High dynamic range imaging device

• US 9,641,773 B2
• Filed: 01/10/2014
• Issued: 05/02/2017
• Est. Priority Date: 04/09/2008
• Status: Active Grant

• Current Assignee: HL Klemove Corporation
• Original Assignee: Gentex Corporation
• Inventors: Bechtel, Jon H., Andrus, Jeremy C.
• Primary Examiner(s): HSU, AMY R
• Application Number:
  US14/151,950
• Publication Number:
  US 20140125854A1
• Time in Patent Office: 1,208 Days
• CPC Class Codes: B60R 2001/1253 with cameras, video cameras or video screens
• CPC Class Codes: H04N 25/575 with a response composed of multiple slopes
• CPC Class Codes: H04N 25/589 with different integration times, e.g. short and long exposures
• CPC Class Codes: H04N 25/76 Addressed sensors, e.g. MOS or CMOS sensors

Abstract

The present invention relates to improved imaging devices having high dynamic range and to monitoring and automatic control systems incorporating the improved imaging devices.

Claims

1. An imaging device, comprising:

an array of pixels partitioned into at least 16 parallel addressable groups of pixels, each of the parallel addressable group of pixels independently selectable and the active pixels of each of the parallel addressable group of pixels subject to at least one specified task;

wherein the at least one specified task is a selective reset task performed as a single task simultaneously operating on at least a substantial subset of active pixels of a selected one of the parallel addressable group of pixels;

wherein the selective reset task determines active pixels to selectively reset and performs the reset selectively according to a determination and recordation of an indication of a reset for each individual pixel which is reset, the at least one specified task performed in parallel for at least a substantial subset of pixels in said selected parallel addressable group of pixels.

2. The imaging device of claim 1, wherein each of the parallel addressable group of pixels defines a substantial portion of one of a row of pixels in the array of pixels or a column of pixels in the array of pixels.

3. The imaging device of claim 1, wherein the parallel addressable group of pixels comprises a group of commonly spectral filtered pixels of a series of Bayer patterned spectrally filter pixels.

4. The imaging device of claim 1, further comprising a row of reset control circuits, each of the reset control circuits are linked via an associated communication path to an individual pixel in the selected parallel addressable group of pixels.

5. The selective reset task of claim 4, wherein the selective reset task comprises the row of reset control circuits that are configured to perform the selective reset of pixels in the selected parallel addressable group of pixels in a substantially parallel operation.

6. The imaging device of claim 1, wherein comparators and logic circuits perform selective reset functions and are partitioned into similar blocks each of which operate on one or more pixels of the selected parallel addressable group of pixels with the logic in the blocks at least partially duplicated from one block to the next.

7. The imaging device of claim 1, wherein pixels of a parallel addressable group are sampled at least partially in parallel and digitized using sequential tasks which partially overlap selective reset tasks.

8. The imaging device of claim 1, wherein pixels of a first parallel addressable group of pixels are first reset to begin a first pre-sample period and subsequently are subjected to a series of conditional resets to conditionally reset pixels on a pixel by pixel basis and to initiate an integration period for a new pre-sample or for an integration period selected for the pixel.

9. The imaging device of claim 8, wherein determination to reset a pixel and to initiate a selectable integration period is based at least in part on a result of a comparison of an indication of a charge accumulated on any given pixel during a pre-sample period to a threshold level.

10. The imaging device of claim 8, wherein a record is maintained in a corresponding memory for each pixel indicating if an integration period has been selected for the pixel and if so what integration period has been selected for the pixel.

11. The imaging device of claim 8, wherein conditional reset to begin an additional pre-sample period is bypassed for a given active pixel if a value recorded in the memory for the given active pixel indicates that an integration period has been selected for the given active pixel.

12. The imaging device of claim 8, wherein integrated charge on a pixel is digitized only once for each pixel which is read.