Dealing with a font which is so heavily kerned (the technical term for the intercharacter spacing) is going to be difficult, I suspect.
One possibility might be to train the 74 combo as effectively a ligature and recognize it as single symbol, but I have no idea if a) you can invest this level of effort or b) whether it'll work. Tom p.s. There are also a number of kerning related parameters, but I've never played with them: $ tesseract --print-parameters | grep -E "kern|kn" tosp_redo_kern_limit 10 No.samples reqd to reestimate for row tosp_old_to_constrain_sp_kn 0 Constrain relative values of inter and intra-word gaps for old_to_method. tosp_only_small_gaps_for_kern 0 Better guess tosp_fuzzy_limit_all 1 Don't restrict kn->sp fuzzy limit to tables tosp_rule_9_test_punct 0 Don't chng kn to space next to punct tosp_flip_fuzz_kn_to_sp 1 Default flip tosp_flip_fuzz_sp_to_kn 1 Default flip tosp_old_sp_kn_th_factor 2 Factor for defining space threshold in terms of space and kern sizes tosp_threshold_bias1 0 how far between kern and space? tosp_threshold_bias2 0 how far between kern and space? tosp_gap_factor 0.83 gap ratio to flip sp->kern tosp_kern_gap_factor1 2 gap ratio to flip kern->sp tosp_kern_gap_factor2 1.3 gap ratio to flip kern->sp tosp_kern_gap_factor3 2.5 gap ratio to flip kern->sp tosp_enough_small_gaps 0.65 Fract of kerns reqd for isolated row stats tosp_table_kn_sp_ratio 2.25 Min difference of kn & sp in table tosp_table_fuzzy_kn_sp_ratio 3 Fuzzy if less than this tosp_fuzzy_kn_fraction 0.5 New fuzzy kn alg tosp_min_sane_kn_sp 1.5 Don't trust spaces less than this time kn tosp_init_guess_kn_mult 2.2 Thresh guess - mult kn by this tosp_max_sane_kn_thresh 5 Multiplier on kn to limit thresh tosp_flip_caution 0 Don't autoflip kn to sp when large separation tosp_large_kerning 0.19 Limit use of xht gap with large kns tosp_dont_fool_with_small_kerns -1 Limit use of xht gap with odd small kns tosp_silly_kn_sp_gap 0.2 Don't let sp minus kn get too small -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to tesseract-ocr+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/f8d6441b-73e4-400f-9bfc-885ea8396b66n%40googlegroups.com.
