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Method for obtaining face image light source orientation based on android platform

A face image and image technology, applied in the field of image processing, can solve the problems of high algorithm complexity, high resource occupation, and inability to apply mobile phone software, etc., and achieve the effect of low time complexity, high compatibility, and real-time acquisition of light source orientation

Active Publication Date: 2015-09-16
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, most of these methods are based on the PC platform, the complexity of the algorithm is high, it is difficult to realize real-time judgment, and it takes up a lot of resources during operation, so it cannot be applied to mobile phone software.

Method used

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  • Method for obtaining face image light source orientation based on android platform
  • Method for obtaining face image light source orientation based on android platform
  • Method for obtaining face image light source orientation based on android platform

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Embodiment 1

[0021] Such as figure 1 As shown, this embodiment includes the following steps:

[0022] The first step is to establish a general image database, which includes face images and light source orientation information when taking photos.

[0023] The image database preferably includes an image database of human face images taken by people of different ages, genders, faces, and skin colors under different light source orientations.

[0024] The distribution of the database level data area is as follows figure 2 As shown in , among them: adjacent areas with the same color are regarded as the same area, and the number of photos collected in each area is roughly the same. The reason for the region segmentation is as follows: in the process of taking pictures, when the person being photographed faces the light source or the angle between the facing direction and the light direction vector is small, it is an acceptable shooting angle. Similarly, when people are backlit, there will b...

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Abstract

The invention relates to a method for obtaining a face image light source orientation based on an android platform. The method comprises: pretreatment is carried out on an image in a database to obtain a binary image with face information removed; segmentation is carried out on the image and pixel gray values of sub images are combined with image light source information to form a training set; and libsvm training is carried out on the training set and then the training set is used for detecting light source orientations in other images. According to the invention, convenient embedding to the existing pixel domain algorithm frame is realized; and the error can be guaranteed to be less than + / -5 degrees based on the model.

Description

technical field [0001] The present invention relates to a technology in the field of image processing, in particular to a method for obtaining the orientation of a light source of a human face image based on an android platform. Background technique [0002] Mobile phone photography is widely used in our daily life, but a very common problem is that sometimes due to ambient light, the photos taken will appear black faces, yin and yang faces, etc. The face image information obtains the orientation information of the light source during shooting in real time, so that corresponding suggestions can be made to the photographer, which helps to take more ideal photos. This is where the application significance of the present invention lies. [0003] There are many existing methods for obtaining illumination orientation for face recognition, such as the quotient image method first proposed by Riklin-Raviv, and similar methods such as self-appreciation image processing illumination ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/162G06V40/168
Inventor 杨蕊徐成文夏立盛斌
Owner SHANGHAI JIAO TONG UNIV
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