Tesseract OSD_example.cpp

// 參照 Tesseract API for VS2017

// 決定頁面，行到行，字到字 的方向

#include "pch.h"
#include <iostream>

#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main()
{
// 頁面方向
static const char* const sOrientation[] {
"PAGE_UP",
"PAGE_RIGHT",
"PAGE_DOWN",
"PAGE_LEFT",
};
// 字到字的方向
static const char* const sWritingDirection[] {
"LEFT_TO_RIGHT",
"RIGHT_TO_LEFT",
"TOP_TO_BOTTOM",
};
// 行到行的方向
static const char* const sTextlineOrder[]{
"LEFT_TO_RIGHT",
"RIGHT_TO_LEFT",
"TOP_TO_BOTTOM",
};

Pix *image = pixRead("D:\\TensorFlow\\OCR\\aaa.png");
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
if (api->Init(NULL, "eng")) {
std::cerr << "Could not initialize tesseract.\n";
}
api->SetPageSegMode(tesseract::PSM_AUTO_OSD);
api->SetImage(image);
api->Recognize(0);
tesseract::PageIterator* it = api->AnalyseLayout();
tesseract::PageIteratorLevel level = tesseract::RIL_WORD;
if (it != 0) {
do {
tesseract::Orientation orientation;
tesseract::WritingDirection direction;
tesseract::TextlineOrder order;
float deskew_angle;

it->Orientation(&orientation, &direction, &order, &deskew_angle);
printf("Orientation: %s;\nWritingDirection: %s\nTextlineOrder: %s\n" \
"Deskew angle: %.4f\n",
sOrientation[orientation], sWritingDirection[direction],
sTextlineOrder[order], deskew_angle);
int left, top, right, bottom;
it->BoundingBox(level, &left, &top, &right, &bottom);
printf("BoundingBox: (%d, %d) (%d, %d)\n",
left, top, right, bottom);
} while (it->Next(level));
}

api->End();
pixDestroy(&image);
}