php使用百度API实现人脸识别
1.注册百度开发者账号。
https://login.bce.baidu.com/?account= 注册登录成功后，进入控制台，在左边的导航栏找到产品-》人工智能-》人脸识别：
创建应用。创建应用成功后拿到应用的API Key和Secret Key
2.接口调用-获取access token
调用人脸识别接口前需要获取access token，示例代码：
function execCurl($url, $param) {
if (empty($url) || empty($param)) {
return array('result' => false, 'err_msg' => 'url or param is null');
}
$curl = curl_init();//初始化curl
curl_setopt($curl, CURLOPT_URL, $url);//抓取指定网页
curl_setopt($curl, CURLOPT_HEADER, 0);//设置header
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
curl_setopt($curl, CURLOPT_POST, 1);//post提交方式
curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
$data = curl_exec($curl);//运行curl
$curl_err_msg = curl_error($curl);
curl_close($curl);
if($data === false) {
return array('result' => false, 'err_msg' => $curl_err_msg);
}else {
return array('result' => true, 'data' => $data);
}
}
$url = 'https://aip.baidubce.com/oauth/2.0/token';
$param = array(
'grant_type' => 'client_credentials',
'client_id' => '你的API Key',
'client_secret' => '你的Secret Key'
);
$result = execCurl($url, $param);
3.调用人脸检查接口
如果需要判断一张图片中的人脸，是否符合后续识别或者对比的条件，在请求时在face_field参数中请求quality。
下面示例是请求图文为base64转码字符串（转码不能包含头信息），也可以传图片网络地址，官方文档：https://ai.baidu.com/docs#/Face-Detect-V3/top
示例代码：
function checkPictureToCheckFace($image_path, $access_token) {
$url = 'https://aip.baidubce.com/rest/2.0/face/v3/detect?access_token=' . $access_token;
$param = array(
'image' => base64EncodeImage($image_path),
'image_type' => 'BASE64',
'face_field' => 'quality'
);
$param = json_encode($param);
$result = execCurl($url, $param);
if($result['result'] == false) return $result;
$data = json_decode($result['data'], true);
if($data['error_code'] != 0) return array('result' => false, 'err_msg' => '上传的人脸不符合要求，请重新上传五官清晰的真实头像');
$err_result = array('result' => false, 'err_msg' => '上传的人脸不符合要求，请重新上传五官清晰的真实头像!');
$quality = $data['result']['face_list'][0]['quality'];
if($quality['occlusion']['left_eye'] > 0.6) return $err_result; // 左眼被遮挡的阈值
if($quality['occlusion']['right_eye'] > 0.6) return $err_result; // 右眼被遮挡的阈值
if($quality['occlusion']['nose'] > 0.7) return $err_result; // 鼻子被遮挡的阈值
if($quality['occlusion']['mouth'] > 0.7) return $err_result; // 嘴巴被遮挡的阈值
if($quality['occlusion']['left_cheek'] > 0.8) return $err_result; // 左脸颊被遮挡的阈值
if($quality['occlusion']['right_cheek'] > 0.8) return $err_result; // 右脸颊被遮挡的阈值
if($quality['occlusion']['chin_contour'] > 0.6) return $err_result; // 下巴被遮挡阈值
if($quality['blur'] != 0 && $quality['blur'] > 0.7) return $err_result; // 模糊度范围 0是最清晰，1是最模糊
if($quality['illumination'] < 40) return $err_result; // 光照范围
if($quality['completeness'] == 0) return $err_result; // 人脸完整度 0为人脸溢出图像边界，1为人脸都在图像边界内
return array('result' => true);
}
function execCurl($url, $param) {
if (empty($url) || empty($param)) {
return array('result' => false, 'err_msg' => 'url or param is null');
}
$curl = curl_init();//初始化curl
curl_setopt($curl, CURLOPT_URL, $url);//抓取指定网页
curl_setopt($curl, CURLOPT_HEADER, 0);//设置header
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);//要求结果为字符串且输出到屏幕上
curl_setopt($curl, CURLOPT_POST, 1);//post提交方式
curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
$data = curl_exec($curl);//运行curl
$curl_err_msg = curl_error($curl);
curl_close($curl);
if($data === false) {
return array('result' => false, 'err_msg' => $curl_err_msg);
}else {
return array('result' => true, 'data' => $data);
}
}
function base64EncodeImage($image_path) {
$base64_image = '';
$image_info = getimagesize($image_path);
$image_data = fread(fopen($image_path, 'r'), filesize($image_path));
$base64_image = chunk_split(base64_encode($image_data));
return $base64_image;
}
$image_path = 'image/1.jpg';
$access_token = '上一步的获取access token';
$result = checkPictureToCheckFace($image_path, $access_token);
判断是否符合人脸识别检查的字段说明：
