AUTO-MULTIPLE-CHOI(1)

NAME
auto-multiple-choice-analyse - automatic data capture from scans for AMC multiple choice exams.

SYNOPSIS

auto-multiple-choice analyse --projet project-dir [--seuil-coche threshold] [--tol-marque tol] [--list-fichiers files-list.txt | scan-files...]

DESCRIPTION

The auto-multiple-choice analyse command performs automatic data capture from scans of completed answer sheets of an AMC multiple choice questionnaire. Before calling auto-multiple-choice analyse, auto-multiple-choice-prepare(1) should have been called to make working documents (--mode s) and the layout should have been processed with auto-multiple-choice-meptex(1).

--data data-dir
    gives the directory where data files are (see for example auto-multiple-choice-meptex(1)). Defaults to project-dir/data.

--cr project-cr-dir
    gives a directory where to create image reports of the data capture (zooms on the boxes in a zooms sub-directory, name filed extraction as a name-*.jpg file, and layout report as a page-*.jpg file).

--projet project-dir
    When using this option, if --cr is not used, project-cr-dir will be set to project-dir/cr.

Giving the names of the scan files to process can be done in two ways:

    • these names can be given as arguments,

    • these names can be written to a plain file (one filename per line), using the --list-fichiers files-list.txt to give the name of this file.

Some parameters for data capture may be set using the following options:

--prop proportion
    sets the proportion of each box that will be measured to decide if the box is ticked or not. Default value is 0.8.

--bw-threshold threshold
    This parameter is used when converting the grayscale scan file to black and white. To get more black pixels, use a greater value. To get more white pixels, use a smaller value. The threshold must be between 0 and 1. The default value is 0.6.

--ignore-red
    With this option, only red channel will be used from color scans. This way, all that is written in red will be ignored in the scan. This can be useful when the boxes are printed in red.

--tol-marque tol
    defines the tolerance when detecting the four marks in the scans corners. These marks are detected looking for black connected components which dimensions are closed to the target dimension target (exact dimensions of the marks if printing/scanning process where perfectly accurate). If tol is a real number, accepted dimensions are those between (1-tol)*target and (1+tol)*target. If tol is "tinf,tsup" (where tinf and tsup are real numbers), accepted dimensions are those between (1-tinf)*target and (1+tsup)*target. A standard value is 0.2.

--multiple
    This option is to be used when the scans are photocopies from some subjects (different students can have the same subject). In this case, copy numbers are allocated to students so that their answer sheets, with the same subject number, can be differentiated.

--pre-allocate copy_id
    This option can be used in conjunction with --multiple. The copy numbers used for the scans will start from copy_id, in the same order than the scans given as arguments.

--try-three | --no-try-three
    Use one of these options to tell if you allow processing of scans where only three corner marks are present.

--debug file.log
    gives a file to fill with debugging information.

AUTHORS

Alexis Bienvenüe <paamc@passoire.fr>
    Main author

Anirvan Sarkar
    Author and Editor

Hiroto Kagotani
    Editor

Frédéric Bréal
    Author and Editor

Jean Bérard
    Translation from French

Georges Khaznadar
    Translation from French

COPYRIGHT
Copyright © 2008-2025 Alexis Bienvenüe

This document can be used according to the terms of the GNU General Public License, version 2 or later.