Leptonica --> tesseract --> OpenCV

最新推荐文章于 2025-06-23 10:52:03 发布

windtalkersm

最新推荐文章于 2025-06-23 10:52:03 发布

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分类专栏：算法备忘 OpenCV备忘 Windows备忘 OCR备忘 Tesseract备忘

本文链接：https://blog.youkuaiyun.com/windtalkersm/article/details/52304803

本文详细记录了在Windows上配置和使用Leptonica、Tesseract和OpenCV的过程，包括遇到的问题、解决方案和最终成功运行的步骤。内容涵盖库版本匹配、依赖问题、静态编译与动态链接的冲突，以及不同系统（如OS X和Windows）上的安装差异。特别提到了静态库和DLL的版本兼容性问题，以及OpenALPR在不同平台上的应用和调试。

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=== 26/05/2017更 ===

The static drawing function static void DisplayBoxVector [tabfind.cpp] does draw different colours other than ScrollView::WHITE depending on blob types

TabFind::FindInitialTabVectors gets called TWICE, hence produces two sets of debugging windows:

”VerticalLines”

“InitialTabs”

For 1st "InitialTabs" window, only white boxes are drawn via above DisplayBoxVector

For 2nd "InitialTabs" window, colour boxes will be drawn first, conforming to BLOBNBOX::TextlineColor colour scheme

For both cases, the box edges will be rendered based on Box Tab types

====================

The debugging window “Initial textline Blobs” is drawn through TextlineProjection::PlotGradedBlobs [textord/textlineprojection.cpp] ONLY

NOTE the difference between PlotGradedBlobs and TO_BLOCK::plot_graded_blobs

It ONLY has three colours:

ScrollView::YELLOW: UniquelyVertical

ScrollView::RED : bad_box after TextlineProjection::BoxOutOfHTextline

ScrollView::BLUE:

// Display the blobs in the window colored according to textline quality.
void TextlineProjection::PlotGradedBlobs(BLOBNBOX_LIST* blobs,
                                         ScrollView* win) {
#ifndef GRAPHICS_DISABLED
  BLOBNBOX_IT it(blobs);
  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
    BLOBNBOX* blob = it.data();
    const TBOX& box = blob->bounding_box();
    bool bad_box = BoxOutOfHTextline(box, NULL, false);
    if (blob->UniquelyVertical())
      win->Pen(ScrollView::YELLOW);
    else
      win->Pen(bad_box ? ScrollView::RED : ScrollView::BLUE);
    win->Rectangle(box.left(), box.bottom(), box.right(), box.top());
  }
  win->Update();
#endif  // GRAPHICS_DISABLED
}

=== 25/05/2017更 ===

The following debugging windows from StrokeWidth::FindInitialPartitions are using mixed colour scheme for displaying blobs

”Initial text chains”

“GoodTextline blobs”

“Diacritics”

“Smoothed blobs”

From template<class BBC, class BBC_CLIST, class BBC_C_IT> void BBGrid<BBC, BBC_CLIST, BBC_C_IT>::DisplayBoxes

Where BBC is initialised as ColPartition [textord/colpartition.cpp]

#ifndef GRAPHICS_DISABLED
// Provides a color for BBGrid to draw the rectangle.
// Must be kept in sync with PolyBlockType.
ScrollView::Color  ColPartition::BoxColor() const {
  if (type_ == PT_UNKNOWN)
    return BLOBNBOX::TextlineColor(blob_type_, flow_);
  return POLY_BLOCK::ColorForPolyBlockType(type_);
}
#endif  // GRAPHICS_DISABLED

=== 23/05/2017更 ===

#ifndef GRAPHICS_DISABLED
/// Returns a color to draw the given type.
ScrollView::Color POLY_BLOCK::ColorForPolyBlockType(PolyBlockType type) {
  // Keep kPBColors in sync with PolyBlockType.
  const ScrollView::Color kPBColors[PT_COUNT] = {
    ScrollView::WHITE,        // Type is not yet known. Keep as the 1st element.
    ScrollView::BLUE,         // Text that lives inside a column.
    ScrollView::CYAN,         // Text that spans more than one column.
    ScrollView::MEDIUM_BLUE,  // Text that is in a cross-column pull-out region.
    ScrollView::AQUAMARINE,   // Partition belonging to an equation region.
    ScrollView::SKY_BLUE,   // Partition belonging to an inline equation region.
    ScrollView::MAGENTA,      // Partition belonging to a table region.
    ScrollView::GREEN,        // Text-line runs vertically.
    ScrollView::LIGHT_BLUE,   // Text that belongs to an image.
    ScrollView::RED,          // Image that lives inside a column.
    ScrollView::YELLOW,       // Image that spans more t