Method of determining PSF using multiple instances of a nominally similar scene

• US 8,494,299 B2
• Filed: 02/08/2010
• Issued: 07/23/2013
• Est. Priority Date: 11/10/2004
• Status: Expired due to Fees

• Current Assignee: FotoNation Limited (Adeia Inc.)
• Original Assignee: DigitalOptics Corporation Europe Limited (Adeia Inc.)
• Inventors: Steinberg, Eran, Corcoran, Peter, Prilutsky, Yury
• Primary Examiner(s): Chu, Randolph I
• Assistant Examiner(s): BLOOM, NATHAN J
• Application Number:
  US12/702,092
• Publication Number:
  US 20100201826A1
• Time in Patent Office: 1,261 Days
• Field of Search: 382/107, 382/254, 382/294, 382/299, 348/208.99, 348/208.1, 348/208.4, 348/208.14, 348/208.16
• US Class Current: 382/255
• CPC Class Codes: G06T 2207/20201 Motion blur correction
• CPC Class Codes: G06T 5/50 using two or more images, e.g. averaging or subtraction
• CPC Class Codes: G06T 5/73 Deblurring; Sharpening
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/682 Vibration or motion blur correction

Abstract

A digital image acquisition system includes a portable apparatus for capturing digital images and a digital processing component for detecting, analyzing and informing the photographer regarding motion blur, and for reducing camera motion blur in an image captured by the apparatus. The digital processing component operates by comparing the image with at least one other image, for example a preview image, of nominally the same scene taken outside the exposure period of the main image. In one embodiment the digital processing component identifies at least one feature in a single preview image which is relatively less blurred than the corresponding feature in the main image, calculates a point spread function (PSF) in respect of such feature, and de-convolves the main image using the PSF. In another embodiment, the digital processing component calculates a trajectory of at least one feature in a plurality of preview images, extrapolates such feature on to the main image, calculates a PSF in respect of the feature, and de-convolves the main image using the PSF. In another embodiment the digital processing unit after determining the degree of blur notifies the photographer of the existing blur or automatically invokes consecutive captures.

Claims

1. A portable digital image camera-enabled device, comprising

an image capture component for capturing digital images;

and

a digital processing component including a processor for determining a camera motion blur function in a captured digital image based on a comparison of at least two sets of image data acquired at different times;

a same sensor configured to acquire each of said at least two sets of image data, such that at least each pixel of a same portion of said same sensor captures at least a pixel of each of said at least two sets of image data, within a temporal range that includes times proximately before or after said exposure period, and such that the captured digital image and said at least one relatively low resolution reference image comprise approximately the same scene, and

wherein the digital processing component is configured to compare a first set of said sets of image data to a second set of said sets of image data, the second set being taken outside the exposure period of the first set, and

wherein the digital processing component is further arranged to determine to de-blur said captured digital image based on determining that the camera motion blur function indicates that sufficient blur exists; and

wherein deblurring of the captured digital image by the digital processing component includes calculating the camera motion blur function including a point spread function (PSF) and de-convolving the captured digital image using the point spread function (PSF) only when said sufficient blur comprising more than a non-zero threshold blur is determined to exist in said captured digital image.

2. A device according to claim 1, wherein at least one of the sets of image data that are compared comprises a preview image.

3. A device according to claim 1, wherein said digital processing component is arranged to align at least portions of the at least two image data sets that are compared.

4. A device according to claim 3, wherein the alignment is a global alignment on entire or substantially entire images.

5. A device according to claim 1, wherein said at least two image data sets comprise said captured image and a reference image taken outside the exposure period of said captured image.

6. A device according to claim 5, wherein said reference image is taken before said exposure period of said captured image.

7. A device according to claim 5, wherein the reference image comprises a preview image.

8. A device according to claim 5, wherein said digital processing component is arranged to align at least portions of the captured image and the reference image.

9. A device according to claim 1, wherein said motion blur function determining occurs in real-time relative to the image capture.

10. A portable digital camera-enabled device, comprising

an image capture component for capturing digital images;

a digital processing component including a processor for determining a camera motion blur function in a captured digital image based on a comparison of at least two sets of image data acquired at different times; and

a same sensor configured to acquire each of said at least two sets of image data, such that at least a same portion of said same sensor captures at least a pixel of each of said at least two sets of image data, within a temporal range that includes times proximately before or after said exposure period, and such that the captured digital image and said at least one relatively low resolution reference image comprise approximately the same scene, and

wherein said digital processing component is configured to use a low resolution reference image among said sets of image data as the image data sets that are compared, the low resolution reference image being taken outside the exposure period of the captured digital image, and

wherein said digital processing component is further configured to identify at least one characteristic of the reference image which is relatively less blurred than the corresponding characteristic of the captured image, and to calculate said blur function in respect of said characteristic; and

wherein the digital processing component is further arranged to de-blur said captured digital image based on determining that the camera motion blur function indicates that sufficient blur exists; and

wherein deblurring of the captured digital image by the digital processing component includes calculating the camera motion blur function including a point spread function (PSF) and de-convolving the captured digital image using the point spread function (PSF) only when said sufficient blur comprising more than a non-zero threshold blur is determined to exist in said captured digital image.

11. A device according to claim 10, wherein at least one of the sets of image data that are compared comprises a preview image.

12. A device according to claim 10, wherein said digital processing component is arranged to align at least portions of the at least two image data sets that are compared.

13. A device according to claim 12, wherein the alignment is a global alignment on entire or substantially entire images.

14. One or more non-transitory processor-readable media having code embedded therein for programming a processor to perform a method of deblurring a captured digital image, the method comprising:

determining a camera motion blur function in a captured digital image based on a comparison of at least two sets of image data acquired at different times;

acquiring with a same sensor each of said at least two sets of image data, such that at least each pixel of a same portion of said same sensor captures at least a pixel of each of said multiple sets of image data, and such that at least a portion of each of said at least two sets of image data are taken within a temporal range that includes times proximately before or after said exposure period, and such that the captured digital image and said at least one relatively low resolution reference image comprise approximately the same scene,

comparing a first set of said sets of image data to a second set of said sets of image data, the second set being taken outside the exposure period of the first set,

determining to de-blur said captured digital image based on determining that the camera motion blur function indicates that sufficient blur exists; and

deblurring the captured digital image including calculating the camera motion blur function including a point spread function (PSF) and de-convolving the captured digital image using the point spread function (PSF) only when said sufficient blur comprising more than a non-zero threshold blur is determined to exist in said captured digital image.

15. The one or more non-transitory processor-readable media of claim 14, wherein the method further comprises aligning at least portions of the captured image and the reference image.

16. The one or more non-transitory processor-readable media of claim 15, wherein the aligning comprises globally aligning entire or substantially entire images.

17. One or more non-transitory processor-readable media having code embedded therein for programming a processor to perform a method of deblurring a captured digital image, the method comprising:

determining a camera motion blur function in a captured digital image based on a comparison of at least two sets of image data acquired at different times;

acquiring with a same sensor each of said at least two sets of image data such that at least each pixel of a same portion of said same sensor captures at least a pixel of each of said multiple sets of image data, and such that at least a portion of each of said at least two sets of image data are taken within a temporal range that includes times proximately before or after said exposure period, and such that the captured digital image and said at least one relatively low resolution reference image comprise approximately the same scene,

selecting a low resolution reference image among said sets of image data for comparing the image data sets, the low resolution reference image being taken outside the exposure period of the captured digital image, and

identifying at least one characteristic of the reference image which is relatively less blurred than the corresponding characteristic of the captured image, and calculating said blur function in respect of said characteristic; and

determining to de-blur said captured digital image based on determining that the camera motion blur function indicates that sufficient blur exists; and

deblurring the captured digital image including calculating the camera motion blur function including a point spread function (PSF) and de-convolving the captured digital image using the point spread function (PSF) only when said sufficient blur comprising more than a non-zero threshold blur is determined to exist in said captured digital image.

18. The one or more non-transitory processor-readable media of claim 17, wherein the method further comprises aligning at least portions of the captured image and the reference image.

19. The one or more non-transitory processor-readable media of claim 18, wherein the aligning comprises globally aligning entire or substantially entire images.

20. One or more non-transitory processor-readable media having code embedded therein for programming a processor to perform a method of deblurring a captured digital image, the method comprising:

determining a camera motion blur function in a captured digital image based on a comparison of at least two sets of image data acquired at different times;

acquiring each of said at least two sets of image data, such that at least each pixel of a same portion of said same sensor captures at least a pixel of each of said multiple sets of image data, and such that at least a portion of each of said at least two sets of image data are taken within a temporal range that includes times proximately before or after said exposure period, and such that the captured digital image and said at least one relatively low resolution reference image comprise approximately the same scene,

selecting a low resolution reference image among said sets of image data for comparing the image data sets, the low resolution reference image being taken outside the exposure period of the captured digital image, and

calculating a trajectory of at least one characteristic in the reference images, including extrapolating such characteristic onto the captured image, and calculating said blur function in respect of said characteristic; and

determining to de-blur said captured digital image based upon determining that the camera motion blur function indicates that sufficient blur exists; and

deblurring the captured digital image including calculating the camera motion blur function including a point spread function (PSF) and de-convolving the captured digital image using the point spread function (PSF) only when said sufficient blur comprising more than a non-zero threshold blur is determined to exist in said captured digital image.

21. The one or more non-transitory processor-readable media of claim 20, wherein the method further comprises aligning at least portions of the captured image and the reference image.