Digital image processor for a digital camera

• US 8,466,978 B2
• Filed: 08/05/2010
• Issued: 06/18/2013
• Est. Priority Date: 05/29/1998
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Safai, Mohammad A.
• Primary Examiner(s): VU, NGOC YEN T
• Application Number:
  US12/851,028
• Publication Number:
  US 20100295964A1
• Time in Patent Office: 1,048 Days
• Field of Search: 348/207.99, 348/222.1
• US Class Current: 348/222.1
• CPC Class Codes: H04N 2209/046 Colour interpolation to calculate the missing colour values
• CPC Class Codes: H04N 23/617 Upgrading or updating of programs or applications for camera control
• CPC Class Codes: H04N 23/631 Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters
• CPC Class Codes: H04N 23/843 Demosaicing, e.g. interpolating colour pixel values
• CPC Class Codes: H04N 23/88 for colour balance, e.g. white-balance circuits or colour temperature control
• CPC Class Codes: H04N 25/00 Circuitry of solid-state image sensors [SSIS]; Control thereof
• CPC Class Codes: H04N 25/134 based on three different wavelength filter elements
• CPC Class Codes: H04N 25/67 applied to fixed-pattern noise, e.g. non-uniformity of response
• CPC Class Codes: H04N 25/745 Circuitry for generating timing or clock signals
• CPC Class Codes: H04N 5/765 Interface circuits between an apparatus for recording and another apparatus
• CPC Class Codes: H04N 5/772 the recording apparatus and the television camera being placed in the same enclosure
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 9/8047 using transform coding

Abstract

There is provided a digital image processor. An exemplary digital image processor comprises a pre-processor arranged to pre-process received digital images having a first resolution into a lower resolution to form pre-processed digital images. The pre-processor may be arranged to output the pre-processed digital images to a display independently from the received digital images being stored for subsequent post-processing. The exemplary digital image processor may also comprise a post-processor arranged to post-process received digital images that have been stored for post-processing.

Claims

1. A digital image processor for a digital camera, comprising:

a pre-processor arranged to;

receive digital images having a first resolution;

process the received digital images into a lower resolution to form pre-processed digital images;

output the pre-processed digital images from the digital image processor to a display; and

output the digital images in the first resolution to a memory for storage; and

a post-processor arranged to;

receive the pre-processed digital images from the memory;

process the pre-processed digital images to form post-processed digital images; and

output the post-processed digital images;

wherein the pre-processor includes;

a non-uniformity corrector capable of correcting non-uniformities included in the received digital images;

a programmable sampling filter that is connected to the non-uniformity corrector and capable of systematically selecting portions of the corrected digital images received from the non-uniformity corrector;

a modular transformer that is connected to the programmable sampling filter and capable of at least correcting aberrations in the sampled digital images received from the programmable sampling filter; and

a ditherer that is connected to the modular transformer and capable of at least correcting aliasing in the digital images received from the modular transformer.

2. The digital image processor recited in claim 1, wherein the pre-processed digital images are outputted to the display in a cineview operating mode.

3. The digital image processor recited in claim 1, wherein the digital image processor and the display comprise components of a digital camera.

4. The digital image processor recited in claim 1, wherein the display comprises an on-camera display of a digital camera.

5. The digital image processor recited in claim 1, wherein the post-processor is connected via a system bus to the pre-processor.

6. The digital image processor recited in claim 1, comprising a sampling filter that is adapted to reduce the received digital images into the lower resolution.

7. The digital image processor of claim 1 wherein the post-processor forms post-processed digital images as JPEG image files.

8. A digital camera, the digital camera comprising:

a memory;

a digital image processor;

a pre-processing portion of the digital image processor to, in a first operating mode, pre-process a digital image to form a pre-processed digital image, wherein pre-processing the digital image comprises correcting non-uniformities in the digital image, the digital image processor being configured to transmit the pre-processed digital image from the digital image processor to the memory without compression; and

a post-processing portion of the digital image processor to, in a second operating mode, receive the pre-processed digital image from the memory and post-process the pre-processed digital image to form a post-processed digital image, wherein the post-processed digital image is a compressed version of the pre-processed digital image.

9. The digital camera recited in claim 8, wherein the first operating mode and/or the second operating mode are user-actuated modes.

10. The digital camera recited in claim 8, wherein the post-processed digital image is stored separately from the pre-processed digital image.

11. The digital camera recited in claim 8, wherein the pre-processed digital image is not in a viewable format.

12. The digital camera recited in claim 8, wherein the post-processed digital image is in a viewable format.

13. The digital camera recited in claim 8, wherein post-processing the digital image comprises performing color correction on the pre-processed digital image.

14. The digital camera of claim 8 wherein post-processing the digital image comprises compressing the digital image into a JPEG image file.

15. The digital camera of claim 8 wherein the pre-processing portion of the digital image processor includes:

a non-uniformity corrector capable of correcting non-uniformities included in the received digital images;

a programmable sampling filter that is connected to the non-uniformity corrector and capable of systematically selecting portions of the corrected digital images received from the non-uniformity corrector;

a modular transformer that is connected to the programmable sampling filter and capable of at least correcting aberrations in the sampled digital images received from the programmable sampling filter; and

a ditherer that is connected to the modular transformer and capable of at least correcting aliasing in the digital images received from the modular transformer.

16. The digital camera of claim 8, wherein the correcting non-uniformities in the digital image that is performed by the pre-processing portion of the digital processor comprises Photo Response Non-Uniformity (PRNU) correction.

17. The digital camera of claim 8, wherein the correcting non-uniformities in the digital image that is performed by the pre-processing portion of the digital processor comprises white balancing.

18. The digital camera of claim 8, wherein the correcting non-uniformities in the digital image that is performed by the pre-processing portion of the digital processor comprises Photo Response Non-Uniformity (PRNU) correction and white balancing.