Method and apparatus for reading meters from a video image

• US 5,673,331 A
• Filed: 06/03/1995
• Issued: 09/30/1997
• Est. Priority Date: 06/03/1995
• Status: Expired due to Fees

• Current Assignee: United States Department of Energy (Government of the United States of America)
• Original Assignee: United States Department of Energy (Government of the United States of America)
• Inventors: Lewis, Trevor J., Ferguson, Jeffrey J.
• Primary Examiner(s): JOHNS, ANDREW W
• Application Number:
  US08/462,339
• Time in Patent Office: 850 Days
• Field of Search: 382/100, 382/209, 382/291, 340/870.02, 340/870.29, 340/688, 364/464.04, 348/160
• US Class Current: 382/100
• CPC Class Codes: G01D 4/002 Remote reading of utility meters
• CPC Class Codes: G06V 10/10 Image acquisition document image scanning and transmission H04N1/00; control of digital cameras H04N23/60
• CPC Class Codes: G06V 2201/02 Recognising information on displays, dials, clocks
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

A method and system to enable acquisition of data about an environment from one or more meters using video images. One or more meters are imaged by a video camera and the video signal is digitized. Then, each region of the digital image which corresponds to the indicator of the meter is calibrated and the video signal is analyzed to determine the value indicated by each meter indicator. Finally, from the value indicated by each meter indicator in the calibrated region, a meter reading is generated. The method and system offer the advantages of automatic data collection in a relatively non-intrusive manner without making any complicated or expensive electronic connections, and without requiring intensive manpower.

Claims

1. A system for acquiring data about an environment from at least one meter which employs an indicator that changes in response to fluctuations of at least one measurable parameter of the environment, said system comprising:

a) camera means positioned relative to at least one meter including at least one indicator, for generating a video signal of said at least one meter;

b) means for associating a time reference signal with said video signal;

c) data interface means for digitizing the video signal generated by said camera means;

d) calibration means for calibrating each region of the digitized video signal which corresponds to the indicator of the at least one meter;

e) analysis means for determining the value indicated by said indicator; and

f) output means for generating a meter reading from the value indicated by said meter indicator as determined by said analysis means.

2. A system for data acquisition as claimed in claim 1 which further comprises a storage means for storing each meter reading generated by said output means.

3. A system for data acquisition as claimed in claim 1 wherein said camera means generates at least one video signal of at least two different meters, said system further comprising means for synchronizing the meter readings from said output means on the basis of the time reference signal.

4. A system for data acquisition as claimed in claim 3 which further comprises means for generating an interpretation of at least one condition of the environment from at least two meter readings obtained from said output means.

5. A system as claimed in claim 1 wherein said calibration means comprises:

a) input means for receiving data regarding the calibration of the at least one meter;

b) means for defining each region of the video signal which corresponds to the indicator of the at least one meter; and

c) processing means for calibrating each defined region of the video signal on the basis of the inputted data received by said input means.

6. A system as claimed in claim 5 wherein the at least one meter employs a radial pointer which sweeps a sweep area and the calibration means defines an annular region of the video signal which corresponds to the pointer sweep area.

7. A system as claimed in claim 5 wherein the at least one meter employs a digital readout and the calibration means defines the region of the video signal which corresponds to the digital readout.

8. A method of acquiring data about an environment from at least one meter which employs an indicator that varies in response to fluctuations of at least one measurable parameter of the environment, said method comprising the steps of:

a) positioning a video camera such that it generates a video signal of at least one meter which includes at least one indicator;

b) associating a time reference signal with the video signal;

c) converting the video signal to a digital representation;

d) retaining the time reference signal in association with the digital representation of the video signal;

e) calibrating at least one region of the digital representation which corresponds to the indicator of the at least one meter;

f) determining the value represented by the at least one meter indicator by analysis of the at least one calibrated region; and

g) generating at least one meter reading on the basis of the value represented by the at least one meter indicator.

9. A method in accordance with claim 8 further comprising the step of storing the at least one meter reading.

10. A method in accordance with claim 8 wherein the method generates meter readings from at least two meters by employing at least one video camera to generate at least one video signal and further comprising a means for synchronizing the meter readings on the basis of the time reference signal associated with the digital representation of the at least one video signal.

11. A method in accordance with claim 10 further comprising the step of generating at least one interpretation of one or more conditions of the environment from the at least two synchronized meter readings.

12. A method in accordance with claim 8 wherein at least one meter employs a radial pointer which is fixed to a central pivot point and which sweeps a calibrated scale in response to fluctuations of a measurable parameter.

13. A method in accordance with claim 8 wherein said calibration step comprises the steps of:

a) inputting certain parameters for the at least one meter regarding the location of the region of the digital representation which corresponds to the indicator of the at least one meter, the physical characteristics of the representation of at least one meter indicator; and

the scale for the region of the digital representation corresponding to the indicator of at least one meter;

b) processing the inputted parameters to locate the region of the digital representation corresponding to the at least one meter;

c) creating a template of the at least one meter indicator; and

d) associating a meter reading with at least one meter indicator relative to the at least one corresponding calibrated region.

14. A method in accordance with claim 8 wherein the at least one meter employs a digital readout and the calibration step defines the region of the video signal which corresponds to the digital readout.