本文讲解如何使用百度提供的人脸识别技术进行简单的应用，这里以CI 框架为例进行说明。
在百度AI开放平台使用百度的人脸识别能力，只需要三个核心步骤即可操作完成：
1.获取接口权限
2.准备接口调用工具
3.进行接口调用
步骤
1.开通百度开发者账号
地址：https://console.bce.baidu.com/ai/?_=1528192333418&fromai=1#/ai/face/overview/index
2.创建人脸识别应用
账号登录成功，您需要创建应用才可正式调用AI能力。应用是您调用API服务的基本操作单元，您可以基于应用创建成功后获取的API Key及Secret Key，进行接口调用操作，及相关配置。
创建应用，填写【应用名称】和【应用描述】，即可创建应用（其他选项可以不做操作，使用默认值即可）
3.获取秘钥
在您创建完毕应用后，平台将会分配给您此应用的相关凭证：API Key、Secret Key。使用秘钥将可以在下一步中获取调用接口所需的Access Token。
接口开发及应用
在拿到秘钥及应用的相关凭证API Key、Secret Key后，就可以开发接口调用了，这里已CI 框架为例进行说明。
必要参数说明
access_token 百度鉴权凭证 ，以redis缓存形式保存；
grant_type： 必须参数，固定为client_credentials；
client_id： 必须参数，应用的API Key；
client_secret： 必须参数，应用的Secret Key；
需要注意的是 Header Content-Type 参数设置为 application/x-www-form-urlencoded
<?php
/**
* 百度人脸识别 api
* Created by PhpStorm.
* author: dichuanjun
* Date: 2018/5/7
* Time: 15:29
*/
class Baiduface
{
protected $CI;
protected $grand_type;
protected $client_id;
protected $client_secret;
protected $url;
protected $header;
public static $baidu_access_token_key = "ibearcar_baidu_access_token_key";
public function __construct()
{
$this->CI = & get_instance();
$this->CI->load->driver('cache', array('adapter' => 'redis'));
$this->grand_type='client_credentials';
$this->client_id='OyF3BFkK2T7LbqWgQYIsPtIm';
$this->client_secret='wH2umjZ8YapP0jatX7H1xT7uyfHQwGBq';
$this->url='https://aip.baidubce.com/oauth/2.0/token';
$this->header=array('Content-type:application/x-www-form-urlencoded');
}
/**
* 获取 Access Token
*/
public function get_access_token(){
$post_data['grant_type'] = $this->grand_type;
$post_data['client_id'] = $this->client_id;
$post_data['client_secret'] = $this->client_secret;
$access_token = $this->CI->cache->get(self::$baidu_access_token_key); //这里是access_token以redis缓存形式保存
if(empty($access_token)){
$data_json=$this->_http_post($this->url,$post_data,'');
$data=json_decode($data_json,true);
if(isset($data['error'])){
return false;
}
$access_token=$data['access_token'];
$this->CI->cache->save(self::$baidu_access_token_key, $access_token, 28 * 24 * 3600);
$file="./logs/baidu_access_token_log.txt";
$str=date('Y-m-d H:i:s')." access_token:{$access_token}\r\n";
file_put_contents($file,$str,FILE_APPEND);
}
return $access_token;
}
/**
* 人脸识别--公安验证v3版
* @param $data
* @return bool
*/
public function face_verify($data){
$access_token = $this->get_access_token();
$url="https://aip.baidubce.com/rest/2.0/face/v3/person/verify?access_token={$access_token}";
$post_data['image']=$data['image'];
$post_data['id_card_number']=$data['id_card_number'];
$post_data['name']=$data['name'];
$post_data['image_type']='BASE64';
$data_json=$this->_http_post($url,$post_data,$this->header);
$data = json_decode($data_json,true);
if($data['error_code']==0){
if($data['result']['score']>=80){
return true;
}
}else{
return false;
}
}
/**
* 验证身份信息
* @param $data
* @return array
*/
public function verify($data){
$idcard_info=$this->idcard($data);
$driving_license_info=$this->driving_license($data);
$code=6000;
$res_data='';
if(isset($idcard_info[0]['error_code'])){
$code = 6002;
$result=[
'code'=>$code,
'data'=>$res_data,
];
return $result;
}
if(isset($idcard_info[1]['error_code'])){
$code = 6003;
$result=[
'code'=>$code,
'data'=>$res_data,
];
return $result;
}
if(isset($driving_license_info['error_code'])){
$code = 6005;
$result=[
'code'=>$code,
'data'=>$res_data,
];
return $result;
}
if(empty($idcard_info[0]['words_result']['公民身份号码']['words'])){
$code = 6003;
}
$this->CI->load->model('M_user_certificate');
$idcard=$this->CI->M_user_certificate->get_certificate_by_idcard($idcard_info[0]['words_result']['公民身份号码']['words']);
if(!empty($idcard)){
$code=6012;
}
if(strtotime($idcard_info[1]['words_result']['失效日期']['words'])<time()){
$code = 6007;
}
if(strtotime($driving_license_info['words_result']['至']['words'])<time()){
$code = 6008;
}
if($idcard_info[0]['words_result']['公民身份号码']['words']!=$driving_license_info['words_result']['证号']['words']){
$code = 6006;
}
if($code==6000){
$verify_data=[
'image'=>$data['personal_image'],
'id_card_number'=>$idcard_info[0]['words_result']['公民身份号码']['words'],
'name'=>$driving_license_info['words_result']['姓名']['words'],
];
//身份验证
if(!$this->face_verify($verify_data)){
$code = 6009;
}
}
if($driving_license_info['words_result']['性别']['words']=='男'){
$sex=0;
}else{
$sex=1;
}
//验证成功
if($code==6000){
$certificate_data=[
'name'=>$driving_license_info['words_result']['姓名']['words'],
'sex'=>$sex,
'id_card_number'=>$driving_license_info['words_result']['证号']['words'],
'birth_date'=>date('Y-m-d',strtotime($driving_license_info['words_result']['出生日期']['words'])),
'card_date'=>date('Y-m-d',strtotime($idcard_info[1]['words_result']['失效日期']['words'])),
'driving_type'=>$driving_license_info['words_result']['准驾车型']['words'],
'driving_first_date'=>date('Y-m-d',strtotime($driving_license_info['words_result']['初次领证日期']['words'])),
'driving_num'=>$driving_license_info['words_result']['证号']['words'],
'driving_date'=>date('Y-m-d',strtotime($driving_license_info['words_result']['至']['words'])),
];
$res_data=$certificate_data;
}
$result=[
'code'=>$code,
'data'=>$res_data,
];
return $result;
}
/**
* ocr 身份证识别
* @param $data
* @return array
*/
public function idcard($data){
$access_token = $this->get_access_token();
$res_data=[];
$data=[
'front'=>$data['idcard_front'],
'back'=>$data['idcard_back']
];
$url="https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?access_token={$access_token}";
foreach ($data as $key=>$value){
$post['image']=$value;
$post['id_card_side']=$key;
$post['detect_risk']=true;
$res_data[]=json_decode($this->_http_post($url,$post,$this->header),true);
}
return $res_data;
}
/**
* ocr 驾驶证识别
* @param $data
* @return array
*/
public function driving_license($data){
$post_data['image']=$data['driving_image'];
$access_token = $this->get_access_token();
$url="https://aip.baidubce.com/rest/2.0/ocr/v1/driving_license?access_token={$access_token}";
$res_data=json_decode($this->_http_post($url,$post_data,$this->header),true);
return $res_data;
}
private function _http_post($url, $data,$header) {
$o = "";
foreach ( $data as $k => $v )
{
$o.= "$k=" . urlencode( $v ). "&" ;
}
$data = substr($o,0,-1);
$handle = curl_init();
curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false); // 跳过证书检查
curl_setopt($handle, CURLOPT_SSL_VERIFYHOST, 2); // 从证书中检查SSL加密算法是否存在
curl_setopt($handle, CURLOPT_POST, 1);
if(!empty($header)){
curl_setopt($handle,CURLOPT_HTTPHEADER,$header); //设置header
}
// curl_setopt($handle, CURLOPT_POSTFIELDS, http_build_query($data));
curl_setopt($handle, CURLOPT_POSTFIELDS, $data);
curl_setopt($handle, CURLOPT_TIMEOUT, 10);
curl_setopt($handle, CURLOPT_URL, $url);
curl_setopt($handle, CURLOPT_RETURNTRANSFER, 1);
$response = curl_exec($handle);
curl_close($handle);
return $response;
}
}
接口应用
/**
* 百度人脸识别
*/
public function baidu_face_verify(){
$this->load->model('M_user_certificate');
$this->load->model('M_user');
$user_info = $this->session->userdata(KEY_USER_INFO);
$this->load->library('baiduface');
if(empty($user_info)){
$this->api_response_result(11);
}
$driving_image=$this->input->post('driving_image',true);//驾驶证
$personal_image=$this->input->post('personal_image',true);//个人照片
$idcard_front=$this->input->post('idcard_front',true); //身份证正面
$idcard_back=$this->input->post('idcard_back',true); //身份证背面
if(empty($driving_image)){
$this->api_response_result(6011);
}
if(empty($personal_image)){
$this->api_response_result(6010);
}
if(empty($idcard_front)){
$this->api_response_result(6004);
}
if(empty($idcard_back)){
$this->api_response_result(6006);
}
$verify_data['driving_image']=$driving_image;
$verify_data['personal_image']=$personal_image;
$verify_data['idcard_front']=$idcard_front;
$verify_data['idcard_back']=$idcard_back;
$res = $this->baiduface->verify($verify_data);
$user_data=[
'id'=>$user_info['id'],
'is_identification'=>0,
];
if($res['code']==6000){
$certificate_data=$res['data'];
$certificate_data['user_id']=$user_info['id'];
$this->M_user_certificate->save_entry($certificate_data);
$user_data['is_identification']=1;//已认证
$this->M_user->save_entry($user_data);
$user = $this->M_user->get_by_phone($user_info['mobile_phone']);
$this->_login($user);//更新session
}else{
$this->M_user->save_entry($user_data);
}
$this->api_response_result($res['code']);
}
参考地址：
百度人脸识别api https://cloud.baidu.com/doc/OCR/OCR-API.html#.E8.BA.AB.E4.BB.BD.E8.AF.81.E8.AF.86.E5.88.AB