how to solve Error Output argument "variable_name" (and maybe others) not assigned during call to "function_name".

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Good evening to all my brothers and sisters. my codes give some issue that confuse me.
these the codes are:
Img = imread('Adok_Karo1_biner.jpg');
BW = im2bw(Img, graythresh(Img));
BW = bwareaopen(BW, 5);
re = BW;
while 1
%Fcn 'lines' separate lines in text
[fl, re]=lines(re);
%% Fcn projProfile_Horizontal separate characters in line
[char_out, num_char, L, Ne] = projProfile_Horizontal(imgn);
%% end
set(handles.text11, 'String',Ne);
%% Objects extraction
NumberOfCharacter = length(num_char); % number of characters in a line That had been stored in cell Num
for m = 1 : Ne % Ne is Number of labelled object
if Ne == 2
L1 = ismember(L, 1); % storing the labelled object 1 to L1
L2 = ismember(L, 2); % storing the labelled object 2 to L2
char_out = L1; % first object on a cropped character window
char_out2 = L2; % second object on a cropped character window
%showing first object
subplot(1, 2, 1);
caption = sprintf('character #%d', 1);
title(caption, 'FontSize', 20);
%Showing second object
caption2 = sprintf('character #%d', 2);
title(caption2, 'FontSize', 20);
%% End
BW2 = bwmorph(char_out,'thin',Inf);
z=imresize(BW2,[50 50]);
%z = imresize(BW2, [42 24]); % [m, n] format
z = feature_extract(z); % Image Zoning 3x3
FeatureOutTest = z; % new modified
save('FeatureOutTest.mat','FeatureOutTest'); % new modified
% end
if isempty(re) %See variable 're' in Fcn 'lines'!
%To stop "while" iteration when there aren't any remaining-
%character and off course the line itself in "re" image
and function for projProfile_Horizontal. m is :
function [char_out, num_char, L, Ne] = projProfile_Horizontal(areaOpeningImage)
%% projProfile_Horizontal is used to separate text line image into characters based on its horizontal projection
% char_out : a character output.
% num_char : number character in text line image.
% L : labelled characters in a cropped image window, so that we know how many image
% in a cropped image window.
% Ne : number of labelled object in a cropped image window
%clc; % Clear the command window.
%close all; % Close all figures (except those of imtool.)
% clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
%areaOpeningImage =imread('D:\pcd\tester\Segmentation\data_test\ImageAnalyst\Adok_karo1_biner.jpg');
% Show image
h1 = subplot(4, 12, 1:12);
%% Convert to gray scale
if size(areaOpeningImage, 3) == 3 % RGB image
threshold = graythresh(areaOpeningImage);
binaryImage = im2bw(areaOpeningImage, threshold);
axis('image', 'on'); % Display tick marks.
title('Binary Image', 'FontSize', fontSize);
%% Find horizontal profile
binaryImage = areaOpeningImage; % Area Opening Image is assumed euqal to binaryImage :D (just a name)
h2 = subplot(4, 12, 13:24);
horizontalProfile = sum(binaryImage, 1);
plot(horizontalProfile, 'b-');
title('Horizontal Profile', 'FontSize', fontSize);
grid on;
%% Find dividing lines between the characters.
props = regionprops(horizontalProfile == 0, 'Centroid'); %centroid of all gaps
xyCentroids = [props.Centroid];
dividingLines = xyCentroids(1:2:end); % get only the gaps centroid
for k = 1 : length(dividingLines)
thisX = dividingLines(k);
%line(h1, [thisX, thisX], ylim(h1), 'Color', 'r');
line([thisX, thisX], ylim(h1), 'Parent', h1, 'Color', 'r');
%line(h2, [thisX, thisX], ylim(h2), 'Color', 'r');
line([thisX, thisX], ylim(h2), 'Parent', h2, 'Color', 'r');
%% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'Outerposition', [0, 0.05, 1, 0.95]);
%% Extract each letter.
fontSize = 12;
num_char = {};
char_coord = 1;
for k = 1 : length(dividingLines) - 1
thisX = round(dividingLines(k));
nextX = round(dividingLines(k+1));
subplot(4, 12, 24 + k);
thisLetter = binaryImage(:, thisX:nextX);
[L, Ne] = bwlabel(thisLetter);
char_unpads = pads_crop(thisLetter);
char_pads = padarray(char_unpads,[2 2], 'both');
caption = sprintf('Letter #%d', k);
title(caption, 'FontSize', fontSize);
char_out = char_pads;
num_char{1, char_coord} = {num_char, char_out}; % storing all characters into cell
char_coord = char_coord + 1; % plus the coordinat by 1
break; % new editted, so that only take a word per line
function img_out = pads_crop(thisCharacter)
% cropping the pads
[f, c]=find(thisCharacter); % finding row(f) and column(c) indices
img_out=thisCharacter(min(f):max(f),min(c):max(c));%Cropping all pad of image
% end
The Error is :
Output argument "char_out" (and maybe others) not assigned during call to "projProfile_Horizontal".
Error in DetectAksara>btnRecognize_Callback (line 352)
[char_out, num_char, L, Ne] = projProfile_Horizontal(imgn);
Error in gui_mainfcn (line 95)
Error in DetectAksara (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in>@(hObject,eventdata)DetectAksara('btnRecognize_Callback',hObject,eventdata,guidata(hObject))
352 [char_out, num_char, L, Ne] = projProfile_Horizontal(imgn);
i had looked at the projProfile_Horizontal function and ran it separately, but it worked properly.
what should i do to solve this error ?

Answers (1)

Jan on 14 Jan 2019
If length(dividingLines) - 1 equals 0, the loop is not entered and char_out is not created.
Use the debugger to find out, what's going on: Set a breakpoint in the first line of the failing function and step through the code line by line. Then you will see directly, why the output is not defined.

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