Imaging device analysis systems and imaging device analysis methods

• US 8,634,014 B2
• Filed: 02/08/2005
• Issued: 01/21/2014
• Est. Priority Date: 04/05/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Kohler, Timothy L., Stoecker, Steven D., DiCarlo, Jeffrey M., Gehman, Les, Dispoto, Gary J., Montgomery, Eric, Miller, Casey L.
• Primary Examiner(s): DIEP, TRUNG T
• Application Number:
  US11/054,210
• Publication Number:
  US 20050219363A1
• Time in Patent Office: 3,269 Days
• Field of Search: 348/222.1, 348/335, 348/187, 348/345, 348/362
• US Class Current: 348/335
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: H04N 1/401 Compensating positionally unequal response of the pick-up or reproducing head H04N1/403 takes precedence
• CPC Class Codes: H04N 1/484 with sequential colour illumination of the original
• CPC Class Codes: H04N 17/002 for television cameras

Abstract

Imaging device analysis systems and imaging device analysis methods are described. According to one embodiment, an imaging device analysis system includes a light source configured to output light for use in analyzing at least one imaging component of an imaging device, wherein the imaging device is configured to generate images responsive to received light, and processing circuitry coupled with the light source and configured to control the light source to optically communicate the light to the imaging device, wherein the processing circuitry is further configured to access image data generated by the imaging device responsive to the reception, by the imaging device, of the light from the light source and to process the image data to analyze an operational status of the at least one imaging component.

Claims

1. An imaging device analysis system comprising:

a light source that outputs light for use in analyzing at least one imaging component comprising a lens of an imaging device that generates images responsive to received light, wherein the light source outputs first light having a first wavelength characteristic at a first moment in time and outputs second light having a second wavelength characteristic different from the first wavelength characteristic at a second moment in time, and the light source outputs the second light as a plurality of light beams directed along different respective spatially separated beam paths; and

processing circuitry that is coupled with the light source and controls the light source to optically communicate the light to the imaging device and to lock a focus of the lens of the imaging device using the light of the first wavelength characteristic at the first moment in time, wherein the processing circuitry accesses image data generated by the imaging device in response to receipt of the light from the light source having the second wavelength characteristic at the second moment in time with the focus of the lens locked, the processing circuitry identifies in the image data areas corresponding to locations of an image sensor of the imaging device that received light of second wavelength characteristic, and the processing circuitry determines whether a chromatic aberration is present within the lens based on an analysis of the identified areas.

2. The system of claim 1 wherein the light source is configured to output the light comprising infrared light for use in testing at least one imaging component comprising the lens and an infrared cutoff filter configured to filter infrared light.

3. The system of claim 1 further comprising a mask that comprises a plurality of spatially separated apertures in a configuration matching a spatial arrangement of the plurality of light beams output by the light source, the mask being selectively moveable to a position intermediate the light source and the imaging device.

4. The system of claim 3 wherein the processing circuitry is configured to control movement of the mask with respect to the position.

5. The system of claim 1, wherein the processing circuitry is configured to process the image data generated at a plurality of pixel locations of the image sensor of the imaging device corresponding to the identified areas in the image data to determine the operational status comprising distortion of the at least one imaging component comprising the lens of the imaging device.

6. The system of claim 1 wherein individual ones of the light beams are outputted for a duration less than an exposure time of the imaging device, and the processing circuitry is configured to process the image data to determine the operational status comprising shutter speed of the at least one imaging component comprising a shutter of the imaging device.

7. The system of claim 1 wherein the processing circuitry is configured to determine the operational status of the at least one component comprising an image sensor, and to determine at least one correction factor for use in modification of image data generated using the image sensor.

8. The system of claim 1 wherein the processing circuitry is configured to process the image data comprising comparing a number of pixels of the image sensor which received the light having the second wavelength with respect to a threshold to determine whether the chromatic aberration is present.

9. An imaging device analysis method comprising:

fixing focus of a lens of an imaging device configured to generate images responsive to received light;

outputting a plurality of light beams directed along different respective spatially separated beam paths, wherein each light beam comprises light in each of multiple discrete wavelength ranges;

receiving the light beams using the imaging device after the fixing;

generating image data using the imaging device responsive to the receiving the light beam;

identifying in the image data areas corresponding to locations of an image sensor of the imaging device that received the light beams; and

determining whether a chromatic aberration of the lens of the imaging device is present based on an analysis of the identified areas, wherein for each of the identified areas of the imaging device the analysis comprises ascertaining different regions of the identified area that received light having different respective mixes of the discrete wavelength ranges of light.

10. The method of claim 9 wherein:

the fixing comprises outputting first light having a first wavelength characteristic and locking a focus of the lens of the imaging device using the light of the first wavelength characteristic; and

the outputting comprises outputting the plurality of light beams with a second wavelength characteristic different from the first wavelength characteristic.

11. The method of claim 9 further comprising:

providing a mask comprising a plurality of apertures;

passing the light beams through respective ones of the apertures; and

wherein the receiving comprises receiving after the passing.

12. The method of claim 9 wherein the receiving the light beams comprises receiving using an image sensor of the imaging device, and wherein the determining comprises:

identifying a number of pixel locations of the image sensor which received the light beams; and

comparing the number of pixel locations with respect to a threshold.

13. The method of claim 12 wherein the analyzing identifies that the chromatic aberration of the lens is present if the comparing determines that the number of pixel locations which received the light beam exceeds the threshold.

14. The method of claim 9 wherein the outputting the light beams comprises outputting light of a plurality of wavelengths and mixing the light of the plurality of wavelengths.

15. The method of claim 9 wherein the generating comprises generating using the imaging device with the focus of the lens of the imaging device the same as during the fixing.

16. The method of claim 9 wherein the fixing comprises fixing prior to the receiving, and the receiving and the generating comprise receiving and generating using the imaging device with the focus of the lens of the imaging device the same as during the fixing.

17. An imaging device analysis method comprising:

outputting a light beam for communication to an imaging device configured to generate images responsive to received light;

focusing the light beam using a lens of the imaging device;

after the focusing, receiving the light beam using an image sensor of the imaging device;

generating image data using the image sensor of the imaging device responsive to the receiving the light beam;

processing the image data corresponding to a plurality of pixel locations of the image sensor, wherein the processing comprises determining respective sizes of one or more areas of the image sensor illuminated by the light beam and ascertaining whether a chromatic aberration is present based on the one or more determined sizes; and

indicating results of the focusing by the lens using the processing.

18. The method of claim 17 wherein the outputting comprises outputting a plurality of light beams spatially separated from one another, and wherein the processing comprises processing the image data at the pixel locations spatially separated from one another and corresponding to spatial locations of the light beams.

19. The method of claim 17 wherein the light beams are spatially separated from others of the light beams along two dimensions within a field of view of the lens of the imaging device.

20. The method of claim 17 wherein the outputting comprises outputting a plurality of light beams and passing the light beams through a mask.

21. The method of claim 17 wherein the determining comprises identifying a number of pixel locations which received light of the light beam and the ascertaining comprises comparing the number of pixel locations with respect to a threshold.

22. The method of claim 21 wherein the indicating comprises indicating that the ability of the lens to focus is unacceptable if the number of pixel locations which received the light beam exceeds the threshold.

23. The method of claim 17 wherein the indicating comprises indicating the results of the focusing by the lens comprising information regarding an ability of the lens to focus the light beam.

24. The method of claim 17 wherein the indicating comprises indicating the results of the focusing by the lens comprising information regarding accuracy of the focusing of the light beam using the lens of the imaging device.

25. An imaging device analysis method comprising:

outputting a plurality of light beams for communication to an imaging device configured to generate images responsive to received light, wherein the outputting comprises outputting the plurality of light beams in a pattern that provides the light beams arranged in a plurality of straight lines;

accessing image data generated by the imaging device responsive to the light beams communicated to the imaging device;

processing the image data to identify in the image data areas corresponding to locations of an image sensor of the imaging device that received the light beams, wherein the processing comprises identifying a plurality of pixel locations of the imaging device which received the light beams, comparing the pixel locations to the pattern, and analyzing alignment of the pixel locations with respect to the straight lines; and

determining distortion of optics of the imaging device based on the analyzing of the identified areas.

26. The method of claim 25 wherein the pattern comprises the light beams arranged in a plurality of straight lines comprising rows and columns of a grid.

27. The method of claim 25 wherein the providing information comprises providing information regarding pin cushion distortion.

28. The method of claim 25 wherein the providing information comprises providing information regarding barrel distortion.

29. The method of claim 25 wherein the providing the information regarding distortion comprises indicating whether the lens has an acceptable amount of distortion or unacceptable amount of distortion.

30. The method of claim 25 wherein the providing the information regarding distortion comprises providing using the processing of the image data which is indicative of intensity of the light beams received by a plurality of pixels of the imaging device.

31. The method of claim 25 wherein the providing information comprises providing the information to indicate that the optics of the imaging device have unacceptable distortion as a result of the comparing.

32. The method of claim 31 wherein the providing information to indicate that the optics of the imaging device have unacceptable distortion comprises providing as a result of the comparing determining that a deviation of at least one of the pixel locations from the pattern exceeds a threshold.

33. The method of claim 25, wherein the plurality of light beams are outputted in a pattern that provides the light beams in a rectangular grid pattern of spaced-apart beam locations.