Systems and method for skin analysis using electronic devices
There is a skin analysis device for attachment to an electronic device of a human user, the electronic device having at least one skin characteristic measurement device, the skin analysis device comprising an enclosure comprising an enclosure body, configured to be removably connected to the electronic device and one or more skin characteristic measurement assisters, connected to the enclosure and configured to assist one or more skin characteristic measurement devices take a skin characteristic sample of a skin characteristic of the human user.
1. A system for calibrating a moisture sensor, that can be pressed into contact with a test subject's skin at an unknown pressure when obtaining a moisture sensor reading, where pressure affects the moisture sensor reading, the system comprising:
the moisture sensor, configured to provide moisture sensor readings; and an electronic device comprising: a camera; and
a skin characteristic application stored on a tangible computer-readable medium such that the skin characteristic application, when executed by a processor, causes the electronic device to:
while the moisture sensor is pressed into contact with the test subject's skin at a first pressure, obtain a first picture of the test subject's skin and record i) a first focal length of the camera when the first picture was obtained and ii) a first moisture sensor reading of the test subject's skin from the moisture sensor;
while the moisture sensor is pressed into contact with the test subject's skin at a second pressure that is different from the first pressure, obtain a second picture of the test subject's skin and record i) a second focal length of the camera when the second picture was taken and ii) a second moisture sensor reading of the test subject's skin from the moisture sensor;
calculate a pressure-based moisture adjustment slope; and,
apply a pressure-based moisture adjustment factor based on the pressure-based moisture adjustment slope to a future moisture sensor reading, taken at a future focus distance, to arrive at an adjusted future moisture sensor reading.
2. The system of claim 1 wherein the skin characteristic application, when executed by a processor, is further configured to cause the electronic device to:
determine the pressure-based moisture adjustment slope using a first (x, y) coordinate where x is the first focal length and y is the first moisture sensor reading and a second (x, y) coordinate where x is the second focus distance and y is the second moisture sensor reading; and quantify an average focus distance from the first focus distance and the second focus distance.
3. The system of claim 2 wherein the applying further comprises:
solving a slope point form equation of a form Y−Y1=m(X−X1), where
Y is the adjusted future moisture sensor reading;
Y1 is the future moisture sensor reading; m is the pressure-based moisture adjustment slope;
X is the average focus distance; and
X1 is the future focus distance.
4. The system of claim 3 wherein the skin characteristic application is further configured to:
prompt a user to select a first focal point near a middle of a display of the electronic device that is previewing the first picture; and
accept a user input selecting the focal point as a trigger to take a picture.
5. The system of claim 1 wherein the test subject is a user of the electronic device.
6. The system of claim 1 wherein the second pressure is lighter than the first pressure.
7. The system of claim 6 wherein the skin characteristic application, when executed, is further configured to cause the electronic device to:
determine the pressure-based moisture adjustment slope using a first (x, y) coordinate where x is the first focal length and y is the first moisture sensor reading and a second (x, y) coordinate where x is the second focus distance and y is the second moisture sensor reading; and quantify an average focus distance from the first focus distance and the second focus distance.
8. The system of claim 7 wherein the applying further comprises:
solving a slope point form equation of a form Y−Y1=m(X−X1), where
Y is the adjusted future moisture sensor reading;
Y1 is the future moisture sensor reading;
m is the pressure-based moisture adjustment slope;
X is the average focus distance; and
X1 is the future focus distance.