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<h1>光学字符识别(OCR)算法</h1> |
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<article class="bd-article"> |
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<section id="ocr"> |
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<span id="algorithm-ocr"></span><h1>光学字符识别(OCR)算法<a class="headerlink" href="#ocr" title="Link to this heading">#</a></h1> |
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<section id="id1"> |
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<h2>简介<a class="headerlink" href="#id1" title="Link to this heading">#</a></h2> |
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<p>光学字符识别(OCR)是指对图片中的文字块进行检测和识别。</p> |
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</section> |
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<section id="id2"> |
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<h2>模型使用<a class="headerlink" href="#id2" title="Link to this heading">#</a></h2> |
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<p>在配置好环境的情况下，直接执行 <code class="docutils literal notranslate"><span class="pre">scripts/ocr.py</span></code> 即可运行OCR算法脚本。</p> |
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$<span class="w"> </span>python<span class="w"> </span>scripts/ocr.py<span class="w"> </span>--config<span class="w"> </span>configs/ocr.yaml |
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</pre></div> |
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</div> |
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<section id="id3"> |
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<h3>模型配置<a class="headerlink" href="#id3" title="Link to this heading">#</a></h3> |
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<div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">inputs</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">assets/demo/ocr</span> |
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<span class="nt">outputs</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">outputs/ocr</span> |
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<span class="nt">visualize</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">True</span> |
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<span class="nt">tasks</span><span class="p">:</span> |
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<span class="w"> </span><span class="nt">ocr</span><span class="p">:</span> |
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<span class="w"> </span><span class="nt">model</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ocr_ppocr</span> |
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<span class="w"> </span><span class="nt">model_config</span><span class="p">:</span> |
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<span class="w"> </span><span class="nt">lang</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ch</span> |
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<span class="w"> </span><span class="nt">show_log</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">True</span> |
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<span class="w"> </span><span class="nt">det_model_dir</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">models/OCR/PaddleOCR/det/ch_PP-OCRv4_det</span> |
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<span class="w"> </span><span class="nt">rec_model_dir</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">models/OCR/PaddleOCR/rec/ch_PP-OCRv4_rec</span> |
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<span class="w"> </span><span class="nt">det_db_box_thresh</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0.3</span> |
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</pre></div> |
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</div> |
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<ul class="simple"> |
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<li><p>inputs/outputs: 分别定义输入文件路径和输出路径</p></li> |
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<li><p>visualize: 是否对模型结果进行可视化，可视化结果会保存在outputs目录下。</p></li> |
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<li><p>tasks: 定义任务类型，当前只包含一个OCR任务</p></li> |
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<li><p>model: 定义具体模型类型, 当前仅提供PaddleOCR模型</p></li> |
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<li><p>model_config: 定义模型配置</p></li> |
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<li><p>lang: 定义语种，默认语种ch支持中英文文字的检测和识别</p></li> |
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<li><p>show_log: 是否打印检测识别过程的日志</p></li> |
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<li><p>det_model_dir: 定义PaddleOCR检测模型的路径，指定路径不存在时，会自动下载模型权重到该路径</p></li> |
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<li><p>rec_model_dir: 定义PaddleOCR识别模型的路径，指定路径不存在时，会自动下载模型权重到该路径</p></li> |
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<li><p>det_db_box_thresh: 检测框筛选阈值，置信度低于该阈值的框会被舍弃</p></li> |
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</ul> |
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</section> |
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<section id="id4"> |
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<h3>多样化输入支持<a class="headerlink" href="#id4" title="Link to this heading">#</a></h3> |
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<p>PDF-Extract-Kit中的OCR脚本支持 <code class="docutils literal notranslate"><span class="pre">单个图像/PDF文件</span></code> 、 <code class="docutils literal notranslate"><span class="pre">包含图像/PDF文件的目录</span></code> 等输入形式。</p> |
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</section> |
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<section id="id5"> |
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<h3>可视化结果查看<a class="headerlink" href="#id5" title="Link to this heading">#</a></h3> |
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<p>当config文件中 <code class="docutils literal notranslate"><span class="pre">visualize</span></code> 设置为 <code class="docutils literal notranslate"><span class="pre">True</span></code> 时，可视化结果会保存在 <code class="docutils literal notranslate"><span class="pre">outputs</span></code> 参数指定的目录下。</p> |
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<div class="admonition note"> |
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<p class="admonition-title">备注</p> |
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<p>可视化可以方便对模型结果进行分析，但当进行大批量任务时，建议关掉可视化(设置 <code class="docutils literal notranslate"><span class="pre">visualize</span></code> 为 <code class="docutils literal notranslate"><span class="pre">False</span></code> )，减少内存和磁盘占用。</p> |
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</div> |
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</section> |
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