基於百度AI+navigator+jquery-webcam+jsp實現人臉識別登陸續，真正兼容各瀏覽器

一、對於百度AI的調用和簡單的jquery-webcam獲取攝像頭圖像的方法，參見以往的博客：http://www.cnblogs.com/guo-eric/p/8371861.htmljavascript

二、對於谷歌瀏覽器，能夠採用H5標籤，直接獲取canvas標籤實現php

<!DOCTYPE html>
<html>
  <head>
    <title>paizhao.html</title>
    
    <meta name="keywords" content="keyword1,keyword2,keyword3">
    <meta name="description" content="this is my page">
    <meta name="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
 <body>
<div id="contentHolder">
    <video id="video" width="320" height="320" autoplay></video>
    <button id="start" style="display:block" >start</button>
    <button id="picture" style="display:block" >paizhao</button>
    <canvas style="display:block" id="canvas" width="320" height="320"></canvas>
    <button id="sc" style="display:block" >shangchuan</button>
    <button id="stop" style="display:block" >stop</button>
</div>
</body>
<script> var mediaStreamTrack; document.getElementById("start").addEventListener("click", function () { navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia; if (navigator.getUserMedia) { navigator.getUserMedia({ audio: true, video: { width: 320, height: 320 } }, function(stream) { mediaStreamTrack = typeof stream.stop === 'function' ? stream : stream.getTracks()[1]; video.src = (window.URL || window.webkitURL).createObjectURL(stream); video.play(); /* var video = document.getElementById("video"); video.src = window.URL.createObjectURL(stream); video.onloadedmetadata = function(e) { console.log('nihao44eee4aaaaddda'); video.play(); }; */ }, function(err) { console.log("The following error occurred: " + err.name); } ); } else { console.log("getUserMedia not supported"); } }); document.getElementById("stop").addEventListener("click", function () { mediaStreamTrack && mediaStreamTrack.stop(); }); document.getElementById("picture").addEventListener("click", function () { var context = document.getElementById("canvas").getContext("2d"); context.drawImage(video, 0, 0, 320, 320); }); document.getElementById("sc").addEventListener("click", function () { var imgData=document.getElementById("canvas").toDataURL("image/png"); var mmmd=getBase64Image(document.getElementById("mmm")); var data=imgData.substr(22); console.log(mmmd) debugger $.post('recorder/target/sc',{'sj':data}); }); function getBase64Image(img) { var canvastemp = document.createElement("canvas"); canvastemp.width = img.width; canvastemp.height = img.height; var ctx = canvas.getContext("2d"); ctx.drawImage(img, 0, 0, img.width, img.height); var dataURL = canvas.toDataURL("image/png"); return dataURL // return dataURL.replace("data:image/png;base64,", "");
 } </script>
</html>

三、對於IE瀏覽器必須採用jquery-webcam實現，由於IE對H5的標籤實現的很差css

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta charset="utf-8">
<title>jQuery-webcam-master</title>
<script src="js/jquery-1.8.3.min.js"></script>
<script type="text/javascript" src="js/jquery.webcam.js"></script>
<style type="text/css"> #webcam { border: 1px solid #666666; width: 320px; height: 240px; } #photos { border: 1px solid #666666; width: 320px; height: 240px; } .btn { width: 320px; height: auto; margin: 5px 0px; } .btn input[type=button] { width: 150px; height: 50px; line-height: 50px; margin: 3px; } </style>

</head>
<body>
<input type="button" value="show" id="showBtn" onclick="init();" />
<input type="button" value="close" id="closeBtn" onclick="destroy();" />
    <div id="webcam"></div>

    <div class="btn">
        <input type="button" value="登陸" id="saveBtn" onclick="action('old');" disabled="disabled"/>
        <a href="http://localhost:8088/AipFaceSys/webcam.jsp">跳轉</a>
    </div>
</body>


<script type="text/javascript"> function init(){ var pos = 0, ctx = null, saveCB, image = []; //建立畫布指定寬度和高度
    var root = document.getElementById("webcam"); if(root.firstChild){ root.removeChild(root.firstChild); } var canvas = document.createElement("canvas"); canvas.setAttribute('width', 320); canvas.setAttribute('height', 240); //若是畫布成功建立
if (canvas.toDataURL) { //設置畫布爲2d，將來可能支持3d
    ctx = canvas.getContext("2d"); //截圖320*240，即整個畫布做爲有效區(cutx?)
    image = ctx.getImageData(0, 0, 320, 240); saveCB = function(data) { //把data切割爲數組
        var col = data.split(";"); var img = image; //繪製圖像(這裏不是很理解算法) //參數data 只是每行的數據 ，例如320*240 大小的照片，一張完整的照片下來須要240個data，每一個data有320個rgb
        for (var i = 0; i < 320; i++) { //轉換爲十進制
            var tmp = parseInt(col[i]); img.data[pos + 0] = (tmp >> 16) & 0xff; img.data[pos + 1] = (tmp >> 8) & 0xff; img.data[pos + 2] = tmp & 0xff; img.data[pos + 3] = 0xff; pos += 4; } //當繪製320*240像素的圖片時發給後端php
        if (pos >= 4 * 320 * 240) { //把圖像放到畫布上,輸出爲png格式
            ctx.putImageData(img, 0, 0); //alert('圖片保存成功');
 $.ajax({ url : 'login.do?method=old', type : "POST", dataType : 'json', async : false, data : {image : canvas.toDataURL("image/png")}, success : function(data) { alert(data.flag+'---'+data.message); //webcam = null;
 }, error : function(error) { tip('訪問數據異常', '異常提示'); return true; } }); pos = 0; } }; } $("#webcam").webcam({ width : 320, height : 240, mode : "callback", swffile : "js/jscam.swf", onTick : function(remain) { if (0 == remain) { jQuery("#status").text("Cheese!"); } else { jQuery("#status").text(remain + " seconds remaining..."); } }, onSave : saveCB, onCapture : function() { webcam.save(); }, onPauseCamera : function() { webcam.pauseCamera(); }, debug : function(type, string) { console.log(type + ": " + string); } }); //初始化以後，登陸按鈕纔可用
$("#saveBtn").removeAttr("disabled"); } //拍照
    var method = 'login'; function action(action) { if(action != null){ method = action; } webcam.capture(); } function destroy(){ webcam.pauseCamera(); } </script>

</html>

當前，對於以上代碼中的關閉攝像頭的方法，webcam源文件中是存在pauseCamera方法的，只是官網提供的webcam.swf文件中，沒有集成該方法，咱們須要從新編譯該文件，html

具體的編譯方法，參考博文：http://www.javashuo.com/article/p-xifzpmjl-hx.htmljava

以上實現，只是簡易整理，若是須要用到從新編譯webcam.swf文件的方法，或者三方工具，請留言！ jquery