Automatic meter reading
View Patent ↗A meter is read. An image on a face of the meter is captured. Optical character recognition of digits of a digital display on the face of the meter is performed. At least one stored template is used to perform the optical character recognition of digits.
1. A method for reading a meter comprising wheels that rotatably display digits, the method comprising:
capturing an image of a face of the meter; and,
performing optical character recognition using at least one template in order to recognize digits displayed on the wheels of the meter.
2. A method as in claim 1 wherein performing optical character recognition of digits includes inverting digits that are light into digits that are dark.
3. A method as in claim 1 wherein the at least one template comprises a long template for recognizing a combination of digits comprising a portion of a first digit on a first wheel and a portion of a second digit on a second wheel.
4. A method as in claim 3 wherein the long template is additionally used for recognizing an entire digit on a single wheel.
5. A method as in claim 1 wherein the at least one template comprises a plurality of templates, each of the plurality of templates including a single digit, and a long template with multiple digits, the long template being used to recognize digits in transition.
6. A method as in claim 1 additionally comprising:
transmitting results of the optical character recognition to a remote location.
7. A system for reading a meter comprising wheels that rotatably display digits, the system comprising:
a camera that captures an image of a face of the meter; and,
a processor that performs optical character recognition using at least one template to perform the optical character recognition of digits displayed on the wheels of the meter.
8. A system as in claim 7 wherein before performing optical character recognition of digits the processor inverts digits that are light into digits that are dark.
9. A system as in claim 7 wherein the at least one template comprises a long template for recognizing a combination of digits comprising a portion of a first digit on a first wheel and a portion of a second digit on a second wheel.
10. A system as in claim 9 wherein the long template is additionally used for recognizing an entire digit on a single wheel.
11. A system as in claim 7 wherein the at least one template comprises a plurality of templates, each of the plurality of templates including a single digit, and comprises a long template with multiple digits, the long template being used to recognize digits in transition.
12. A system as in claim 7 additionally comprising:
a transmitter that transmits results of the optical character recognition to a remote location.
13. A method as in claim 1 wherein using the at least one template comprises:
using the at least one template for performing a first optical character recognition of digits displayed on the wheels of the meter, the at least one template configured for recognizing light digits on dark backgrounds;
inverting the image for converting light to dark and dark to light; and
using the at least one template for performing a second optical character recognition on the inverted image, wherein performing the first and second optical character recognition provides optical character recognition of a combination of light digits on dark backgrounds and dark digits on light backgrounds.
14. A method as in claim 1 wherein using the at least one template comprises:
using a first template for performing a first optical character recognition of digits displayed on the wheels of the meter, the first template configured for recognizing light digits on dark backgrounds; and
using a second template for performing a second optical character recognition of digits displayed on the wheels of the meter, the second template configured for recognizing dark digits on light backgrounds, wherein using the first and second templates provides optical character recognition of a combination of light digits on dark backgrounds and dark digits on light backgrounds.
15. A method as in claim 1 wherein performing optical character recognition of digits on the wheels of the meter are carried out in at least one of a) a first order in which wheels are processed or b) a second order in which wheels are processed, wherein the first order is different than the second order.
16. A method for reading a meter, the method comprising:
capturing an image of at least a portion of a face of the meter;
determining from the image, the number of wheels present in the meter, wherein each wheel displays a digit of a digital readout of the meter; and
performing optical character recognition of a first portion of the digital readout comprising dark digits on a light background; and
performing optical character recognition of a second portion of the digital readout comprising light digits on a dark background.
17. A method as in claim 16 wherein performing optical character recognition of the first portion of the digital readout comprises using a first template; and performing optical character recognition of the second portion of the digital readout comprises using a second template that is different than the first template.
18. A method as in claim 17 wherein at least one of the first or the second templates is a long template for recognizing a combination of digits comprising a portion of a first digit on a first wheel and a portion of a second digit on a second wheel.
19. A method as in claim 16 wherein performing optical character recognition of the first portion of the digital readout comprises using a first template; wherein the second portion comprises an inverted image of the first portion, and performing optical character recognition of the second portion of the digital readout comprises using the first template upon the second portion.
20. A method as in claim 19 further comprising using a long template, wherein the long template is configured for recognizing a combination of digits that includes a portion of a first digit on a first wheel and a portion of a second digit on a second wheel.