Method and apparatus for acquiring a high dynamic image using multiple cameras

1. A terminal, comprising:

a first camera configured to acquire an image in a first region;

a second camera located on the same side of the terminal as the first camera and configured to acquire the image in a second region according to an exposure; and

a processor, coupled to the first camera and the second camera, and configured to:

analyze the image acquired by the first camera,

select a default metering manner from among a plurality of metering manners when a result of the analysis is that the acquired image is not overexposed or underexposed,

select a second metering manner from among the plurality of metering manners when the result of the analysis is that the acquired image is overexposed,

select a third metering manner from among the plurality of metering manners when the result of the analysis is that the acquired image is underexposed,

determine, according to the selected metering manner, the exposure for use when the second camera acquires the image in the second region, and

synthesize the image acquired by the first camera and the image acquired by the second camera into at least one image,

wherein the plurality of metering manners comprises matrix metering and average metering.

2. The terminal according to claim 1 , wherein the default metering manner comprises center-weighted average metering or matrix metering or average metering.

3. The terminal according to claim 1 , wherein:

the second metering manner comprises a bright zone weighted metering manner; and the third metering manner comprises a dark zone weighted metering manner.

4. The terminal according to claim 1 , wherein the processor comprises:

an image processor configured to determine the exposure for use when the second camera acquires the image in the second region; and

a central processing unit (CPU) configured to synthesize the image acquired by the first camera and the image acquired by the second camera into the at least one image.

5. The terminal according to claim 4 , wherein the image processor comprises:

a first image processor configured to analyze the image acquired by the first camera; and

a second image processor coupled to the first image processor and configured to determine the exposure for use when the second camera acquires the image in the second region.

6. The terminal according to claim 1 , wherein the processor is a central processing unit (CPU) or an image processor.

7. A terminal, comprising:

a first camera and a second camera located on a same side of the terminal;

a processor, coupled to both the first camera and the second camera, and configured to:

select a metering manner from among a plurality of metering manners according to a region that is selected by a user based on at least one of an image previewed when the first camera takes a photograph and an image previewed when the second camera takes the photograph, wherein a default metering manner is selected when the region is not overexposed or underexposed, wherein a second metering manner is selected when the region is overexposed, wherein a third metering manner is selected when the region is underexposed, wherein the plurality of metering manners comprise matrix metering and average metering; and

determine an exposure according to the selected metering manner; and

a screen coupled to the processor and configured to simultaneously display the image previewed when the first camera takes the photograph and the image previewed when the second camera takes the photograph;

wherein one camera of the first camera and the second camera is configured to acquire an image according to the exposure.

8. The terminal according to claim 7 , wherein the screen is further configured to display the image acquired according to the exposure by the one camera of the first camera and the second camera.

9. The terminal according to claim 7 , wherein:

the other camera of the first camera and the second camera is configured to acquire an image; and

the processor is configured to synthesize the image acquired by the first camera and the image acquired by the second camera into at least one image.

10. The terminal according to claim 9 , wherein the screen is further configured to display the image that is obtained by means of synthesis.

11. An image processing method for use with a terminal comprising a first camera and a second camera, wherein the first camera and the second camera are located on a same side of the terminal, the method comprising:

acquiring, by the first camera, an image in a first region;

analyzing the image acquired by the first camera;

selecting a default metering manner from among a plurality of metering manners when a result of the analysis is that the acquired image is not overexposed or underexposed;

selecting a second metering manner from among the plurality of metering manners when the result of the analysis is that the acquired image is overexposed;

selecting a third metering manner from among the plurality of metering manners when the result of the analysis is that the acquired image is underexposed;

determining, according to the selected metering manner, an exposure used when the second camera acquires an image in a second region;

acquiring, by the second camera, the image in the second region according to the determined exposure; and

synthesizing the image acquired by the first camera and the image acquired by the second camera into at least one image,

wherein the plurality of metering manners comprises matrix metering and average metering.

12. The method according to claim 11 ,

wherein the default metering manner comprises center-weighted average metering or matrix metering or average metering.

13. The method according to claim 11 , wherein:

the second metering manner comprises a bright zone weighted metering manner; and

the third metering manner comprises a dark zone weighted metering manner.