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Method and device for adjusting face region automatic exposure control

An automatic exposure and face area technology, applied in the field of exposure processing, can solve the problems of unrecoverable information, overexposure of the face area, and image quality degradation, so as to improve satisfaction, eliminate overexposed areas, and improve image quality.

Active Publication Date: 2017-11-10
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Abstract
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Problems solved by technology

[0004] However, in the automatic exposure control technology, the mainstream AEC algorithm controls the brightness of the image based on the brightness information of the entire frame of the image. The way of exposure control can easily lead to overexposure of the face area, and the overexposure of the image will cause irrecoverable information, resulting in a decrease in the quality of the captured image

Method used

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  • Method and device for adjusting face region automatic exposure control
  • Method and device for adjusting face region automatic exposure control
  • Method and device for adjusting face region automatic exposure control

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] From the above analysis, it can be seen that in AEC technology, the brightness is adjusted according to the average brightness information of the whole frame. When the value is high, it is very likely to cause the face to be overexposed and cause color spots, thus resulting in poor image quality and users are not satisfied with the captured images.

[0030] For example, when shooting an image containing a human face, it may be due to the influence of ambient light, for example, the light hitting the human face is stronger ...

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Abstract

The invention includes a method and a device for adjusting face region automatic exposure control. The method includes the following steps: dividing a face region into a plurality of sub-region blocks, doing statistics of the brightness of all the sub-region blocks, and constructing a brightness histogram of the color channels in the face region; analyzing the brightness histogram of the color channels according to the order of brightness from high to low, determining the lowest brightness for each color channel to meet the current automatic exposure control brightness according to the correspondence between brightness and the number of sub-region blocks, and determining the maximum brightness as a reference brightness from all the lowest brightness and a reference color channel corresponding to the reference brightness; and acquiring a target brightness corresponding to the current automatic exposure control brightness, and adjusting the brightness of the reference color channel according to the target brightness to enable the reference color channel to meet the condition that the lowest brightness thereof under the target brightness is the reference brightness. Thus, overexposure of the face region and color spots caused thereby are avoided, and the image quality is improved.

Description

technical field [0001] The present invention relates to the technical field of exposure processing, in particular to an adjustment method and device for automatic exposure control of a human face area. Background technique [0002] With the popularity of terminal devices such as smart phones, users have more and more diversified functional requirements for terminal devices. For example, the camera function of terminal devices is widely required by users because it can bring great convenience to users' production and life. , and the key to the quality of the image captured by the camera is the exposure control. The purpose of the exposure control is to make the brightness of the current image meet the expected brightness while minimizing the overexposed and underexposed areas in the image. [0003] In related technologies, an automatic exposure control (Automatic Exposure Control, AEC) technology is used to control the overall exposure control of the image by controlling the ...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/243
CPCH04N23/70H04N23/76H04N23/611H04N23/71H04N23/73H04N23/12G06T5/40G06T7/70
Inventor 刘凯
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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