Method and electronic device for generating high dynamic range image

Patent metadata

Field	Value
Publication number	US-2017163902-A1
Application number	US-201615243396-A
Country	US
Kind code	A1
Filing date	Aug 22, 2016
Priority date	Dec 8, 2015
Publication date	Jun 8, 2017
Grant date	—

Abstract

Embodiments of the present disclosure disclose a method and electronic device for generating an HDR image. The method comprises simultaneously obtaining different images of a target to be shot through the shooting apparatus with different shooting exposure settings; fusing the images obtained from different shooting apparatus according to brightness so as to obtain an HDR image of the target to be shot. The method and device for generating an HDR image provided in these embodiments of the present disclosure can reduce the shooting time of the HDR image.

First claim

What is claimed is:

1 . A method for generating a High Dynamic Range HDR image, executed by an electronic device, comprising:
obtaining simultaneously at least two images of a target to be shot by at least two shooting apparatuses configured with different exposure values on a terminal; and fusing the at least two images according to brightness so as to form the HDR image of the target to be shot.

2 . The method according to claim 1 , wherein, fusing the at least two images according to brightness so as to form the HDR image of the target to be shot comprises:
partitioning each of the images; selecting one of the at least two images as a reference image according to the exposure value; determining an underexposed block and an overexposed block in the reference image according to the brightness of each block in the reference image; selecting an actually used block of the HDR image in the position of the underexposed block according to the brightness of blocks corresponding to the underexposed block in different images; selecting an actually used block of the HDR image in the position of the overexposed block according to the brightness of blocks corresponding to the overexposed block in different images; and generating the HDR image according to the actually used block of the HDR image in the position of the underexposed block and the actually used block of HDR image in the position of the overexposed block.

3 . The method according to claim 2 , wherein, determining the underexposed block and the overexposed block in the reference image according to the brightness of each block in the reference image comprises:
determining a block with the block brightness higher than a threshold of overexposure brightness as the overexposed block, and determining a block with block brightness lower than a threshold of underexposure brightness as the underexposed block, according to the brightness of each block in the reference image, wherein, the threshold of the overexposure and the threshold of underexposure brightness are determined according to an average value of brightness of the reference image; or ranking the blocks according to the brightness of each block in the reference image, and selecting a set number of blocks as overexposed and underexposed blocks respectively according to the ranking.

4 . The method according to claim 2 , wherein, after selecting one image from the at least two images as the reference image according to the exposure value, the method also comprises:
determining images other than the reference image as overexposed and underexposed images, respectively, according to the ranking of the exposure values of each of the shooting apparatuses; deleting in overexposed images the blocks with the block brightness higher than that of the corresponding blocks of the reference image; and deleting in underexposed images the blocks with the block brightness lower than that of the corresponding blocks of the reference image.

5 . The method according to claim 2 , wherein
the selecting the actually used block of the HDR image in the position of the underexposed block according to the brightness of the blocks corresponding to the underexposed block in different images comprises: selecting a block with highest brightness as the actually used block of the HDR image in the position of the underexposed block according to the brightness of the blocks corresponding to the underexposed block in different images; and
the selecting the actually used block of the HDR image in the position of the overexposed block according to the brightness of the blocks corresponding to the overexposed block in different images comprises: selecting a block with lowest brightness as the actually used block of the HDR image in the position of the overexposed block according to the brightness of the blocks corresponding to the overexposed block in different images.

6 . The method according to claim 1 , wherein, after fusing the at least two images according to brightness so as to form the HDR image of the target to be shot, the method also comprises:
displaying a preview of the HDR image.

7 . An electronic device for generating an HDR image, comprising:
at least one processor; and a memory communicably connected with the at least one processor for storing instructions executable by the at least one processor, wherein execution of the instructions by the at least one processor causes the at least one processor to: obtain simultaneously at least two images of a target to be shot by at least two shooting apparatuses configured with different exposure values on the terminal, and fuse the at least two images according to brightness so as to form the HDR image of the target to be shot.

8 . The electronic device according to claim 7 , wherein when fusing the at least two images according to brightness so as to form the HDR image of the target to be shot, the executable instructions further cause the electronic device to:
partition the images; select one of the at least two images as a reference image according to the exposure value; determine an underexposed block and an overexposed block in the reference image according to the brightness of each block in the reference image; select an actually used blocks of the HDR image in the position of the underexposed blocks according to the brightness of blocks corresponding to the underexposed blocks in different images; select the actually used blocks of the HDR image in the position of the overexposed blocks according to the brightness of the blocks corresponding to the overexposed blocks in different images; and generate the HDR image according to the actually used blocks of HDR image in the position of the underexposed blocks and the actually used blocks of HDR image in the position of the overexposed blocks.

9 . The electronic device according to claim 8 , the executable instructions further cause the electronic device to:
determine a block with the block brightness higher than a threshold of overexposure brightness as an overexposed block, and determining a block with block brightness lower than a threshold of underexposure brightness as an underexposed block, according to the brightness of each block in the reference image, wherein the threshold of the overexposure and the threshold of underexposure brightness are determined according to an average value of brightness of the reference image; or rank the blocks according to the brightness of each block in the reference image, and selecting a set number of blocks as the overexposed and underexposed blocks respectively according to the ranking.

10 . The electronic device according to claim 8 , the executable instructions further cause the electronic device to:
determine images other than the reference image as the overexposed and underexposed images according to the ranking of the exposure values of the shooting apparatuses after selecting one image from the at least two images as the reference image according to the exposure value; deleting in overexposed images the blocks with the block brightness higher than that of the corresponding blocks of the reference image; and deleting in underexposed images the blocks with the block brightness lower than that of the corresponding blocks of the reference image.

11 . The electronic device according to claim 8 , wherein the executable instructions further cause the electronic device to:
select the block with highest brightness in the image as the actually used block of the HDR image in the position of the underexposed block according to the brightness of the blocks corresponding to the underexposed block in different images; and selec

Assignees

• Le Holdings Beijing Co Ltd
• Lemobile Information Technology Beijing Co Ltd

Inventors

• Wu Kai

Classifications

• H04N23/45

  for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images · CPC title

• H04N23/741

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

• H04N25/581

  acquired simultaneously · CPC title

• H04N23/71

  Circuitry for evaluating the brightness variation · CPC title

• H04N23/73

  by influencing the exposure time · CPC title