univ-pau-ics/build/service/Tesseract.php

<?php

	namespace service;

	class Tesseract{

		/* [1] Attributes
		=========================================================*/
		private $fname    = null;


		/* (1) Constructs and initialise a readed file
		*
		* @fname<String>						Path of the image
		*
		* @return instance<Tesseract>			New Tesseract
		*
		---------------------------------------------------------*/
		public function __construct($fname=null){

			/* [1] Check argument
			=========================================================*/ {

				/* (1) Check type */
				if( !is_string($fname) )
					throw new \Exception("Tesseract.__construct(<String>) expected but Tesseract.__construct(<".gettype($fname).">) received");

				/* (2) Check file validity */
				if( !file_exists($fname) )
					throw new \Exception("Tesseract.__construct(<PATH>) but <PATH> is not valid");

			}


			/* [2] Store as attribute
			=========================================================*/
		    $this->fname = $fname;

		}



		/* (2) Read the image file
		*
		* @return read<String>					The read content
		*
		---------------------------------------------------------*/
		public function read(){

			/* [1] Record the text from the image
			=========================================================*/
			/* (1) Process tesseract */
			$read = shell_exec("tesseract ".$this->fname." stdout -l fra --user-words ".__ROOT__."/config/edt.user-words -c language_model_penalty_non_freq_dict_word=0.1 -c language_model_penalty_non_dict_word=.15 -c tessedit_char_whitelist=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 2>/dev/null");

			/* (2) If empty */
			if( is_null($read) )
				throw new \Exception("Nothing read");

			/* (3) Split by lines */
			$by_line = explode("\n", $read);

			/* (4) Get first line (title) */
			$title = $by_line[0];

			/* (5) Get last non-empty line */
			for( $i = count($by_line)-1 ; $i > 0 ; $i-- ){

				// {1} Check not empty //
				if( empty($by_line[$i]) )
					continue;

				// {2} Matches //
				if( preg_match('@^amphi@i', $by_line[$i]) || // 'amphi A', 'amphi 600 droit'
					preg_match('@^S\d+@i', $by_line[$i])     // 'S10', 'S22'
				)
					return [ $title, $by_line[$i] ];

			}


			return [ $title, 'unknown' ];

		}


	}