Methods for capturing and reading out images from an image sensor

• US 8,144,220 B2
• Filed: 09/30/2009
• Issued: 03/27/2012
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: TRUESENSE Imaging, Inc. (ON Semiconductor Corporation)
• Inventors: Border, John N., Compton, John T., Nichols, David N.
• Primary Examiner(s): SELBY, GEVELL V
• Application Number:
  US12/570,073
• Publication Number:
  US 20110074981A1
• Time in Patent Office: 909 Days
• Field of Search: 348/208.4, 348/208.12, 348/208.13, 348/222.1, 348/241, 348/362
• US Class Current: 348/241
• CPC Class Codes: H04N 2209/045 using mosaic colour filter
• CPC Class Codes: H04N 25/583 with different integration times
• CPC Class Codes: H04N 25/589 with different integration times, e.g. short and long exposures
• CPC Class Codes: H04N 25/73 using interline transfer [IT]

Abstract

Multiple images are captured where the exposure times for some of the images overlap and the images are spatially overlapped. Charge packets are transferred from one or more portions of pixels after particular integration periods, thereby enabling the portion or portions of pixels to begin another integration period while one or more other portions of pixels continue to integrate charge. Charge packets may be binned during readout of the images from the image sensor. Comparison of two or more images having different lengths of overlapping or non-overlapping exposure periods provides motion information. The multiple images can then be aligned to compensate for motion between the images and assembled into a combined image with an improved signal to noise ratio and reduced motion blur.

Claims

1. A method for producing an enhanced image with reduced motion blur comprising:

capturing a low noise image having an exposure determined by an autoexposure system;

capturing at least two reduced motion blur images with shorter exposures, wherein exposure times for the at least two reduced motion blur images at least partially overlap with an exposure time of the low noise image and the exposure times of the at least two reduced motion blur images do not overlap; and

combining the low noise image and the at least two reduced motion blur images to produce an enhanced image.

2. The method of claim 1, wherein the exposure for the low noise image is longer than the exposures for the reduced motion blur images.

3. The method of claim 1, wherein the exposures for the reduced motion blur images comprise different lengths of time.

4. The method of claim 1, further comprising opening a mechanical shutter prior to capturing the low noise image.

5. The method of claim 4, further comprising closing the mechanical shutter after capturing the at least two reduced motion blur images.

6. The method of claim 1, wherein the at least two reduced motion blur images are captured with odd numbered lines of pixels.

7. The method of claim 6, wherein the low noise image is captured with even numbered lines of pixels.

8. The method of claim 1, wherein the low noise image is captured with a first portion of pixels.

9. The method of claim 8, wherein the at least two reduced motion blur images are all captured with a second portion of pixels.

10. The method of claim 8, wherein the at least two reduced motion blur images are captured with at least two different portions of pixels.

11. The method of claim 9, wherein the first and second portions of pixels each comprise single lines of pixels.

12. The method of claim 9, wherein the first and second portions of pixels each comprise multiple lines of pixels.

13. The method of claim 12, wherein the multiple lines of pixels comprise multiple adjacent lines of pixels.

14. The method of claim 10, wherein the first and the at least two different portions of pixels each comprise single lines of pixels.