Method and device for correcting varying lateral chromatic aberration, storage medium, and computer equipment

Patent metadata

Field	Value
Publication number	US-11750943-B2
Application number	US-202117505661-A
Country	US
Kind code	B2
Filing date	Oct 20, 2021
Priority date	Oct 20, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

Provided is a method and a device for correcting lateral chromatic aberration, a storage medium and a computer equipment. In the method, a relationship model between lens position and magnitude of LCA is constructed based on preset parameters of lens positions, and the relationship model is stored as calibration data; system parameters of a camera to be corrected and pre-stored calibration data are obtained; the LCA of the camera to be corrected is obtained by calculating the system parameters; and the LCA is corrected by the calibration data. With the method, the LCA of the lens can be removed when the focus distance is changed, and the method is suitable for mass-production.

First claim

What is claimed is:

1. A method for correcting lateral chromatic aberration, comprising:
constructing a relationship model between lens position and magnitude of lateral chromatic aberration based on preset parameters of lens positions, and storing the relationship model as calibration data, comprising
capturing a target image from a test chart-diagram;
calculating magnitude of lateral chromatic aberration of a camera module based on the target image, comprising
amplifying the target image to obtain an amplified target image;
detecting target graphics and calculating mass centers of the target graphics based on the amplified target image;
compensating for shift of the mass centers by sampling shift compensation;
removing target graphics with wrong parameters by an outlier removal algorithm;
extrapolating the mass centers of the target graphics at borders of the amplified target image; and
converting scattered data into a 2D regular grid, so as to obtain magnitude of lateral chromatic aberration; and

storing the relationship model between lens position and magnitude of lateral chromatic aberration as calibration data;

acquiring system parameters of a camera to be corrected and pre-stored calibration data;
obtaining the lateral chromatic aberration of the camera to be corrected by calculating the system parameters; and
correcting the lateral chromatic aberration by the calibration data.

2. The method for correcting lateral chromatic aberration as described in claim 1 , wherein said storing the relationship model between lens position and magnitude of lateral chromatic aberration as calibration data comprises: storing the relationship model between lens position and magnitude of lateral chromatic aberration as calibration data into a memory of the camera to be corrected.

3. The method for correcting lateral chromatic aberration as described in claim 1 , wherein the calibration data comprises data in a format of a grid, a parametric model, or a symmetric model.

4. A device for correcting lateral chromatic aberration using the method as described in claim 1 , comprising:
a capturing module configured to capture a target image from a test chart-diagram;
a first calculation module configured to calculate magnitude of lateral chromatic aberration of a camera module based on the target image, and to construct a relationship model between lens position and magnitude of lateral chromatic aberration based on preset parameters of lens positions; and
a storage module configured to store the relationship model between lens position and magnitude of lateral chromatic aberration as the calibration data.

5. The device for correcting lateral chromatic aberration as described in claim 4 , wherein the storage module is further configured to store the relationship model between lens position and magnitude of lateral chromatic aberration into a memory of the camera to be corrected.

6. The device for correcting lateral chromatic aberration as described in claim 4 , wherein the calibration data comprises data in a format of a grid, a parametric model, or a symmetric model.

7. The device for correcting lateral chromatic aberration as described in claim 4 , wherein the first calculation module comprises:
an amplifying sub-module configured to amplify the target image to obtain an amplified target image;
a calculation sub-module configured to detect target graphics and calculate mass centers of the target graphics based on the amplified target image;
a compensation sub-module configured to compensate for shift of the mass centers by sampling shift compensation;
a removal sub-module configured to remove the target graphics with wrong parameters by an outlier removal algorithm;
an extrapolation sub-module configured to extrapolate the mass centers of the target graphics at borders of the amplified target image;
a conversion sub-module configured to convert scattered data into a 2D regular grid, so as to obtain magnitude of lateral chromatic aberration; and
a relationship model sub-module configured to construct the relationship model between lens position and magnitude of lateral chromatic aberration.

8. The device for correcting lateral chromatic aberration as described in claim 4 , further comprising:
an acquisition module configured to acquire system parameters of a camera to be corrected and pre-stored calibration data;
a second calculation module configured to obtain the lateral chromatic aberration of the camera to be corrected by the system parameters; and
a correction module configured to correct the lateral chromatic aberration by the calibration data.

9. A computer equipment, comprising a memory configured to store information comprising program instructions, and a processor configured to control execution of the program instructions, wherein the program instructions, when loaded and executed by the processor, perform the steps in the method for correcting lateral chromatic aberration as described in claim 1 .

Assignees

• Aac Optics Solutions Pte Ltd

Inventors

• Sevom Vida Fakour
• Paliy Dmytro
• Gren Juuso

Classifications

• Y02P90/30

  Computing systems specially adapted for manufacturing · CPC title

• G06T5/80

  Geometric correction · CPC title

• H04N25/611 Primary

  Correction of chromatic aberration · CPC title

• G02B27/005 Primary

  for correction of secondary colour or higher-order chromatic aberrations · CPC title

• G06T5/006

  Physics · mapped topic