字符/单词的坐标 [OCR 应用程序]

Question

所以基本上，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出一个单词时，会在该单词周围绘制一个矩形 - 基本上"找到"单词并标记它。但是我想知道如何获取角色的坐标？或者至少一个词？我有每条线的坐标，但坐标不是相对于"主图"的，而只是我拥有的"文本块"的坐标。也许有人有/知道解释/教程或某种关于如何查找单词/字符坐标的信息。将不胜感激。

Answer 1

此示例代码取自 tesseract 的 API 示例 Wiki 页面，应该会有所帮助： APIExamples

专注于这 2 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("tt ");
printf("t- ");
const char* choice = ci.GetUTF8Text();
printf("%s conf: %fn", choice, ci.Confidence());
indent = true;
} while(ci.Next());
}
printf("---------------------------------------------n");
delete[] symbol;
} while((ri->Next(level)));
}