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| function qr = encode_qr(message, varargin)
% ENCODE_QR create a 2D QR code containing a message
%
% This function creates a QR code containing a string message. The QR code
% can be of varying sizes.
%
% Note that this function requires zxing (<a href="http://code.google.com/p/zxing/" target="_blank">http://code.google.com/p/zxing/</a>)
% installed, and core/core.jar, javase/javase.jar on the classpath
%
% This is the second attempt, based on the code of Lior Shapira, with the
% update to ZXing v. 2.1 codebase and 'parsepropval' for cleaner list of
% the parameters
% Parameters:
%
% message - string containing message
% 'Size' - size of the QR code, in pixels. As QR is quadratic, you
% can supply either scalar or vector. Of you supply vector,
% the size must be equal. If the parameter is not supplied.
% it is determined from 'Version'.
% 'Version', 'v[1..40]' - version of the QR code
% 'Quality', 'L|M|H|Q' - quality of the error correction (Low,
% Medium, High, super (not suree ;)
% 'M' quality is the default
% 'Character_set' - charecter set for encoding QR code. 'UTF-8' is
% set to default, other values to be retrieved from
% <a href="https://github.com/zxing/zxing/blob/master/core/src/com/google/zxing/common/CharacterSetECI.java" target="_blank">https://github.com/zxing/zxing/blob/...terSetECI.java</a>
% Using 'Character_set' any other than 'ISO-8859-1' will probably
% make QR unreadable to any other QR decoder, except ZXing's
%
% Returns:
%
% qr - logical matrix of size s containing the QR code
%
% Example:
% encode_qr(message, 'Character_set', 'ISO-8859-1')
% encode_qr(message, 'Size', 25)
% encode_qr(message, 'Size', [33 33])
% encode_qr(message, 'Version', 3, 'Quality', 'h', 'Character_set', 'UTF-16BE')
%
%% AUTHOR : Lior Shapira
%% $DATE : 02-Nov-2010 11:20:45 $
%% $Revision : 1.00 $
%% DEVELOPED : 7.11.0.584 (R2010b)
%% FILENAME : encode_qr.m
import com.google.zxing.qrcode.QRCodeWriter;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
%% parse arguments
% using parsepropval from <a href="http://www.mathworks.com/matlabcentral/fileexchange/22671-parse-propertyvalue-pairs-and-structures/content/parsepropval.m" target="_blank">http://www.mathworks.com/matlabcentr...parsepropval.m</a>
props.size = [ 1 1 ]; % WRONG SIZE. Intentional
props.version = 'v1';
props.quality = 'M';
props.character_set = 'UTF-8';
props = parsepropval(props,varargin{:});
qr_init = 17; % minimal size of the QR code
qr_delta = 4; % size of the quiet zone
qr_quality = ['L' 'M' 'Q' 'H']; % error correction quality
% check supplied version
if (isa(props.version,'char') || isa(props.version,'numeric'))
if isa(props.version,'char')
qr_ver = str2num(props.version(2:end));
if not(strcmpi(props.version(1),'v'))
error('Try removing quotes at "version" parameter value')
end
else
qr_ver = props.version;
end
else
error('"version" must be string "v[1..40]" or numerical value [1..40]')
end
if ((qr_ver < 1) || (qr_ver > 40))
error('"version" must be in [1..40] range')
end
if (props.size(1) == 1) % matrix size was supplied, don't recalculate
props.size = qr_init+qr_delta*qr_ver;
end
% check quality
if isempty(strfind(qr_quality, upper(props.quality)))
error('"quality" must be string "L | M | Q | H"')
else
switch upper(props.quality)
case 'M'
qr_quality = ErrorCorrectionLevel.M;
case 'L'
qr_quality = ErrorCorrectionLevel.L;
case 'H'
qr_quality = ErrorCorrectionLevel.H;
case 'Q'
qr_quality = ErrorCorrectionLevel.Q;
end
end
% check supplied size
if isscalar(props.size)
props.size = [props.size props.size];
end
% re-check size
if (props.size(1) == props.size(2)) % must be equal
tmp = props.size(1) - 17;
if not(mod(tmp,4) == 0)
error('Matrix does not meet sizing requirements (17+N*4)')
end
else
error('Matrix must be square')
end
%% encoding qr
qr_writer = QRCodeWriter;
qr_hints = java.util.Hashtable;
% use hint for encoding type
qr_hints.put(EncodeHintType.ERROR_CORRECTION, qr_quality);
% use hint for character set
qr_hints.put(EncodeHintType.CHARACTER_SET, props.character_set);
M_java = qr_writer.encode(message, BarcodeFormat.QR_CODE, props.size(2), props.size(1), qr_hints);
qr = zeros(M_java.getHeight(), M_java.getWidth());
for i=1:M_java.getHeight()
for j=1:M_java.getWidth()
qr(i,j) = M_java.get(j-1,i-1);
end
end
clear qr_writer;
clear M_java;
qr = 1-logical(qr);
% Created with NEWFCN.m by Frank Gonzlez-Morphy
% Contact...: <a href="mailto:frank.gonzalez-morphy@mathworks.de">frank.gonzalez-morphy@mathworks.de</a>
% ===== EOF ====== [encode_qr.m] ====== |
