Javanese script training

src/training/language-specific.sh

@@ -22,7 +22,7 @@ VALID_LANGUAGE_CODES="afr amh ara asm aze aze_cyrl bel ben bih bod bos bul cat
                       ceb ces chi_sim chi_tra chr cym cyr_lid dan deu div dzo
                       ell eng enm epo est eus fas fil fin fra frk frm gle glg
                       grc guj hat heb hin hrv hun hye iast iku ind isl ita ita_old
-                      jav jpn kan kat kat_old kaz khm kir kor kur lao lat
+                      jav jav_java jpn kan kat kat_old kaz khm kir kor kur lao lat
                       lat_lid lav lit mal mar mkd mlt msa mya nep nld nor ori
                       pan pol por pus ron rus san sin slk slv snd spa spa_old
                       sqi srp srp_latn swa swe syr tam tel tgk tgl tha tir tur
@@ -604,6 +604,10 @@ BURMESE_FONTS=( \
     "TharLon" \
     )
 	
+JAVANESE_FONTS=( \
+    "Prada" \
+    )
+
 NORTH_AMERICAN_ABORIGINAL_FONTS=( \
     "Aboriginal Sans" \
     "Aboriginal Sans Bold Italic" \
@@ -1065,6 +1069,10 @@ set_lang_specific_parameters() {
           test -z "$FONTS" && FONTS=( "${TELUGU_FONTS[@]}" ) ;;
 
     # SouthEast Asian scripts.
+    jav_java ) MEAN_COUNT="15"
+          WORD_DAWG_FACTOR=0.15
+          TRAINING_DATA_ARGUMENTS+=" --infrequent_ratio=10000"
+          test -z "$FONTS" && FONTS=( "${JAVANESE_FONTS[@]}" ) ;;
     khm ) MEAN_COUNT="15"
           WORD_DAWG_FACTOR=0.15
           TRAINING_DATA_ARGUMENTS+=" --infrequent_ratio=10000"
@@ -1172,7 +1180,7 @@ set_lang_specific_parameters() {
       LANG_IS_RTL="1"
       NORM_MODE="2" ;;
     asm | ben | bih | hin | mar | nep | guj | kan | mal | tam | tel | pan | \
-    dzo | sin | san | bod | ori | khm | mya | tha | lao | jav )
+    dzo | sin | san | bod | ori | khm | mya | tha | lao | jav  | jav_java)
       LANG_IS_RTL="0"
       NORM_MODE="2" ;;
     * )

src/training/tesstrain.sh

@@ -61,7 +61,7 @@ initialize_fontconfig
 phase_I_generate_image 8
 phase_UP_generate_unicharset
 if ((LINEDATA)); then
-  phase_E_extract_features "lstm.train" 8 "lstmf"
+  phase_E_extract_features " --psm 6  lstm.train " 8 "lstmf"
   make__lstmdata
   tlog "\nCreated starter traineddata for language '${LANG_CODE}'\n"
   tlog "\nRun lstmtraining to do the LSTM training for language '${LANG_CODE}'\n"

src/training/tesstrain_utils.sh

@@ -23,6 +23,7 @@ else
     FONTS_DIR="/usr/share/fonts/"
     FONT_CONFIG_CACHE=$(mktemp -d --tmpdir font_tmp.XXXXXXXXXX)
 fi
+MAX_PAGES=0
 OUTPUT_DIR="/tmp/tesstrain/tessdata"
 OVERWRITE=0
 LINEDATA=0
@@ -130,6 +131,9 @@ parse_flags() {
             --langdata_dir)
                 parse_value "LANGDATA_ROOT" ${ARGV[$j]}
                 i=$j ;;
+            --maxpages)
+                parse_value "MAX_PAGES" ${ARGV[$j]}
+                i=$j ;;
             --output_dir)
                 parse_value "OUTPUT_DIR" ${ARGV[$j]}
                 i=$j ;;
@@ -221,7 +225,7 @@ generate_font_image() {
     common_args+=" --fonts_dir=${FONTS_DIR} --strip_unrenderable_words"
     common_args+=" --leading=${LEADING}"
     common_args+=" --char_spacing=${CHAR_SPACING} --exposure=${EXPOSURE}"
-    common_args+=" --outputbase=${outbase} --max_pages=0"
+    common_args+=" --outputbase=${outbase} --max_pages=${MAX_PAGES}"
 
     # add --writing_mode=vertical-upright to common_args if the font is
     # specified to be rendered vertically.
@@ -246,7 +250,6 @@ generate_font_image() {
     fi
 }
 
-
 # Phase I : Generate (I)mages from training text for each font.
 phase_I_generate_image() {
     local par_factor=$1

src/training/validate_indic.cpp

@@ -65,7 +65,7 @@ Validator::CharClass ValidateIndic::UnicodeToCharClass(char32 ch) const {
       return CharClass::kConsonant;
     // Sinhala doesn't have Nukta or Avagraha.
     if (off == 0x3c) return CharClass::kNukta;
-    if (off == 0x3d) return CharClass::kVowel;
+    if (off == 0x3d) return CharClass::kVowel; // avagraha
     if (off <= 0x4c || (0x51 <= off && off <= 0x54)) return CharClass::kMatra;
     if (0x55 <= off && off <= 0x57) return CharClass::kMatraPiece;
     if (off == 0x4d) return CharClass::kVirama;

src/training/validate_javanese.cpp

@@ -26,12 +26,13 @@ namespace tesseract {
 // Taken from unicode standard:
 // http://www.unicode.org/charts/PDF/UA980.pdf
 // http://www.unicode.org/versions/Unicode11.0.0/ch17.pdf
+// The Consonant class here includes independent vowels.
 // The order of components in an orthographic syllable as expressed in BNF is:
 // {C F} C {{R}Y} {V{A}} {Z}
 // Translated to the codes used by the CharClass enum:
-// [(V|C[N])(H)] (V|C[N]) [[R]Y] [M[D]] [D]
-// Also the Consonant class here includes independent vowels, as they are
-// treated the same anyway.
+// [(V|C[N])(H)] (V|C[N]) [[N]N] [M[D]] [v]
+// Also see https://r12a.github.io/scripts/javanese/ for detailed notes.
+// Validation rules copied from validate_indic.cpp and modified for Javanese.
 // Indic - for reference
 //  + vowel Grapheme:  V[D](v)*
 //  + consonant Grapheme: (C[N](H|HZ|Hz|ZH)?)*C[N](H|Hz)?[M[P]][D](v)*
@@ -63,7 +64,6 @@ bool ValidateJavanese::ConsumeGraphemeIfValid() {
 }
 
 Validator::CharClass ValidateJavanese::UnicodeToCharClass(char32 ch) const {
-  if (IsVedicAccent(ch)) return CharClass::kVedicMark;
   if (ch == kZeroWidthNonJoiner) return CharClass::kZeroWidthNonJoiner;
   if (ch == kZeroWidthJoiner) return CharClass::kZeroWidthJoiner;
   // Offset from the start of the relevant unicode code block aka code page.
@@ -74,6 +74,8 @@ Validator::CharClass ValidateJavanese::UnicodeToCharClass(char32 ch) const {
   if (off <= 0x32) return CharClass::kConsonant; // includes independent vowels
   if (off == 0x33) return CharClass::kNukta; // A9B3 CECAK TELU
   if (off == 0x34) return CharClass::kMatraPiece; // A9B4 TARUNG two part vowels
+  if (off <= 0x39) return CharClass::kMatra;
+  if (off <= 0x3a) return CharClass::kMatraPiece; // A9BA TALING 
   if (off <= 0x3d) return CharClass::kMatra;
   if (off <= 0x3f) return CharClass::kNukta; // A9BE-A9BF PENGKAL-CAKRA medial consonants
   if (off == 0x40) return CharClass::kVirama; // A9C0 PANGKON
@@ -229,6 +231,11 @@ bool ValidateJavanese::ConsumeConsonantTailIfValid() {
       if (UseMultiCode(1)) return true;
     }
   }
+  // Tarung also used for long versions of u and o vowels and vocalic r
+  // Taling + Tarung is valid eg. ꦏ + ◌ꦺ + ◌ꦴ
+  while (codes_[codes_used_].first == CharClass::kMatraPiece) {
+    if (UseMultiCode(1)) return true;
+  }
   while (codes_[codes_used_].first == CharClass::kVowelModifier) {
     if (UseMultiCode(1)) return true;
   }
@@ -260,4 +267,3 @@ bool ValidateJavanese::ConsumeVowelIfValid() {
 }
 
 }  // namespace tesseract
-