Digital camera having variable duration burst mode

• US 8,736,716 B2
• Filed: 04/06/2011
• Issued: 05/27/2014
• Est. Priority Date: 04/06/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Prentice, Wayne E.
• Primary Examiner(s): Berhan, Ahmed A
• Application Number:
  US13/080,734
• Publication Number:
  US 20120257071A1
• Time in Patent Office: 1,147 Days
• Field of Search: 348/220.1, 348/231.9, 348/362, 348/294, 348/305, 348/36, 348/48, 348/169, 348/208.14, 348/221.1
• US Class Current: 348/231.9
• CPC Class Codes: H04N 23/698 for achieving an enlarged field of view, e.g. panoramic image capture
• CPC Class Codes: H04N 5/2625 for obtaining an image which is composed of images from a temporal image sequence, e.g. for a stroboscopic effect sequence generated by event triggered capturing H04N7/188

Abstract

A digital camera for having a variable time duration burst capture mode, comprising: an image sensor; an optical system; a data processing system; a frame buffer memory; and a program memory. The program memory stores instructions including: specifying a first frame rate; initiating an image capture sequence; storing a sequence of digital images captured at the first frame rate in the frame buffer memory; determining whether the frame buffer memory has been filled to a predetermined capacity. If the frame buffer memory has been filled to the predetermined capacity, the program memory further includes instructions for specifying a second frame rate, wherein the second frame rate is lower than the first frame rate; designating a set of stored digital images that can be overwritten; and storing a sequence of digital images captured at the second frame rate in the frame buffer memory, overwriting the designated set of stored digital images.

Claims

1. A digital camera comprising:

an image sensor for capturing a digital image;

an optical system for forming an image of a scene onto the image sensor;

a data processing system;

a frame buffer memory for temporarily storing captured digital images; and

a program memory communicatively connected to the data processing system and storing instructions configured to cause the data processing system to implement a method for capturing a sequence of digital images in a variable time duration burst capture mode, wherein the method includes;

specifying a first frame rate;

initiating an image capture sequence;

storing a first plurality of digital images captured at the first frame rate in the frame buffer memory;

determining whether the frame buffer memory has been filled to a predetermined capacity, and if so;

specifying a second frame rate, wherein the second frame rate is lower than the first frame rate;

identifying one or more of the first plurality of digital images as a first set of digital images that can be overwritten;

storing a second plurality of digital images captured at the second frame rate in the frame buffer memory, overwriting one or more of the identified first set of digital images; and

numbering the first plurality of digital images stored in the frame buffer and/or the second plurality of digital images stored in the frame buffer in response to the overwriting.

2. The digital camera of claim 1 wherein the image capture sequence is initiated by pressing an image capture button, and wherein the image capture sequence is terminated when the image capture button is released.

3. The digital camera of claim 1 wherein the image capture sequence is terminated after a maximum time duration.

4. The digital camera of claim 1 wherein the instructions to implement the method for capturing a sequence of digital images in the variable time duration burst capture mode further include processing one or more of the sequence of digital images using one or more image processing operations to form processed digital images.

5. The digital camera of claim 1 wherein the instructions to implement the method for capturing a sequence of digital images in the variable time duration burst capture mode further include storing each of one or more of the sequence of digital images in an image memory as individual image files.

6. The digital camera of claim 1 wherein the instructions to implement the method for capturing a sequence of digital images in the variable time duration burst capture mode further include:

combining a plurality of the sequence of digital images to form a composite digital image; and

storing the composite digital image in an image memory.

7. The digital camera of claim 6 wherein the composite digital image comprises an image formed by combining foreground objects from a plurality of the sequence of digital images onto a common image background.

8. The digital camera of claim 6 wherein the composite digital image comprises a panoramic image.

9. The digital camera of claim 1 wherein the instructions to implement the method for capturing a sequence of digital images in the variable time duration burst capture mode further include combining two or more images from the sequence of digital images to form a video sequence.

10. The digital camera of claim 1 wherein the first frame rate is an integer multiple of the second frame rate.

11. The digital camera of claim 10 wherein any stored digital image having a capture time not corresponding to the second frame rate are identified as a member of the first set of digital images that can be overwritten.

12. The digital camera of claim 10 wherein:

the first frame rate is double the second frame rate;

the first plurality of digital images comprise even-numbered and odd-numbered digital images; and

one of the even-numbered digital images and one of the odd-numbered digital images are identified as members of the first set of digital images that can be overwritten.

13. The digital camera of claim 1 wherein the instructions to implement the method for capturing a sequence of digital images in the variable time duration burst capture mode further include:

determining whether the frame buffer memory has been filled to the predetermined capacity while digital images are being captured at the second frame rate, and if so;

specifying a third frame rate;

identifying one or more of the digital images comprising the sequence of digital images as a second set of images that can be overwritten; and

storing a third plurality of digital images captured at the third frame rate in the frame buffer memory, overwriting at least one of the identified second set of digital images.

14. A method for capturing an image sequence having a variable time duration for storage in a frame buffer memory having a predetermined capacity, comprising:

specifying a first frame rate;

initiating an image capture sequence;

capturing a first plurality of digital images at the first frame rate;

storing the first plurality of digital images in the frame buffer memory;

determining whether the frame buffer memory has been filled to a predetermined capacity, and if so;

specifying a second frame rate, wherein the second frame rate is lower than the first frame rate;

identifying one or more of the first plurality of digital images as a first set of digital images that can be overwritten;

capturing a second plurality of digital images at the second frame rate;

storing the second plurality of digital images in the frame buffer memory, overwriting one or more of the identified first set of digital images; and

numbering the first plurality of digital images stored in the frame buffer and/or the second plurality of digital images stored in the frame buffer in response to the overwriting.

15. A non-transitory program storage device comprising instructions stored thereon to cause one or more processors to:

set a first image capture frame rate;

initiate an image capture sequence;

capture a first plurality of digital images at the first frame rate;

store the first plurality of digital images in a frame buffer memory;

determine whether the frame buffer memory has been filled to a predetermined capacity, and if so;

specify a second frame rate, wherein the second frame rate is lower than the first frame rate;

identify one or more of the first plurality of digital images as a first set of digital images that can be overwritten;

capture a second plurality of digital images at the second frame rate;

store the second plurality of digital images in the frame buffer memory, overwriting one or more digital images of the identified first set of digital images; and

number the first plurality of digital images stored in the frame buffer memory and/or the second plurality of digital images stored in the frame buffer memory in response to the overwriting.

16. The non-transitory program storage device of claim 15, further comprising instructions to cause the one or more processors to:

combine one or more of the digital images in the frame buffer memory to form a composite digital image; and

store the composite digital image in a memory.

17. The non-transitory program storage device of claim 16, further comprising instructions to cause the one or more processors to combine a plurality of digital images in the frame buffer memory to form a video sequence.

18. The non-transitory program storage device of claim 15, wherein the first image capture frame rate is an integer multiple of the second image capture frame rate.

19. The non-transitory program storage device of claim 15, wherein any digital image stored in the memory having an image capture time not corresponding to the second image capture frame rate are identified as a member of the first set of digital images that can be overwritten.