Fault detection and method of detecting faults in digital imaging systems

Patent metadata

Field	Value
Publication number	US-9525865-B2
Application number	US-201414521751-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	Oct 23, 2014
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A method of analyzing a digital camera includes generating first image data using an image sensor in the camera. A first analysis is performed on at least one portion of the first image data. Second image data is generated using the image sensor and a second analysis is performed on the at least one portion of the second image data. The results of the first analysis are compared to the results of the second analysis. A signal indicating a fault with the digital camera is generated in response to the first analysis differing from the second analysis by a predetermined amount.

First claim

What is claimed is:

1. A method of analyzing a digital camera, the digital camera comprising an image sensor having a plurality of pixels that generate image data, the method comprising:
generating first image data using the image sensor;
performing a first analysis on at least one portion of the first image data;
generating second image data using the image sensor;
performing a second analysis on the at least one portion of the second image data;
comparing results of the first analysis to results of the second analysis;
generating a first signal indicating a first fault with the digital camera in response to the first analysis differing from the second analysis by a predetermined amount;
monitoring control data transmitted to the image sensor; and
generating a second signal indicating a second fault with the digital camera in response to the data transmitted to the image sensor not corresponding to data to correct at least one error between an image represented by the first image data and an image represented by the second image data.

2. The method of claim 1 wherein:
the at least one portion of the first image data corresponds to intensity of light incident to at least one pixel located on the image sensor;
performing a first analysis comprises analyzing the first image data corresponding to the intensity of light on the at least one pixel;
performing a second analysis comprises analyzing the second image data corresponding to the intensity of light on the at least one pixel;
generating a first signal comprises generating a signal indicating a fault in response to the result of the first analysis being substantially the same as the result of the second analysis.

3. The method of claim 1 , wherein:
the at least one portion of the first image data corresponds to intensity of light incident to at least one pixel located on the image sensor;
the at least one portion of the second image data corresponds to intensity of light incident to the at least one pixel located on the image sensor;
the first image data and the second image data have maximum values;
performing a first analysis comprises determining if the at least one portion of the first image data is substantially the maximum value;
performing a second analysis comprises determining if the at least one portion of the second image data is substantially the maximum value; and
wherein the generating a first signal comprises generating a signal indicating a fault in response to the at least one portion of the first image data being substantially at the maximum value and the at least one portion of the second image data being substantially at the maximum value.

4. The method of claim 1 , wherein:
the at least one portion of the first image data corresponds to intensity of light incident to at least one pixel located on the image sensor;
the at least one portion of the second image data corresponds to intensity of light incident to the at least one pixel located on the image sensor;
the first image data and the second image data have minimum values;
performing a first analysis comprises determining if the at least one portion of the first image data is substantially the minimum value;
performing a second analysis comprises determining if the at least one portion of the second image data is substantially the minimum value; and
wherein the generating a first signal comprises generating a signal indicating a fault in response to the at least one portion of the first image data being substantially at the minimum value and the at least one portion of the second image data being substantially at the minimum value.

5. The method of claim 1 , wherein the camera further comprises a light source; wherein light emitted by the light source is incident to the image sensor; wherein generating the first image data comprises generating the first image data with the light source illuminated; and wherein generating the second image data comprises generating the second image data with the light source illuminated.

6. The method of claim 5 , wherein the first image data and the second image data represent color of the light source.

7. The method of claim 5 , wherein the camera further comprises an iris for controlling amount of external light that is incident on the image sensor, and wherein generating the first and second image data further comprises closing the iris.

8. The method of claim 1 , wherein the camera further comprises an iris for controlling amount of external light that is incident on the image sensor, and wherein generating the first and second image data further comprises closing the iris.

9. The method of claim 1 , wherein:
performing a first analysis comprises calculating an average pixel value from the first image data;
performing a second analysis comprises calculating an average pixel value from the second image data; and
generating a first signal indicating a first fault comprises generating a signal indicating a fault with the digital camera in response to the average pixel value from the first image data being within a predetermined amount of the average pixel value from the second image data.

10. The method of claim 1 , wherein:
performing a first analysis comprises calculating an average pixel value from the first image data;
performing a second analysis comprises calculating an average pixel value from the second image data; and
generating a first signal indicating a fault comprises generating a signal indicating a fault with the digital camera in response to difference of the average pixel value from the first image data and the average pixel value from the second image data being greater than a predetermined amount.

11. The method of claim 1 , wherein:
performing a first analysis comprises calculating a first dynamic range of the image sensor;
performing a second analysis comprises calculating a second dynamic range of the image sensor; and
generating a first signal indicating a fault comprises generating a signal indicating a fault with the digital camera in response to difference between the first dynamic range and the second dynamic range being greater than a predetermined amount.

12. The method of claim 1 , wherein the first image data is generated substantially near a time of manufacture of the camera.

13. The method of claim 1 , wherein
the first image data is image data of a first plurality of image frames, and
the second image data is image data of a second plurality of image frames.

14. The method of claim 1 , wherein the control data is one or more of
a gain of the image sensor, and
an exposure time of the image sensor.

15. A method of analyzing a digital camera, the digital camera comprising an image sensor having a plurality of pixels that generate image data, the method comprising:
generating first image data from a first plurality of image frames using the image sensor;
performing a first analysis on at least one portion of the first image data;
generating second image data from a second plurality of image frames using the image sensor;
performing a second analysis on the at least one portion of the second image data;
comparing results of the first analysis to results of the second analysis;
determining a rate of change of image data between the first analysis and the second analysis; and
generating a signal indicating a fault with the digital camera in response to the first analysis differing from the second analysis by a predetermined amount.

16. The method of claim 15 , wherein the generating a signal comprises generating a signal indicating a timeframe f

Assignees

• Texas Instruments Inc

Inventors

• Sagar Rajat

Classifications

• H04N23/64

  Computer-aided capture of images, e.g. transfer from script file into camera, check of taken image quality, advice or proposal for image composition or decision on when to take image · CPC title

• H04N23/75

  by influencing optical camera components · CPC title

• H04N5/23222

  Electricity · mapped topic

• H04N5/238

  Electricity · mapped topic

• H04N17/002 Primary

  for television cameras · CPC title