微信公众平台消息接口开发图片识别之人脸识别

前几个小应用似乎不给力，反应不冷不热，似乎大家不感兴趣，今天给大家推出一个亮眼一点的：微信公众平台上的人脸识别。

前段时间看到网上有个报道 四川大学计算机科学系主任、副教授 魏骁勇 开发了 基于图像的课堂考勤系统， 上课点名用人脸识别来‘刷脸’，看下图

    
    
    1357543196
    
    
    5830603629728080261

ToUserName 消息接收方微信号，一般为公众平台账号微信号
FromUserName 消息发送方微信号
CreateTime 消息创建时间
MsgType 消息类型；图片消息为image
PicUrl 图片链接地址
MsgId 消息ID号

2. 接口

Face++提供人脸识别接口，

检测给定图片(Image)中的所有人脸(Face)的位置和相应的面部属性接口地址如下：
http://apicn.faceplusplus.com/v2/detection/detect

返回如下

{
    "face": [
        {
            "attribute": {
                "age": {
                    "range": 5,
                    "value": 17
                },
                "gender": {
                    "confidence": 99.9781,
                    "value": "Female"
                },
                "glass": {
                    "confidence": 99.9815,
                    "value": "None"
                },
                "pose": {
                    "pitch_angle": {
                        "value": 0.000019753399999999996
                    },
                    "roll_angle": {
                        "value": 1.75177
                    },
                    "yaw_angle": {
                        "value": 4
                    }
                },
                "race": {
                    "confidence": 99.471,
                    "value": "Asian"
                },
                "smiling": {
                    "value": 87.1365
                }
            },
            "face_id": "c772b4b66c00d46b15344eff74b56e48"
        }
    ],
    "img_height": 293,
    "img_id": "3005132383841edd08c9b500fb1fe2c4",
    "img_width": 440,
    "session_id": "4e64c73fec19442cbefde3cf9bd6b53d",
    "url": ""
}

参数：

实现方法

取结果参数中的gender，age，race，smiling等参数 ，如

"attribute": {
                "age": {
                    "range": 5,
                    "value": 17
                },
                "gender": {
                    "confidence": 99.9781,
                    "value": "Female"
                },
                "glass": {
                    "confidence": 99.9815,
                    "value": "None"
                },
                "pose": {
                    "pitch_angle": {
                        "value": 0.000019753399999999996
                    },
                    "roll_angle": {
                        "value": 1.75177
                    },
                    "yaw_angle": {
                        "value": 4
                    }
                },
                "race": {
                    "confidence": 99.471,
                    "value": "Asian"
                },
                "smiling": {
                    "value": 87.1365
                }

上述结果中，

年龄age为17，误差在5岁
性别为female，表示女，置信度为99%
种族为亚洲Asian，
微笑度 87%

和图片比较一下，还是比较一致的

3. 程序实现

SDK如下：

"attribute": {
                "age": {
                    "range": 5,
                    "value": 17
                },
                "gender": {
                    "confidence": 99.9781,
                    "value": "Female"
                },
                "glass": {
                    "confidence": 99.9815,
                    "value": "None"
                },
                "pose": {
                    "pitch_angle": {
                        "value": 0.000019753399999999996
                    },
                    "roll_angle": {
                        "value": 1.75177
                    },
                    "yaw_angle": {
                        "value": 4
                    }
                },
                "race": {
                    "confidence": 99.471,
                    "value": "Asian"
                },
                "smiling": {
                    "value": 87.1365
                }

调用方式如下：

http://apius.faceplusplus.com/v2               ###
    ### or                                             ###
    ### https://apius.faceplusplus.com/v2              ###
    ######################################################
    var $server = &＃39;http://apicn.faceplusplus.com/v2&＃39;;
    #var $server = &＃39;https://apicn.faceplusplus.com/v2&＃39;;
    #var $server = &＃39;http://apius.faceplusplus.com/v2&＃39;;
    #var $server = &＃39;https://apius.faceplusplus.com/v2&＃39;;

    #############################################
    ### set your api key and api secret here. ###
    #############################################
    var $api_key = &＃39;{your API KEY}&＃39;;
    var $api_secret = &＃39;{your API SECRET}&＃39;;

    public function __construct($api_key=NULL, $api_secret=NULL, $server=NULL){
        if($api_key){
            $this->api_key = $api_key;
        }
        if($api_secret){
            $this->api_secret = $api_secret;
        }
        if($server){
            $this->server = $server;
        }
    }

    /**
    * @param $method : The Face++ API 
    * @param $params : Request Parameters
    * @return : Array {&＃39;http_code&＃39;:&＃39;Http Status Code&＃39;, &＃39;request_url&＃39;:&＃39;Http Request URL&＃39;,&＃39;body&＃39;:&＃39; JSON Response&＃39;}
    **/
    public function execute($method,$params){
        if(empty($params)){
            $params=array();
        }
        $params[&＃39;api_key&＃39;] = $this->api_key;
        $params[&＃39;api_secret&＃39;] = $this->api_secret;

        return $this->request("{$this->server}{$method}",$params);
    }

    private function request($request_url , $request_body){
        $useragent = &＃39;Faceplusplus PHP SDK/1.0&＃39;;
        $curl_handle = curl_init();
        curl_setopt($curl_handle, CURLOPT_URL, $request_url);
        curl_setopt($curl_handle, CURLOPT_FILETIME, TRUE);
        curl_setopt($curl_handle, CURLOPT_FRESH_CONNECT, FALSE);
        curl_setopt($curl_handle, CURLOPT_CLOSEPOLICY, CURLCLOSEPOLICY_LEAST_RECENTLY_USED);
        curl_setopt($curl_handle, CURLOPT_MAXREDIRS, 5);
        curl_setopt($curl_handle, CURLOPT_HEADER, FALSE);
        curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($curl_handle, CURLOPT_TIMEOUT, 5184000);
        curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, 120);
        curl_setopt($curl_handle, CURLOPT_NOSIGNAL, TRUE);
        curl_setopt($curl_handle, CURLOPT_REFERER, $request_url);
        curl_setopt($curl_handle, CURLOPT_USERAGENT, $useragent);
        if (extension_loaded(&＃39;zlib&＃39;)){
            curl_setopt($curl_handle, CURLOPT_ENCODING, &＃39;&＃39;);
        }
        curl_setopt($curl_handle, CURLOPT_POST, TRUE);
        if(array_key_exists(&＃39;img&＃39;,$request_body)){
            $request_body[&＃39;img&＃39;] = &＃39;@&＃39;.$request_body[&＃39;img&＃39;];
        }else{
            $request_body=http_build_query($request_body);
        }
        curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $request_body);
        $response_text = curl_exec($curl_handle);
        $reponse_header = curl_getinfo($curl_handle);
        curl_close($curl_handle);
        return array(&＃39;http_code&＃39;=>$reponse_header[&＃39;http_code&＃39;],&＃39;request_url&＃39;=>$request_url,&＃39;body&＃39;=>$response_text);
    }
}

在微信中再将结果整理成文本消息就可以了。

4. 效果展示

下面是实际使用结果：

漂亮/帅气指数鉴定技术

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