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(*
process OCR on a pdf file;
requires:
- tesseract [depending on imagemagick and ghostscript]
- unpaper
- hocr2pdf (from ExactImage)
(C) 2010-2018 Tobias Elze, modified for tesseract Heinrich Schwietering 2012
patch for -rgb option contributed by James Cort
patch for a parallel computing problem with Tesseract 4, Dominique Meeus, 2018
*)
include Pdfsandwich_version;; (*provides string variable pdfsandwich_version*)
(*generate global temporary directory:*)
let global_temp_dir = Filename.temp_file "pdfsandwich_tmp" "";;
(*default binary names:*)
let unpaper = ref "unpaper";;
let identify = ref "identify";;
let convert = ref "convert";;
let tesseract = ref "tesseract";; (* this will be preceded by the OMP_THREAD_LIMIT (see options) *)
let pdfinfo = ref "pdfinfo";;
let pdfunite = ref "pdfunite";;
let hocr2pdf = ref "hocr2pdf";;
let gs = ref "gs";;
(*global flags:*)
let verbose = ref false;;
let quiet = ref false;;
(*print output, if verbose option is set (default)*)
let pr s =
if not !quiet then print_endline s
;;
let make_temp_file = Filename.temp_file ~temp_dir:global_temp_dir "pdfsandwich";;
(*execute command cmd and print it's invocation line (if verbose is set):*)
let run ?(crash=true) cmd =
if !verbose then pr cmd;
if Sys.command cmd <> 0 then
(
prerr_endline ("ERROR: Command \"" ^ cmd ^ "\" failed. ");
if crash then
(
prerr_endline ("Terminating pdfsandwich. All temporary files are kept.");
exit 2;
)
)
;;
(*check if binary bin exists (in search path):*)
let check_for_binary bin =
try
let in_ch = Unix.open_process_in ("which " ^ bin) in
let s = input_line in_ch in
if s = "" then failwith "";
ignore (Unix.close_process_in in_ch);
with _ -> failwith
("Could not find program "
^ bin
^ ". Make sure this program exists and can be found in your search path.\nUse command line options to specify a custom binary.")
;;
(*return number of pages of a PDF file; needs pdfinfo:*)
let number_of_pages filename =
try
let in_ch = Unix.open_process_in (!pdfinfo ^ " " ^ filename) in
let rec read_pdfinfo () =
let s = input_line in_ch in
if Str.string_match (Str.regexp "Pages:[^0-9]+\\([0-9]+\\)") s 0 then
(
ignore (Unix.close_process_in in_ch);
int_of_string (Str.matched_group 1 s);
)
else read_pdfinfo ()
in
read_pdfinfo ()
with _ -> failwith ("Error: pdfinfo could not determine number of pages. Check the pdf input file.\n")
;;
(*return number of CPUs:*)
let number_of_cpus () =
(*different code for different platforms;
runtime OS detection:*)
try
(match Sys.os_type with
| "Unix" ->
(
let scriptstring =
let p = Unix.open_process_in "uname" in
let os = input_line p in
ignore (Unix.close_process_in p);
match os with
| "Linux" -> "cat /proc/cpuinfo | grep processor | awk '{a++} END {print a}'"
| _ -> "sysctl -n hw.ncpu" (*works (at least) for Darwin, OpenBSD, and FreeBSD*)
in
let in_ch = Unix.open_process_in scriptstring in
let numstr = input_line in_ch in
ignore (Unix.close_process_in in_ch);
int_of_string numstr;
)
| _ -> failwith "Not yet implemented for Non-Unix systems.")
with _ -> 1
;;
(*process OCR on pdf file infile and save the results to outfile:*)
let process_ocr
infile
outfile
first_page last_page
resolution
rgb
gray
nthreads
language
convertopts
tessopts
hocropts
preprocess
unpaperopts
debug
enforcehocr2pdf
page_width_height
maxpixels =
let pages_to_process = last_page - first_page + 1 in
(*let hocr_resolution = Str.global_replace (Str.regexp "^\\(.+\\)x.*$") "\\1" resolution in*)
let hocr_resolution = Printf.sprintf "%i" resolution in
if nthreads > 1 then
pr ("\nParallel processing with " ^ (string_of_int nthreads) ^ " threads started.\nProcessing page order may differ from original page order.\n");
let process_page (curr_page, pdfname) =
let tmppicfile = make_temp_file (if rgb then ".ppm" else if gray then ".pgm" else ".pbm") in
let tmptessinpfile = make_temp_file ".tif" in
let tmpocrfile = make_temp_file "" in
let tmpcolfigfile = make_temp_file "_col.png" in
let tmprescaled_infile = make_temp_file "_rescaled.pdf" in
let tmpunpaperfile = make_temp_file ("_unpaper" ^ (if rgb then ".ppm" else if gray then ".pgm" else ".pbm")) in
if not !quiet then
Printf.printf "Processing page %i.\n" curr_page;
flush_all ();
(*get original height and width:*)
let (orig_height, orig_width) =
try
pr (!identify ^ " -format \"%w\\n%h\\n\" " ^ " \"" ^ infile ^ "[" ^ (string_of_int (curr_page-1)) ^ "]\" ");
let in_ch = Unix.open_process_in
(!identify ^ " -format \"%w\\n%h\\n\" " ^ " \"" ^ infile ^ "[" ^ (string_of_int (curr_page-1)) ^ "]\" ");
in
let w = input_line in_ch
and h = input_line in_ch in
ignore (Unix.close_process_in in_ch);
(int_of_string h, int_of_string w);
with _ -> (
prerr_endline "Warning: could not determine page size; defaulting to A4.";
(842,595) (*defaults to A4*))
in
let (height, width) = match page_width_height with
| None -> (orig_height, orig_width)
| Some x -> x
in
(*downscaling if resolution too large (requires gs):*)
let convert_infile =
let fw = float_of_int width
and fh = float_of_int height
and fm = float_of_int maxpixels in
let pixels = (((float_of_int resolution) /. 72.) ** 2.) *. fw *. fh in
let (new_height, new_width) =
if pixels > fm then
(
let mpix = fm /. (((float_of_int resolution) /. 72.) ** 2.) in
let k = fw /. fh in
let new_width = int_of_float (sqrt (k *. mpix)) in
let new_height = int_of_float ((sqrt mpix) /. (sqrt k)) in
Printf.eprintf
"\n\nWARNING: page size (%ix%i) of page %i together with resolution %i yields very large file which exceeds parameter maxpixels. Most probably, the input file was accidentally generated in an inappropriately hight resolution.\nThe input file is scaled down to %ix%i pixels instead.\nIf such a large input file is really required, set the command line option -maxpixels greater than %.0f instead.\n\n"
width height curr_page resolution new_width new_height pixels;
flush_all ();
(new_height, new_width)
)
else (height, width)
in
if (new_height <> orig_height || new_width <> orig_width) then
(
run (
Printf.sprintf
"%s -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dFirstPage=%i -dLastPage=%i -dDEVICEWIDTHPOINTS=%i -dDEVICEHEIGHTPOINTS=%i -dPDFFitPage -o %s %s"
!gs curr_page curr_page new_width new_height tmprescaled_infile infile);
tmprescaled_infile;
)
else
(infile ^ "[" ^ (string_of_int (curr_page-1)) ^ "]")
in
let convoptstmp =
if rgb then
" -depth 8 -background white -flatten -alpha Off -density "
else
if gray then " -colorspace gray -depth 8 -background white -flatten -alpha Off -density " else " -type Bilevel -density "
in
(*run (!convert ^ " -units PixelsPerInch " ^ convertopts ^ convoptstmp ^ (Printf.sprintf "%ix%i " resolution resolution) ^ " \"" ^ convert_infile ^ "\" " ^ tmppicfile);*)
run (!convert ^ " -units PixelsPerInch " ^ convoptstmp ^ (Printf.sprintf "%ix%i " resolution resolution) ^ convertopts ^ " \"" ^ convert_infile ^ "\" " ^ tmppicfile);
let tessout = if not !verbose then ">/dev/null 2>&1" else "" in
let preproc_output =
if preprocess then
(
run (!unpaper ^ " --overwrite " ^ unpaperopts ^ " " ^ tmppicfile ^ " " ^ tmpunpaperfile ^ tessout);
tmpunpaperfile
)
else tmppicfile
in
(*convert preprocessing output file to tif in order to ensure correct resolution and size:*)
let tessinputfile =
run (!convert ^ " -units PixelsPerInch -density " ^ (Printf.sprintf "%ix%i" resolution resolution) ^ " " ^ preproc_output ^ " " ^ tmptessinpfile );
tmptessinpfile
in
(*test if tesseract can output pdf files:*)
run (!tesseract ^ " " ^ tessinputfile ^ tessout ^ " " ^ tmpocrfile ^ " " ^ tessopts ^ " -l " ^ language ^ " pdf ");
if (not enforcehocr2pdf) && Sys.file_exists (tmpocrfile ^ ".pdf") then
(
if !verbose then pr ("OCR pdf generated. Renaming output file to " ^ pdfname ^ "\n");
Unix.rename (tmpocrfile ^ ".pdf") pdfname;
)
else
(
if not !quiet then
print_endline "Tesseract was unable to produce a pdf output file. Possibly, version of tesseract is prior to 3.03 and cannot output pdf yet. Using hocr2pdf instead.";
run (!tesseract ^ " " ^ tessinputfile ^ tessout ^ " " ^ tmpocrfile ^ " " ^ tessopts ^ " -l " ^ language ^ " hocr ");
let hocrinputfile = if Sys.file_exists (tmpocrfile ^ ".html") then tmpocrfile ^ ".html" else tmpocrfile ^ ".hocr" in
run (!hocr2pdf ^ hocropts ^ " -r " ^ hocr_resolution ^ " -i " ^ tessinputfile ^ " -o " ^ pdfname ^ "<" ^ hocrinputfile);
if not debug then Sys.remove hocrinputfile;
);
let rm_if_exists f = if Sys.file_exists f then Sys.remove f in
if not debug then
(
rm_if_exists (tmpocrfile ^ ".pdf");
rm_if_exists tmprescaled_infile;
rm_if_exists tmptessinpfile;
rm_if_exists tmppicfile;
rm_if_exists tmpocrfile;
rm_if_exists tmpcolfigfile;
rm_if_exists tmpunpaperfile;
);
in
let process_pagelist = Array.iter process_page in
let tmppdf_arr =
Array.init pages_to_process (fun i -> (i+first_page, make_temp_file ".pdf"))
in
let intdiv = pages_to_process / nthreads
and remainder = pages_to_process mod nthreads in
let nested_arr =
let rec f l ncum rmndr = function
| 0 -> Array.of_list l
| i ->
let npgs = intdiv + (if rmndr>0 then 1 else 0) in
let ncum1 = ncum + npgs in
let new_el = Array.sub tmppdf_arr ncum npgs in
f (new_el::l) ncum1 (rmndr-1) (i-1)
in
f [] 0 remainder nthreads
in
let threadarr = Array.map (Thread.create process_pagelist) nested_arr in
Array.iter Thread.join threadarr;
let pdffilenamelist = List.map snd (Array.to_list tmppdf_arr) in
let pdfliststring = String.concat " " pdffilenamelist in
pr ("OCR done. Writing \"" ^ outfile ^ "\"");
let tmpoutfile =
if List.length pdffilenamelist > 1 then
(
let tout = Filename.temp_file ~temp_dir:global_temp_dir "pdfsandwich_output" ".pdf" in
run (!pdfunite ^ " " ^ pdfliststring ^ " " ^ tout);
if (not debug) then List.iter Sys.remove pdffilenamelist;
tout
)
else List.hd pdffilenamelist
in
try
Unix.rename tmpoutfile outfile;
with _ -> run("mv \"" ^ tmpoutfile ^ "\" \"" ^ outfile ^ "\"");
;;
let main () =
let arg_filename = ref "" in
let outputfile = ref "" in
let first_page = ref 1
and last_page = ref 0 in
let resolution = ref 300 in
let maxpixels = ref 17415167 in
let lang = ref "eng" in
let rgb = ref false in
let gray = ref false in
let preprocess = ref true in
let unpaperopts = ref "" in
let layout = ref "none" in
let grayfilter = ref false in
let hocropts = ref "" in
let convertopts = ref "" in (*additional convert options*)
let tessopts = ref "" in (*additional tesseract options*)
let nthreads = ref 0 in
let debug = ref false in
let enforcehocr2pdf = ref false in
let pagesize = ref "original" in
let set_hocr_opts op () = hocropts := !hocropts ^ " " ^ op in
let set_unp_opts op () = unpaperopts := !unpaperopts ^ " " ^ op in
(* determins the number of threads tesseract may use for each page;
if this is set to more than 1 it currently clashes with tesseract 4:*)
let omp_thread_limit = ref 1 in
let get_tesseract_language_list () =
let tesseract_langs =
let in_ch = Unix.open_process_in (!tesseract ^ " --list-langs 2>&1") in
let rec read_tess l =
try
let s = input_line in_ch in
read_tess (s::l);
with End_of_file ->
(ignore (Unix.close_process_in in_ch); l)
in
read_tess [];
in
if not (List.mem "eng" tesseract_langs) then
(
prerr_endline "Warning: tesseract option --list-langs not implemented. Cannot check languages. Make sure you have all necessary tesseract language packages installed.";
[]
)
else
(
match List.rev tesseract_langs with
| [] -> []
| h::t ->
if Str.string_match (Str.regexp "List of available languages") h 0 then t
else h::t
)
in
let speclist = [
("-convert", Arg.Set_string convert, "\t -convert filename : name of convert binary (default: convert)");
("-coo", Arg.Set_string convertopts, "\t\t -coo options : additional convert options; make sure to quote;\n\t\t e.g. -coo \"-normalize -black-threshold 75%\"\n\t\t call convert --help or man convert for all convert options");
("-debug", Arg.Set debug, "\t keep all temporary files in /tmp (for debugging)");
("-enforcehocr2pdf", Arg.Set enforcehocr2pdf, "\t use hocr2pdf even if tesseract >= 3.03");
("-first_page", Arg.Set_int first_page, "\t -first_page number : number of page to start OCR from (default: 1)");
("-grayfilter", Arg.Set grayfilter, "\t enable unpaper's gray filter; further options can be set by -unpo");
("-gray", Arg.Set gray, "\t use grayscale for images (default: black and white);\n\t\t will be overridden by use of rgb");
("-gs", Arg.Set_string gs, "\t\t -gs filename : name of gs binary (default: gs); optional, only required for resizing");
("-hocr2pdf", Arg.Set_string hocr2pdf, "\t -hocr2pdf filename : name of hocr2pdf binary (default: hocr2pdf);\n\t\t ignored for tesseract >= 3.03 unless option -enforcehocr2pdf is set");
("-hoo", Arg.String (fun s -> set_hocr_opts s()), "\t\t -hoo options : additional hocr2pdf options; make sure to quote");
("-identify", Arg.Set_string identify, "\t -identify filename : name of identify binary (default: identify)");
("-last_page", Arg.Set_int last_page, "\t -last_page number : number of page up to which to process OCR (default: number of pages in inputfile)");
("-lang", Arg.Set_string lang, "\t -lang language : language of the text; option to tesseract (default: eng)\n\t\t e.g: eng, deu, deu-frak, fra, rus, swe, spa, ita, ...\n\t\t see option -list_langs;\n\t\t Multiple languages may be specified, separated by plus characters.");
("-layout", Arg.Set_string layout, "\t -layout { single | double | none } : layout of the scanned pages; requires unpaper\n\t\t single: one page per sheet\n\t\t double: two pages per sheet\n\t\t none: no auto-layout (default)");
("-list_langs", Arg.Unit (fun() -> List.iter print_endline (List.sort compare (get_tesseract_language_list ())); exit 0), "\t list currently available languages and exit;\n\t\t in case of custom binaries of tesseract, place this after the -tesseract option");
("-maxpixels", Arg.Set_int maxpixels, "\t -maxpixels NUM : maximal number of pixels allowed for input file\n\t\t if (resolution/72)^2 *width*height > maxpixels then scale page of input file down\n\t\t prior to OCR so that page size in pixels corresponds to maxpixels;\n\t\t default: 17415167 (A3 @ 300 dpi)");
("-noimage", Arg.Unit (set_hocr_opts "-n"), "\t do not place the image over the text (requires hocr2pdf; ignored without -enforcehocr2pdf option)");
("-nopreproc", Arg.Clear preprocess, "\t do not preprocess with unpaper");
("-nthreads", Arg.Set_int nthreads, "\t -nthreads number : number of parallel threads (default: guessed number of CPUs; if guessing fails: 1)");
("-o", Arg.Set_string outputfile, "\t\t -o filename : output file; default: inputfile_ocr.pdf (if extension is different\n\t\t from .pdf, original extension is kept)");
("-omp_thread_limit", Arg.Set_int omp_thread_limit, "\t -omp_thread_limit number : number of threads tesseract may use for each page (default: 1)\n\t\tvalues greater than 1 may cause tesseract >=4 to hang up");
("-pagesize", Arg.Set_string pagesize, "\t -pagesize { original | NUMxNUM } : set page size of output pdf (requires ghostscript)\n\t\t original: same as input file (default)\n\t\t NUMxNUM: width x height in pixel (e.g. for A4: -pagesize 595x842)");
("-pdfinfo", Arg.Set_string pdfinfo, "\t -pdfinfo filename : name of pdfinfo binary (default: pdfinfo)");
("-pdfunite", Arg.Set_string pdfunite, "\t -pdfunite filename : name of pdfunite binary (default: pdfunite)");
("-resolution", Arg.Set_int resolution, "\t -resolution NUM : resolution (dpi) used for OCR (default: 300)");
("-rgb", Arg.Set rgb, "\t\t use RGB color space for images (default: black and white);\n\t\t use with care: causes problems with some color spaces");
("-sloppy_text", Arg.Unit (set_hocr_opts "-s"), "\t sloppily place text, group words, do not draw single glyphs;\n\t\t ignored for tesseract >= 3.03 unless option -enforcehocr2pdf is set");
("-tesseract", Arg.Set_string tesseract, "\t -tesseract filename : name of tesseract binary (default: tesseract)");
("-tesso", Arg.Set_string tessopts, "\t -tesso options : additional tesseract options; make sure to quote");
("-unpaper", Arg.Set_string unpaper, "\t -unpaper filename : name of unpaper binary (default: unpaper)");
("-unpo", Arg.String (fun s -> set_unp_opts s()), "\t -unpo options : additional unpaper options; make sure to quote");
("-quiet", Arg.Set quiet, "\t suppress output");
("-verbose", Arg.Set verbose, "\t produce more output");
("-version", Arg.Unit (fun () -> Printf.printf "pdfsandwich version %s\n" pdfsandwich_version; exit 0), "\t print version and quit");
] in
Sys.remove global_temp_dir;
Arg.parse speclist (fun s -> arg_filename := s) "USAGE: pdfsandwich [options] inputfile.pdf\n\nOptions:";
Unix.mkdir global_temp_dir 0o700;
List.iter check_for_binary [!convert; !tesseract; !gs; !pdfunite];
if !enforcehocr2pdf then check_for_binary !hocr2pdf;
if !preprocess then check_for_binary !unpaper;
if !outputfile = "" then
(
outputfile := Str.global_replace (Str.regexp "^\\(.+\\)\\.\\(....?\\)$") "\\1_ocr.\\2" !arg_filename;
(*avoid input files to be overwritten:*)
if !outputfile = !arg_filename then outputfile := !outputfile ^ "_ocr"
);
(try Unix.access !arg_filename [Unix.R_OK] with _ -> failwith ("Could not open file " ^ !arg_filename));
pr ("pdfsandwich version " ^ pdfsandwich_version);
if !verbose then (*check versions of external programs:*)
(
let check_version progstring opt =
print_endline ("Checking for " ^ progstring ^ ":");
run ~crash:false (progstring ^ " " ^ opt);
in
check_version !convert "-version";
if !preprocess then check_version !unpaper "-V";
check_version !tesseract "-v";
if !enforcehocr2pdf then check_version !hocr2pdf "-h";
check_version !gs "-v";
check_version !pdfinfo "-v";
check_version !pdfunite "-v";
);
if not !grayfilter then set_unp_opts "--no-grayfilter" ();
set_unp_opts ("--layout " ^ !layout) ();
let page_width_height =
try
match Str.split (Str.regexp_string "x") !pagesize with
| width::height::[] -> Some (int_of_string width, int_of_string height)
| _ -> None
with _ -> failwith ("invalid pagesize value " ^ !pagesize)
in
(*check if requested language is supported by tesseract:*)
let langlist = Str.split (Str.regexp_string "+") !lang in
let tesseract_langs = get_tesseract_language_list () in
if List.length tesseract_langs > 0 then
List.iter
(fun s ->
if not (List.mem s tesseract_langs) then
failwith ("Language " ^ s ^ " not supported by tesseract. Make sure that the respective tesseract language package is installed.\n"))
langlist;
pr ("Input file: \"" ^ !arg_filename ^ "\"");
pr ("Output file: \"" ^ !outputfile ^ "\"");
(*use different filename for the input file in case the original input file contains special characters:*)
let internal_input_filename = Filename.temp_file ~temp_dir:global_temp_dir "pdfsandwich_inputfile" ".pdf" in
Sys.remove internal_input_filename;
(*link original input file to internal_input_filename:*)
let full_path_input_file = if Filename.is_relative !arg_filename then ((Sys.getcwd ()) ^ "/" ^ !arg_filename) else !arg_filename in
Unix.symlink full_path_input_file internal_input_filename;
let npages = number_of_pages internal_input_filename in
pr ("Number of pages in inputfile: " ^ (string_of_int npages));
if (!first_page < 1 || !first_page > npages) then failwith ("Value " ^ (string_of_int !first_page) ^ " is invalid as first_page.");
if !last_page < 1 then last_page:= npages;
if (!last_page < !first_page || !last_page > npages) then failwith ("Value " ^ (string_of_int !last_page) ^ " is invalid as last_page.");
if !nthreads < 1 then (*guess number of CPUs*)
nthreads := number_of_cpus ();
let npages_to_process = !last_page - !first_page + 1 in
if !nthreads > npages_to_process then
(
pr ("More threads than pages. Using " ^ (string_of_int npages_to_process) ^ " threads instead.");
nthreads := npages_to_process;
);
(*precede tesseract call with a thread limit to prevent hang ups for tesseract >=4:*)
tesseract := ("OMP_THREAD_LIMIT=" ^ (string_of_int !omp_thread_limit) ^ " " ^ !tesseract);
process_ocr
internal_input_filename
!outputfile
!first_page !last_page
!resolution
!rgb
!gray
!nthreads
!lang
!convertopts !tessopts !hocropts
!preprocess !unpaperopts
!debug
!enforcehocr2pdf
page_width_height
!maxpixels;
Unix.unlink internal_input_filename;
pr ("\n" ^ !outputfile ^ " generated.\n\nDone.");
if (not !debug) then Unix.rmdir global_temp_dir;
;;
main ();;
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