android - 字符/单词的坐标[OCR应用]

Question

因此，基本上，我正在创建一个android应用程序(使用tesseract和OpenCV)，当在预处理和扫描步骤后给定单词时，在该单词周围绘制一个矩形-基本上是“查找”该单词并将其标记出来。但是我想知道如何获取角色的坐标？还是至少一个字？我有每行的坐标，但是这些坐标不是相对于“主画面”的坐标，而是相对于我拥有的“文本块”的坐标。也许有人拥有/知道解释/教程或某种有关如何找到单词/字符坐标的信息。高度赞赏。

Answer 1

此示例代码来自tesseract的API Examples Wiki页面，应有助于:
APIExamples

专注于这两行:int x1, y1, x2, y2;
ri->BoundingBox(level, &x1, &y1, &x2, &y2);

Pix *image = pixRead("/usr/src/tesseract/testing/phototest.tif");
tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
api->Init(NULL, "eng");
api->SetImage(image);
api->SetVariable("save_blob_choices", "T");
api->SetRectangle(37, 228, 548, 31);
api->Recognize(NULL);

tesseract::ResultIterator* ri = api->GetIterator();
tesseract::PageIteratorLevel level = tesseract::RIL_SYMBOL;
if(ri != 0) {
  do {
      const char* symbol = ri->GetUTF8Text(level);
      float conf = ri->Confidence(level);
      int x1, y1, x2, y2;
      ri->BoundingBox(level, &x1, &y1, &x2, &y2);
      if(symbol != 0) {
          printf("symbol %s, conf: %f", symbol, conf);
          bool indent = false;
          tesseract::ChoiceIterator ci(*ri);
          do {
              if (indent) printf("\t\t ");
              printf("\t- ");
              const char* choice = ci.GetUTF8Text();
              printf("%s conf: %f\n", choice, ci.Confidence());
              indent = true;
          } while(ci.Next());
      }
      printf("---------------------------------------------\n");
      delete[] symbol;
  } while((ri->Next(level)));
}