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Merged
merged 2 commits into from
Sep 6, 2019
Merged

Lstm choice ril #2635

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e8b9c10
Clean up lstm_choice_mode and cut it down to 2 modes instead of 4
noahmetzger Jul 22, 2019
c350077
Made the lstm_choice mode compatible with the hocr_char_boxes mode
noahmetzger Jul 31, 2019
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145 changes: 75 additions & 70 deletions src/api/hocrrenderer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -133,7 +133,7 @@ char* TessBaseAPI::GetHOCRText(ETEXT_DESC* monitor, int page_number) {
if (tesseract_ == nullptr || (page_res_ == nullptr && Recognize(monitor) < 0))
return nullptr;

int lcnt = 1, bcnt = 1, pcnt = 1, wcnt = 1, scnt = 1, tcnt = 1, gcnt = 1;
int lcnt = 1, bcnt = 1, pcnt = 1, wcnt = 1, scnt = 1, tcnt = 1, ccnt = 1;
int page_id = page_number + 1; // hOCR uses 1-based page numbers.
bool para_is_ltr = true; // Default direction is LTR
const char* paragraph_lang = nullptr;
Expand Down Expand Up @@ -230,20 +230,14 @@ char* TessBaseAPI::GetHOCRText(ETEXT_DESC* monitor, int page_number) {

// Now, process the word...
int32_t lstm_choice_mode = tesseract_->lstm_choice_mode;
std::vector<std::vector<std::pair<const char*, float>>>* rawTimestepMap =
nullptr;
std::vector<std::vector<std::pair<const char*, float>>>* choiceMap =
std::vector<std::vector<std::vector<std::pair<const char*, float>>>>* rawTimestepMap =
nullptr;
std::vector<std::vector<std::pair<const char*, float>>>* CTCMap =
nullptr;
std::vector<std::vector<std::vector<std::pair<const char*, float>>>>*
symbolMap = nullptr;
if (lstm_choice_mode) {

choiceMap = res_it->GetBestLSTMSymbolChoices();
symbolMap = res_it->GetSegmentedLSTMTimesteps();
CTCMap = res_it->GetBestLSTMSymbolChoices();
rawTimestepMap = res_it->GetRawLSTMTimesteps();
CTCMap = res_it->GetBestCTCSymbolChoices();
}
hocr_str << "\n <span class='ocrx_word'"
<< " id='"
Expand Down Expand Up @@ -302,51 +296,89 @@ char* TessBaseAPI::GetHOCRText(ETEXT_DESC* monitor, int page_number) {
hocr_str << HOcrEscape(grapheme.get()).c_str();
if (hocr_boxes) {
hocr_str << "</span>";
tesseract::ChoiceIterator ci(*res_it);
if (lstm_choice_mode == 1 && ci.Timesteps() != nullptr) {
std::vector<std::vector<std::pair<const char*, float>>>* symbol =
ci.Timesteps();
hocr_str << "\n <span class='ocr_symbol'"
<< " id='"
<< "symbol_" << page_id << "_" << wcnt << "_" << scnt
<< "'>";
for (auto timestep : *symbol) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "timestep" << page_id << "_" << wcnt << "_" << tcnt
<< "'>";
for (auto conf : timestep) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << ccnt
<< "'"
<< " title='x_confs " << int(conf.second * 100)
<< "'>" << HOcrEscape(conf.first).c_str()
<< "</span>";
++ccnt;
}
hocr_str << "</span>";
++tcnt;
}
hocr_str << "\n </span>";
++scnt;
} else if (lstm_choice_mode == 2) {
tesseract::ChoiceIterator ci(*res_it);
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "lstm_choices_" << page_id << "_" << wcnt << "_" << tcnt
<< "'>";
do {
const char* choice = ci.GetUTF8Text();
float choiceconf = ci.Confidence();
if (choice != nullptr) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << ccnt
<< "'"
<< " title='x_confs " << choiceconf << "'>"
<< HOcrEscape(choice).c_str() << "</span>";
ccnt++;
}
} while (ci.Next());
hocr_str << "\n </span>";
tcnt++;
}
}
}
res_it->Next(RIL_SYMBOL);
} while (!res_it->Empty(RIL_BLOCK) && !res_it->IsAtBeginningOf(RIL_WORD));
if (italic) hocr_str << "</em>";
if (bold) hocr_str << "</strong>";
// If the lstm choice mode is required it is added here
if (lstm_choice_mode == 1 && rawTimestepMap != nullptr) {
for (auto timestep : *rawTimestepMap) {
hocr_str << "\n <span class='ocrx_cinfo'"
if (lstm_choice_mode == 1 && !hocr_boxes && rawTimestepMap != nullptr) {
for (auto symbol : *rawTimestepMap) {
hocr_str << "\n <span class='ocr_symbol'"
<< " id='"
<< "timestep_" << page_id << "_" << wcnt << "_" << tcnt << "'"
<< ">";
for (std::pair<const char*, float> conf : timestep) {
hocr_str << "<span class='ocr_glyph'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << gcnt << "'"
<< " title='x_confs " << int(conf.second * 100) << "'>"
<< HOcrEscape(conf.first).c_str() << "</span>";
gcnt++;
}
hocr_str << "</span>";
tcnt++;
}
} else if (lstm_choice_mode == 2 && choiceMap != nullptr) {
for (auto timestep : *choiceMap) {
if (timestep.size() > 0) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< "symbol_" << page_id << "_" << wcnt << "_" << scnt << "'>";
for (auto timestep : symbol) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "lstm_choices_" << page_id << "_" << wcnt << "_" << tcnt
<< "timestep" << page_id << "_" << wcnt << "_" << tcnt
<< "'>";
for (auto & j : timestep) {
hocr_str << "<span class='ocr_glyph'"
for (auto conf : timestep) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << gcnt
<< "choice_" << page_id << "_" << wcnt << "_" << ccnt
<< "'"
<< " title='x_confs " << int(j.second * 100)
<< "'>" << HOcrEscape(j.first).c_str() << "</span>";
gcnt++;
<< " title='x_confs " << int(conf.second * 100) << "'>"
<< HOcrEscape(conf.first).c_str() << "</span>";
++ccnt;
}
hocr_str << "</span>";
tcnt++;
++tcnt;
}
hocr_str << "</span>";
++scnt;
}
} else if (lstm_choice_mode == 4) {
} else if (lstm_choice_mode == 2 && !hocr_boxes && CTCMap != nullptr) {
for (auto timestep : *CTCMap) {
if (timestep.size() > 0) {
hocr_str << "\n <span class='ocrx_cinfo'"
Expand All @@ -359,53 +391,26 @@ char* TessBaseAPI::GetHOCRText(ETEXT_DESC* monitor, int page_number) {
conf = 0.0f;
if (conf > 100.0f)
conf = 100.0f;
hocr_str << "<span class='ocr_glyph'"
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << gcnt
<< "choice_" << page_id << "_" << wcnt << "_" << ccnt
<< "'"
<< " title='x_confs " << conf << "'>"
<< HOcrEscape(j.first).c_str() << "</span>";
gcnt++;
ccnt++;
}
hocr_str << "</span>";
tcnt++;
}
}
} else if (lstm_choice_mode == 3 && symbolMap != nullptr) {
for (auto timesteps : *symbolMap) {
hocr_str << "\n <span class='ocr_symbol'"
<< " id='"
<< "symbol_" << page_id << "_" << wcnt << "_" << scnt
<< "'>";
for (auto timestep : timesteps) {
hocr_str << "\n <span class='ocrx_cinfo'"
<< " id='"
<< "timestep_" << page_id << "_" << wcnt << "_" << tcnt
<< "'"
<< ">";
for (std::pair<const char*, float> conf : timestep) {
hocr_str << "<span class='ocr_glyph'"
<< " id='"
<< "choice_" << page_id << "_" << wcnt << "_" << gcnt
<< "'"
<< " title='x_confs " << int(conf.second * 100) << "'>"
<< HOcrEscape(conf.first).c_str() << "</span>";
gcnt++;
}
hocr_str << "</span>";
tcnt++;
}
hocr_str << "</span>";
scnt++;
}
}
}
// Close ocrx_word.
if (hocr_boxes || lstm_choice_mode > 0) {
hocr_str << "\n ";
}
hocr_str << "</span>";
tcnt = 1;
gcnt = 1;
ccnt = 1;
wcnt++;
// Close any ending block/paragraph/textline.
if (last_word_in_line) {
Expand Down
2 changes: 1 addition & 1 deletion src/ccmain/linerec.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -240,7 +240,7 @@ void Tesseract::LSTMRecognizeWord(const BLOCK& block, ROW *row, WERD_RES *word,
lstm_recognizer_->RecognizeLine(*im_data, true, classify_debug_level > 0,
kWorstDictCertainty / kCertaintyScale,
word_box, words, lstm_choice_mode,
lstm_choice_amount);
lstm_choice_iterations);
delete im_data;
SearchWords(words);
}
Expand Down
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