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An image processing method and a mobile terminal

An image processing and mobile terminal technology, applied in the field of communication, can solve problems such as background distortion, difficulty in brightness, inability to adjust brightness or contrast, etc., and achieve the effect of brightness adjustment and improvement

Active Publication Date: 2019-05-07
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the effect of mobile phone selfies is basically to control the brightness and contrast of the entire picture through gamma correction, or to brighten the whole through ae exposure compensation. The existing technology cannot adjust the brightness or contrast of local areas such as the face or skin tone. adjustments, while overall adjustments can distort the background and make it difficult to increase brightness while maintaining the depth and contrast of skin tones

Method used

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  • An image processing method and a mobile terminal
  • An image processing method and a mobile terminal
  • An image processing method and a mobile terminal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] refer to figure 1 , shows a flow chart of steps of an image processing method according to Embodiment 1 of the present invention.

[0021] The image processing method of the embodiment of the present invention comprises the following steps:

[0022] Step 101: Identify the face area of ​​the target image, and calculate the brightness difference value of the face area. The brightness difference value is the difference between the brightness of the first part of the face area and the brightness of the second part. The brightest part, and the second part is the darkest part of the face area.

[0023] The target image can be the image stored on the mobile terminal, or the original image captured by the camera of the mobile terminal (such as the front camera), or the brightness or contrast of the original image can be basically adjusted by the ISP (Image signal processor) image obtained afterwards.

[0024] For example, a skin color segmentation algorithm and an outline al...

Embodiment 2

[0030] refer to figure 2 , shows a flow chart of steps of an image processing method according to Embodiment 2 of the present invention.

[0031] The image processing method in the embodiment of the present invention specifically includes the following steps:

[0032] Step 201: Determine an area in the target image whose chroma satisfies a second preset threshold and whose brightness satisfies a third preset threshold, as the target area.

[0033] Taking the application in selfie beautification as an example, in this step, a skin color segmentation algorithm may be used to determine the target area such as the skin color area. Among them, the main difference of the skin color lies in gray scale information (brightness information) and chroma information. By sampling skin color in a suitable color space, a chromaticity distribution function representing skin color can be established to determine the second preset threshold for distinguishing skin color from non-skin color; a...

Embodiment 3

[0057] refer to image 3 , shows a structural block diagram of a mobile terminal according to Embodiment 3 of the present invention.

[0058] The mobile terminal in the embodiment of the present invention may include: an identification calculation module 301, configured to identify the face area of ​​the target image, and calculate the brightness difference value of the face area, where the brightness difference value is the brightness of the first part of the face area and the brightness of the second part The difference between the brightness, the first part is the brightest part in the face area, and the second part is the darkest part in the face area; the first adjustment module 302 is configured to if the brightness difference is not in the first preset threshold Within the range, adjust the brightness and contrast of the face area according to the brightness difference and the first preset threshold range.

[0059] Wherein the target image can be the image stored on th...

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Abstract

The embodiment of the invention provides an image processing method and a mobile terminal. The method is applied to the mobile terminal. The method comprises the steps that a face area of a target image is recognized, the brightness difference value of the face area is calculated, the brightness difference value is the difference value between the brightness of a first part and the brightness of asecond part of the face area, the first part is the brightest part in the face area, and the second part is the darkest part in the face area; And if the brightness difference value is not within a first preset threshold range, the brightness and the contrast of the face region are adjusted according to the brightness difference value and the first preset threshold range. According to the technical scheme, the brightness and the contrast ratio of the face area can be adjusted independently, the light and shade relation of other areas in the target image cannot be affected completely, and therefore the contrast ratio can be improved while brightness adjustment is conducted on the face area.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and in particular, to an image processing method and a mobile terminal. Background technique [0002] With the rise of the selfie industry, in order to get a better selfie effect, the ISP (Image signal processor) needs to make relatively large adjustments to the color and brightness. For example, the ideal selfie skin color requires white and bright skin, strong contrast, and a certain three-dimensionality. . [0003] At present, the effect of mobile phone selfies is basically to control the brightness and contrast of the entire picture through gamma correction, or to brighten the whole through ae exposure compensation. The existing technology cannot adjust the brightness or contrast of local areas such as the face or skin tone. adjustments, while overall adjustments can distort the background and make it difficult to increase the brightness while maintaining the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 胡静婕
Owner VIVO MOBILE COMM CO LTD