WHITE BALANCE PROCESSING METHOD AND APPARATUS

• US 20200137369A1
• Filed: 12/26/2019
• Published: 04/30/2020
• Est. Priority Date: 07/10/2017
• Status: Active Grant

• Current Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Original Assignee: Guangdong OPPO Mobile Telecommunications Corporation Limited
• Inventors: YUAN, Quan
• Granted Patent: US 11,082,677 B2
• Time in Patent Office: Days
• CPC Class Codes: G06T 2207/30201 Face
• CPC Class Codes: G06T 7/521 from laser ranging, e.g. using interferometry; from the projection of structured light
• CPC Class Codes: G06T 7/90 Determination of colour characteristics
• CPC Class Codes: G06V 40/171 Local features and components; Facial parts eye characteristics G06V40/18; Occluding parts, e.g. glasses; Geometrical relationships
• CPC Class Codes: H04N 23/88 for colour balance, e.g. white-balance circuits or colour temperature control

Abstract

A white balance processing method and apparatus are provided. The method comprises: imaging a living paragraphed object to obtain an image; obtaining a white balance gain value according to the area occupied by a target region containing a human face in the image; and performing white balance processing on the image according to the white balance gain value.

Claims

1. A white balance processing method, comprising:

imaging a living shot object to obtain an image;

obtaining a white balance gain value according to an area of a target region comprising a face in the image; and

performing white balance processing on the image according to the white balance gain value.

2. The white balance processing method of claim 1, wherein before imaging the living shot object to obtain the image, the method further comprises:

previewing the shot object to obtain multiple frames of preview images;

identifying postures of the shot object in the multiple frames of preview images; and

identifying, when there is a change on the postures of the shot object in the multiple frames of preview images, the shot object as the living shot object.

3. The white balance processing method of claim 2, wherein identifying the postures of the shot object in the multiple frames of preview images comprises:

for each frame of preview image, rendering an edge of a body structure of the shot object, the body structure comprising at least one of a mouse, eyes, arms, legs, hands or feet; and

identifying the posture of the shot object according to the rendered edge.

4. The white balance processing method of claim 2, wherein before identifying the postures of the shot object in the multiple frames of preview images, the method further comprises:

acquiring depth information of at least one frame of preview image;

identifying whether the shot object is in a plane form according to the depth information; and

determining that the shot object is in a three-dimensional form.

5. The white balance processing method of claim 4, wherein acquiring the depth information of the at least one frame of preview image comprises:

performing synchronization imaging between a structured light camera or a depth camera and a camera for capturing the preview image to obtain the depth information of the preview image.

6. The white balance processing method of claim 1, wherein obtaining the white balance gain value according to the area of the target region comprising the face in the image comprises:

calculating an area proportion of the target region in the image according to the area occupied by the target region in the image; and

calculating a first gain value and a second gain value of each color component according to the area proportion to obtain the white balance gain value, the first gain value being used to regulate the face in the image to a skin color and the second gain value being different from the first gain value.

7. The white balance processing method of claim 6, wherein calculating the first gain value and the second gain value of each color component according to the area proportion to obtain the white balance gain value comprises:

determining a weight of the first gain value and a weight of the second gain value according to the area proportion; and

performing weighted calculation on the first gain value and the second gain value according to the determined weight of the first gain value and the weight of the second gain value to obtain the white balance gain value.

8. The white balance processing method of claim 6, before calculating the first gain value and the second gain value of each color component according to the area proportion to obtain the white balance gain value, further comprising:

determining, when an area occupied by a face region in the image is not less than a preset area threshold, the face region as the target region.

9. The white balance processing method of claim 6, before calculating the first gain value and the second gain value of each color component according to the area proportion to obtain the white balance gain value, further comprising:

determining, when the area occupied by a face region in the image is less than a preset area threshold, a portrait region in the image as the target region.

10. A white balance processing device, comprising a camera and a processor, wherein:

the camera is configured to image a living shot object to obtain an image; and

the processor is configured to;

obtain a white balance gain value according to an area of a target region comprising a face in the image; and

perform while balance processing on the image according to the white balance gain value.

11. The white balance processing device of claim 10, wherein the camera is configured to preview the shot object to obtain multiple frames of preview images;

and

the processor is configured to identify postures of the shot object in the multiple frames of preview images and identify, when there is a change on the postures of the shot object in the multiple frames of preview images, the shot object as the living shot object.

12. The white balance processing device of claim 11, wherein the processor is configured to:

for each frame of preview image, render an edge of a body structure of the shot object, the body structure comprising at least one of a mouse, eyes, arms, legs, hands or feet; and

identify the posture of the shot object according to the rendered edge.

13. The white balance processing device of claim 11, wherein the processor is configured to:

acquire depth information of at least one frame of preview image;

identify whether the shot object is in a plane form according to the depth information; and

determine that the shot object is in a three-dimensional form.

14. The white balance processing device of claim 13, wherein the processor is configured to:

perform synchronization imaging between a structured light camera or a depth camera and the camera for capturing the preview image to obtain the depth information of the preview image.

15. The white balance processing device of claim 10, wherein the processor is configured to:

calculate an area proportion of the target region in the image according to the area occupied by the target region in the image; and

calculate a first gain value and a second gain value of each color component according to the area proportion to obtain the white balance gain value, the first gain value being used to regulate the face in the image to a skin color and the second gain value being different from the first gain value.

16. The white balance processing device of claim 15, wherein the processor is configured to:

determine a weight of the first gain value and a weight of the second gain value according to the area proportion; and

perform weighted calculation on the first gain value and the second gain value according to the determined weight of the first gain value and the weight of the second gain value to obtain the white balance gain value.

17. The white balance processing device of claim 15, wherein the processor is configured to:

determine, when an area occupied by a face region in the image is not less than a preset area threshold, the face region as the target region.

18. The white balance processing device of claim 15, wherein the processor is configured to:

determine, when an area occupied by a face region in the image is less than a preset area threshold, a portrait region in the image as the target region.

19. The white balance processing device of claim 15, wherein the second gain value is determined according to a portrait region in the image.

20. A non-transitory computer-readable storage medium, having a computer program stored thereon, wherein the program is executed by a processor to implement a white balance processing method, the method comprising:

imaging a living shot object via a camera to obtain an image;

obtaining a white balance gain value according to an area of a target region comprising a face in the image; and

performing white balance processing on the image according to the white balance gain value.