Processing method of scene image of device with shooting function, device with shooting function and storage medium

Patent metadata

Field	Value
Publication number	US-9338367-B2
Application number	US-201414547573-A
Country	US
Kind code	B2
Filing date	Nov 19, 2014
Priority date	Jun 19, 2014
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

One or more embodiments of the present application provide a processing method of a scene image of a device with a shooting function, the device with the shooting function and a storage medium. The method includes: determining first and second combined regions in a pre-shot image of a shot scene according to gray values of pixels in the pre-shot image; determining first and second exposures according to the determined first and second combined regions respectively; adjusting respectively gray values of pixels in a first image region corresponding to the first combined region in a first image shot at the first exposure, and gray values of pixels in a second image region corresponding to the second combined region in a second image shot at the second exposure; and splicing the two adjusted image regions together to obtain the scene image.

First claim

The invention claimed is:

1. A processing method of a scene image of a device with a shooting function, comprising:
determining a first combined region and a second combined region in a pre-shot image of a shot scene according to gray values of respective pixels in the pre-shot image, wherein the first combined region contains at least one highlight region, and a remaining region excluding the first combined region in the pre-shot image is the second combined region;
determining a first exposure according to a mean value of gray values of respective pixels in the first combined region, and determining a second exposure according to a mean value of gray values of respective pixels in the second combined region;
shooting the shot scene respectively at the first exposure and the second exposure to obtain a first image and a second image;
adjusting respectively gray values of respective pixels in a first image region corresponding to the first combined region in the first image, and gray values of respective pixels in a second image region corresponding to the second combined region in the second image;
splicing the adjusted first image region and the adjusted second image region to obtain the scene image of the shot scene.

2. The method of claim 1 , wherein the operation of determining the first combined region and the second combined region in the pre-shot image of the shot scene according to the gray values of the respective pixels in the pre-shot image comprises:
determining an intermediate gray value according to a mean value of a maximum gray value and a minimum gray value among the gray values of the respective pixels in the pre-shot image;
determining a region, of which a region area is larger than a preset threshold value and in which gray values of respective pixels are all larger than the intermediate gray value, in the pre-shot image as a highlight region;
determining at least one highlight region as the first combined region.

3. The method of claim 1 , wherein the operation of adjusting respectively the gray values of the respective pixels in the first image region and the gray values of the respective pixels in the second image region comprises:
determining a gray adjusting coefficient according to a maximum gray value and a minimum gray value among the gray values of the respective pixels in the first image region and a maximum gray value and a minimum gray value among the gray values of the respective pixels in the second image region;
adjusting respectively the gray values of the respective pixels in the first image region and the gray values of the respective pixels in the second image region according to the gray adjusting coefficient and a gray adjusting formula, wherein the gray adjusting formula is:
a′=a −( a−a 0 )* k

wherein a′ refers to an adjusted gray value; a refers to an unadjusted gray value; a 0 refers to an adjustment approaching value, if the gray value is decreased, the value of a 0 is a pre-defined minimum gray value, and if the gray value is increased, the value of a 0 is a pre-defined maximum gray value; k refers to the gray adjusting coefficient.

4. The method of claim 3 , wherein the gray adjusting coefficient k is determined in a following manner:
determining a total gray adjusting amount Q=M−N according to a difference between the maximum gray value M among the gray values of the respective pixels in the second image region and the minimum gray value N among the gray values of the respective pixels in the first image region;
determining a difference Q 1 between a maximum gray value and a minimum gray value among the gray values of the respective pixels in the first combined region;
determining a difference Q 2 between a maximum gray value and a minimum gray value among the gray values of the respective pixels in the second combined region;
when adjusting the gray values of the respective pixels in the first image region, determining the gray adjusting coefficient to be

k
=

M
-
N



N
-

a
0



*

Q
2

Q
1

+

Q
2

;

when adjusting the gray values of the respective pixels in the second image region, determining the gray adjusting coefficient to be

k
=

M
-
N



M
-

a
0



*

Q
1

Q
1

+

Q
2

.

5. A device with a shooting function, comprising:
a memory; and
one or more processors,
wherein the memory stores computer-readable program codes, and the one or more processors are used to execute the computer-readable program codes to implement:
determining a first combined region and a second combined region in a pre-shot image of a shot scene according to gray values of respective pixels in the pre-shot image, wherein the first combined region contains at least one highlight region, and a remaining region excluding the first combined region in the pre-shot image is the second combined region;
determining a first exposure according to a mean value of gray values of respective pixels in the first combined region, and determining a second exposure according to a mean value of gray values of respective pixels in the second combined region;
shooting the shot scene respectively at the first exposure and the second exposure to obtain a first image and a second image;
adjusting respectively gray values of respective pixels in a first image region corresponding to the first combined region in the first image, and gray values of respective pixels in a second image region corresponding to the second combined region in the second image;
splicing the adjusted first image region and the adjusted second image region to obtain the scene image of the shot scene.

6. The device of claim 5 , wherein the operation of determining the first combined region and the second combined

Assignees

• Hisense Electric Co Ltd
• Hisense Usa Corp
• Hisense Int Co Ltd

Inventors

• Hou Guilin
• Huang Fei
• Sun Xuebin

Classifications

• H04N23/73

  by influencing the exposure time · CPC title

• G06T5/50 Primary

  using two or more images, e.g. averaging or subtraction · CPC title

• H04N23/741

  by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors · CPC title

• H04N25/589

  with different integration times, e.g. short and long exposures · CPC title

• G06T2207/20221

  Image fusion; Image merging · CPC title