更多：http://www.webyang.net/Html/web/article_161.html
OCR的百度定義（Optical Character Recognition，光學字元辨識）是指電子設備（例如掃描器或數位相機）檢查紙上列印的字符，透過檢測暗、亮的模式確定其形狀，然後用字符識別方法將形狀翻譯成計算機文字的過程；即，針對印刷體字符，採用光學的方式將紙質文檔中的文字轉換成為黑白點陣的圖像文件，並透過識別軟體將圖像中的文字轉換成文字格式，供文字處理軟體進一步編輯加工的技術。
作為一個工程師，在實際程式設計中，可能需要把圖片中的文字顯示出來，這就需要用到ocr技術。因為php開發，所以優先選擇php，找了php的ocr擴充測試了下，結果發現不可用（網址：http://sourceforge.net/projects/phpocr.berlios）？網路上也看了很多朋友的demo，基本上原理都是對圖片分解成0，1矩陣，然後根據特徵，轉換成對應的字串。測試幾個都是不可行的。然後看到別人說PHP搞OCR的很少，也不適合，語言效率太低，這種演算法需要很高的效率。可以嘗試C,MATLAB
等的OCR演算法。搞matlab的玩OCR這類偏演算法的很多。
無奈才虛學淺，不會C。無意中卻發現百度有ocr的api提供：http://apistore.baidu.com/apiworks/servicedetail/146.html。
寫了個玩下：
<ol>
<li value="1">
<span><?</span><span>php</span>
</li>
<li>
<span>header</span><span>(</span><span>"Content-type: text/html; charset=utf-8"</span><span>);</span>
</li>
<li><span> </span></li>
<li>
<span>function</span><span> curl</span><span>(</span><span>$img</span><span>)</span><span></span><span>{</span>
</li>
<li><span> </span></li>
<li>
<span> $ch </span><span>=</span><span> curl_init</span><span>();</span>
</li>
<li>
<span> $url </span><span>=</span><span></span><span>'http://apis.baidu.com/apistore/idlocr/ocr'</span><span>;</span><span></span><span>//百度ocr api</span>
</li>
<li>
<span> $header </span><span>=</span><span> array</span><span>(</span>
</li>
<li>
<span></span><span>'Content-Type:application/x-www-form-urlencoded'</span><span>,</span>
</li>
<li>
<span></span><span>'apikey:69c2ace1ef297ce88869f0751cb1b618'</span><span>,</span>
</li>
<li>
<span></span><span>);</span>
</li>
<li><span> </span></li>
<li>
<span> $data_temp </span><span>=</span><span> file_get_contents</span><span>(</span><span>$img</span><span>);</span>
</li>
<li>
<span> $data_temp </span><span>=</span><span> urlencode</span><span>(</span><span>base64_encode</span><span>(</span><span>$data_temp</span><span>));</span>
</li>
<li>
<span></span><span>//封装必要参数</span>
</li>
<li>
<span> $data </span><span>=</span><span></span><span>"fromdevice=pc&clientip=127.0.0.1&detecttype=LocateRecognize&languagetype=CHN_ENG&imagetype=1&image="</span><span>.</span><span>$data_temp</span><span>;</span>
</li>
<li><span></span></li>
<li>
<span> curl_setopt</span><span>(</span><span>$ch</span><span>,</span><span> CURLOPT_HTTPHEADER </span><span>,</span><span> $header</span><span>);</span><span></span><span>// 添加apikey到header</span>
</li>
<li>
<span> curl_setopt</span><span>(</span><span>$ch</span><span>,</span><span> CURLOPT_POST</span><span>,</span><span></span><span>1</span><span>);</span>
</li>
<li>
<span> curl_setopt</span><span>(</span><span>$ch</span><span>,</span><span> CURLOPT_POSTFIELDS</span><span>,</span><span> $data</span><span>);</span><span></span><span>// 添加参数</span>
</li>
<li>
<span> curl_setopt</span><span>(</span><span>$ch</span><span>,</span><span> CURLOPT_RETURNTRANSFER</span><span>,</span><span></span><span>1</span><span>);</span>
</li>
<li>
<span> curl_setopt</span><span>(</span><span>$ch </span><span>,</span><span> CURLOPT_URL </span><span>,</span><span> $url</span><span>);</span><span></span><span>// 执行HTTP请求</span>
</li>
<li>
<span> $res </span><span>=</span><span> curl_exec</span><span>(</span><span>$ch</span><span>);</span>
</li>
<li>
<span></span><span>if</span><span></span><span>(</span><span>$res </span><span>===</span><span> FALSE</span><span>)</span><span></span><span>{</span>
</li>
<li>
<span> echo </span><span>"cURL Error: "</span><span></span><span>.</span><span> curl_error</span><span>(</span><span>$ch</span><span>);</span>
</li>
<li>
<span></span><span>}</span>
</li>
<li>
<span> curl_close</span><span>(</span><span>$ch</span><span>);</span>
</li>
<li><span></span></li>
<li>
<span> $temp_var </span><span>=</span><span> json_decode</span><span>(</span><span>$res</span><span>,</span><span>true</span><span>);</span>
</li>
<li>
<span></span><span>return</span><span> $temp_var</span><span>;</span>
</li>
<li><span> </span></li>
<li><span>}</span></li>
<li><span> </span></li>
<li>
<span>$wordArr </span><span>=</span><span> curl</span><span>(</span><span>'4.jpg'</span><span>);</span>
</li>
<li>
<span>if</span><span>(</span><span>$wordArr</span><span>[</span><span>'errNum'</span><span>]</span><span></span><span>==</span><span></span><span>0</span><span>)</span><span></span><span>{</span>
</li>
<li>
<span> var_dump</span><span>(</span><span>$wordArr</span><span>);</span>
</li>
<li>
<span>}</span><span></span><span>else</span><span></span><span>{</span>
</li>
<li>
<span> echo </span><span>"识别出错:"</span><span>.</span><span>$wordArr</span><span>[</span><span>"errMsg"</span><span>];</span>
</li>
<li><span>}</span></li>
</ol>登入後複製
測試了幾張圖片，準確度還蠻高的。百分之百的話，是不切實際的~
版權聲明：本文為博主原創文章，未經博主允許不得轉載。
以上就介紹了php實作ocr文字識別，包括了方面的內容，希望對PHP教學有興趣的朋友有幫助。
