Systems and methods for exposure control

Patent metadata

Field	Value
Publication number	US-11539897-B2
Application number	US-202117168208-A
Country	US
Kind code	B2
Filing date	Feb 5, 2021
Priority date	Oct 26, 2016
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

The present disclosure relates to systems and methods for determining the exposure setting of an imaging device having a set of exposure parameters. A target luma of the imaging device may be determined. A correspondence table may be obtained. The correspondence table may relate to a plurality of reference luma values and a plurality of groups of operation values of the set of exposure parameters, a group of operation values corresponding to a reference luma value. A reference luma value and a group of operation values of the set of exposure parameters may be identified based on the target luma and the correspondence table. An adjustment of at least one exposure parameter of the imaging device may be determined based on the identified group of operation values. The at least one exposure parameter of the imaging device may be adjusted based on the determined adjustment.

First claim

What is claimed is:

1. A system, comprising:
at least one processor;
at least one storage device storing a set of instructions, the set of instructions, when executed by the at least one processor, cause the system to:
determine a target luma of an imaging device in an exposure mode, the imaging device having a set of exposure parameters;
determine a current luma and a current group of operation values with respect to the set of exposure parameters of the imaging device in the exposure mode;
determine a first adjustment of the current group of operation values of exposure parameters based on the current luma and the target luma;
obtain a correspondence table relating to a plurality of reference luma values and a plurality of groups of operation values of the set of exposure parameters of the imaging device, a group of operation values of the set of exposure parameters of the imaging device corresponding to one of the plurality of reference luma values;
obtain setting information of the imaging device;
modify the correspondence table based on the setting information; and
determine, based on the first adjustment and the modified correspondence table, a second adjustment of at least one of the set of exposure parameters of the imaging device.

2. The system of claim 1 , wherein the imaging device includes at least one exposure mode of an auto exposure mode, a gain priority mode, a shutter priority mode, an aperture priority mode, or an anti-ghosting mode.

3. The system of claim 1 , wherein the set of exposure parameters of the imaging device include at least one of a gain, a shutter speed, or an aperture size.

4. The system of claim 1 , wherein the system is further caused to:
determine normalized values of the current group of operation values with respect to the set of exposure parameters of the imaging device;
determine a sum of the normalized values of the current group of operation values with respect to the set of exposure parameters;
determine a normalized value associated with the target luma based on the first adjustment and the sum of the normalized values of the current group of operation values with respect to the set of exposure parameters; and
identify the at least one exposure parameter to be adjusted based on the modified correspondence table and the normalized value associated with the target luma.

5. The system of claim 4 , wherein to determine normalized values of the current group of operation values with respect to the set of exposure parameters of the imaging device, the system is further caused to:
obtain a plurality of groups of operation values with respect to the set of exposure parameters of the imaging device;
normalize each operation value of the plurality of groups of operation values; and
determine the normalized values of the operation values in the current group based on the each normalized operation value of the plurality of groups of operation values.

6. The system of claim 1 , wherein the setting information includes a variation range of at least one of the set of exposure parameters.

7. The system of claim 1 , wherein the system is further caused to:
adjust, based on the second adjustment, the at least one of the set of exposure parameters of the imaging device.

8. A method implemented on a computing device having at least one processor and at least one storage device, the method comprising:
determining a target luma of an imaging device in an exposure mode, the imaging device having a set of exposure parameters;
determining a current luma and a current group of operation values with respect to the set of exposure parameters of the imaging device in the exposure mode;
determining a first adjustment of the current group of operation values of exposure parameters based on the current luma and the target luma;
obtaining a correspondence table relating to a plurality of reference luma values and a plurality of groups of operation values of the set of exposure parameters of the imaging device, a group of operation values of the set of exposure parameters of the imaging device corresponding to one of the plurality of reference luma values;
obtaining setting information of the imaging device;
modifying the correspondence table based on the setting information; and
determining, based on the first adjustment and the modified correspondence table, a second adjustment of at least one of the set of exposure parameters of the imaging device.

9. The method of claim 8 , wherein the imaging device includes at least one exposure mode of an auto exposure mode, a gain priority mode, a shutter priority mode, an aperture priority mode, or an anti-ghosting mode.

10. The method of claim 8 , wherein the set of exposure parameters of the imaging device include at least one of a gain, a shutter speed, or an aperture size.

11. The method of claim 8 , further comprising:
determining normalized values of the current group of operation values with respect to the set of exposure parameters of the imaging device;
determining a sum of the normalized values of the current group of operation values with respect to the set of exposure parameters;
determining a normalized value associated with the target luma based on the first adjustment and the sum of the normalized values of the current group of operation values with respect to the set of exposure parameters; and
identifying the at least one exposure parameter to be adjusted based on the modified correspondence table and the normalized value associated with the target luma.

12. The method of claim 11 , wherein the determining normalized values of the current group of operation values with respect to the set of exposure parameters of the imaging device comprises:
obtaining a plurality of groups of operation values with respect to the set of exposure parameters of the imaging device;
normalizing each operation value of the plurality of groups of operation values; and
determining the normalized values of the operation values in the current group based on the each normalized operation value of the plurality of groups of operation values.

13. The method of claim 8 , wherein the setting information includes a variation range of at least one of the set of exposure parameters.

14. The method of claim 8 , wherein the method further comprises:
adjusting, based on the second adjustment, the at least one of the set of exposure parameters of the imaging device.

15. A non-transitory computer readable medium, comprising a set of instructions, wherein when executed by at least one processor, the set of instructions direct the at least one processor to effectuate a method, the method comprising:
determining a target luma of an imaging device in an exposure mode, the imaging device having a set of exposure parameters;
determining a current luma and a current group of operation values with respect to the set of exposure parameters of the imaging device in the exposure mode;
determining a first adjustment of the current group of operation values of exposure parameters based on the current luma and the target luma;
obtaining a correspondence table relating to a plurality of reference luma values and a plurality of groups of operation values of the set of exposure parameters of the imaging device, a group of operation values of the set of exposure parameters of the imaging device corresponding to one of the plurality of reference luma values;
obtaining setting information of the imaging device;
modifying the correspondence table based on the setting information; and
determining, based on the first adjustment and the modified corresponden

Assignees

• Zhejiang Dahua Technology Co

Inventors

• Qu Erping
• Huang Qianfeng
• Pan Runfa
• Li Liangcheng

Classifications

• H04N23/667 Primary

  Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes · CPC title

• H04N23/75

  by influencing optical camera components · CPC title

• H04N23/76

  by influencing the image signals · CPC title

• H04N23/73 Primary

  by influencing the exposure time · CPC title

• H04N23/72

  Combination of two or more compensation controls · CPC title