user's skin with the applied sunscreen;

determine a third reflectance from the skin adjacent to the applied patch for the skin having the applied sunscreen based on the measured first reflectance; and

determine a time extending factor for the applied sunscreen based on the second and third reflectance.

9. The device of claim 8 , wherein the processor is further configured to determine an exposure time for the unprotected skin.

10. The device of claim 9 , wherein the exposure time, T m , in seconds, for the unprotected skin is determined based on the following equation:

T

m

⁡

[

seconds

]

=

1836

⁢

[

J

.

m

-

2

]

∑

J

i

⁢

E

i

where the Standard MMD=459 J·m −2 at 296 nm and J i is spectral weighting factor.

11. The device of claim 9 , wherein subsequent to the comparing, the processor is further configured to calculate an exposure time for the user's skin with the applied sunscreen by multiplying the time T m by the time extending factor.

12. The device of claim 8 , wherein the capturing of the first and second image data is captured through a UV transmitting low-pass filter.

13. The device of claim 8 , wherein the processor is further configured to save at least the first image data with an associated date of capture.

14. The device of claim 8 , wherein the determining of the time extending factor for the applied sunscreen is a ratio of the second and third reflectance.

15. The device of claim 8 , further comprising the image sensor.

16. The device of claim 9 , further comprising a display for displaying one or more of the time extending factor and exposure time to the user.

17. A cellular phone comprising:

an image sensor;

a display; and

a processor comprising hardware, the processor being configured to:

instruct the image sensor to capture a first image data of a patch applied to a user's skin, the skin being unprotected against an ultraviolent (UV) spectrum of a radiation source, the patch having a predetermined reflection coefficient in the UV spectrum of a radiation source, the first image data including an area of the user's unprotected skin adjacent to the applied patch;

measure a first reflectance from the patch based on the predetermined reflection coefficient;

determine a second reflectance from the unprotected skin adjacent to the applied patch based on the measured first reflectance;

instruct the image sensor to capture a second image data of the user's skin after application of a sunscreen on the user's unprotected skin, the second image data including an area of the user's skin with the applied sunscreen;

determine a third reflectance from the skin adjacent to the applied patch for the skin having the applied sunscreen based on the measured first reflectance; and

determine a time extending factor for the applied sunscreen based on the second and third reflectance.

18. The cellular phone of claim 17 , wherein the processor is further configured to determine an exposure time for the unprotected skin.

19. The cellular phone of claim 17 , further comprising a memory, wherein the processor is further configured to save at least the first image data with an associated date of capture in the memory.

20. The cellular phone of claim 18 , wherein the processor is further configured to display one or more of the time extending factor and exposure time on the display.