Breath alcohol ignition interlock system

1. An improved breath alcohol ignition interlock system of the type for use by a person and including a handpiece and an imaging device, the handpiece containing a breath alcohol tester and the imaging device being adapted to capture an image including the handpiece when a breath sample is delivered to the handpiece, the improvement comprising:

a sensor arrangement adapted to provide information from which an orientation and position of the handpiece can be calculated;

a computing functionality adapted to: generate a calculated orientation and position of the handpiece; and if a face appears in the image, precisely locate the features thereof

wherein the features of the face are located using the calculated orientation and position of the handpiece.

2. The system according to claim 1 , wherein the features of the face are further located using stored data associated with facial geometry.

3. The system according to claim 2 , wherein the features of the face are further located using stored data associated with the geometry of the face of the person.

4. The system according to claim 3 , wherein

if the handpiece appears in the image, precisely identify the location and orientation of the handpiece, using stored data associated with the geometry of the handpiece.

5. The system according to claim 3 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

6. The system according to claim 2 , wherein

if the handpiece appears in the image, precisely identify the location and orientation of the handpiece, using stored data associated with the geometry of the handpiece.

7. The system according to claim 6 , wherein the features of the face are located using the location and orientation of the handpiece as identified.

8. The system according to claim 7 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

9. The system according to claim 6 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

10. The system according to claim 2 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

11. The system according to claim 1 , wherein the sensor arrangement comprises an accelerometer and a gyroscope disposed interiorly of the handpiece.

12. The system according to claim 11 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

13. The system according to claim 1 , wherein

the handpiece includes a light which is selectively triggered by the system according to a pattern and can be perceived by the imaging device; and

the imaging device senses the light and compares the perceived light against the pattern for anti-circumvention purposes.

14. The system according to claim 13 , wherein the computing functionality senses the light using

stored data associated with the shape of the handpiece and the location of the light therein

and

the calculated orientation and location of the handpiece or the measured orientation and location of the handpiece.