Character Recognition Example (III):Training a Simple NN for classification

This demo shows some examples for image pre-processing before the recognition stage.

Description

This demo shows the recognition stage for the character recognition. This example come with a GUI with a trained network for handwritting recognition. The step-by-step explanation can be found at:

http://basic-eng.blogspot.com/

Acknowledgements

The author wishes to acknowledge the following in the creation of this submission:
Character Recognition Example (I&II): Pre-processing of Image
This submission has inspired the following:
Character Recognition Example (IV):Training a Simple NN for classification, Character Recognition Example (V):Training a Simple NN for classification, MATLAB GUI Makeover

• Required Products: Image Processing Toolbox; Neural Network Toolbox
• MATLAB release: MATLAB 7.5 (R2007b)

[kailup Tan]

It works in MATLAB 7 but some of the readers facing the same problem with you: try to change line 26 --> Ic(:,4) = 1:50; to Ic(:,4) = [1:50]'; in edu_imgpreprocess.m (think ML 7 smart enough to change 1:50 to a column vector but ML 6 still not able to perform it automatically)

[Chibila Ulaya]

Great help in my research. Built a marking machine using a webcam instead of a scanner for image acquisition.....works fantastically due to the guidance in this code...

[Salim Alkathiri]

this is the example that will make me understand the concept of handwirtten character recognition. Using nuralnetwor as methode for recognition training. I thank you all for your efforts.

[Satyajit Malugu]

is the GUI executable on all machines or it needs any modifications?

[ari kabisat]

great. help my research to detect pipe. thanks very much..muah

[Miguel de Juana]

Hello, i have a problem, i want to know, which parameters take the program from the image to recognition of the number, is urgent, thanks.

[anand dwivedi]

 

[naresh v]

i really acknowledge this effort
keep it up

[desture restret]

 

[anirudh r]

 

[Amninder Kaur]

 

[jineen mohammed]

thanx alot, i have gained alot of useful things from this code
but a want to ask how can we aligment the image in order to know the (x,y)=(0,0)of it
thaaanx again

[Vikas Rajput]

Dear Sir I have following problem when running charGUI in my matlab6.5
Unable to read MAT file C:\numeral recognition\charGUI.fig
plz help me what can i do
vikas

[vaishali shinde]

it is realy excellent & very usefull to all

[nafisa gady]

 

[ihsan ihsan]

Thanks for sharing. Have you any code about hyperspectral image analysis?
Regards

[nalan soylu]

Please type the characters you see in the picture above

[vaishali shinde]

 

[Nors Harman]

Very good example!

[fa ho]

ok

[anju akalanka]

 

[salman syed]

i ran chargui.m, loaded image, did select, pre process, feature extract & recognize, nothing happen in feature extract and recognize,
and this was written,
"
??? Reference to non-existent field 'charvec'.

Error in ==> charGUI>pbRecognize_Callback at 142
charvec = handles.charvec;

Error in ==> gui_mainfcn at 75
        feval(varargin{:});

Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback."

what should i do, i dont know much about matlab.

[aradya tp]

 Hope information given here will help much to know the concept of CR,,,,, thanks......

[z h]

i ran chargui.m, loaded image, did select, pre_process, nothing happen in feature extract and recognize, and this was written,
 
??? There is no 'Colormap' property in the 'uipanel' class.
Error in ==> imshow at 115
    set(figHandle, 'Colormap', map);
Error in ==> charGUI>pbPreprocess_Callback at 117
imshow(bw);
Error in ==> gui_mainfcn at 75
        feval(varargin{:});
Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});
??? Error while evaluating uicontrol Callback.
 
when i did feature extract & recognize,the wrong is following:
 
??? Reference to non-existent field 'bw2'.
Error in ==> charGUI>pbExtract_Callback at 130
bw2 = handles.bw2;
Error in ==> gui_mainfcn at 75
        feval(varargin{:});
Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});
??? Error while evaluating uicontrol Callback.
 
 
 what should i do

[z h]

my email is [e-mail]

[kobe]

how can I access the training data so I can change it for my own data?
[e-mail] if you know, cheers

[Kaso]

i'd like to know where can i get the image processing toolbox which required for this program.my email address :[e-mail]
3ks a lot

[art]

I have the same question as kobe above. How can i change the training data?

[erruva erruva]

Greate work! Works fine for 1-9. But why is 0 recognized as 10? I can not understand the training data.

[Eugene]

Hi
When I ran chargui, I could load the image and select region. But nothing happens when I press crop. Also when I press preprocess the following error occur
??? There is no 'Colormap' property in the 'uipanel' class.

Error in ==> <a href="error:C:\MATLAB7\toolbox\images\images\imshow.m,115,1">imshow at 115</a>
    set(figHandle, 'Colormap', map);

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,117,1">charGUI>pbPreprocess_Callback at 117</a>
imshow(bw);

Error in ==> <a href="error:C:\MATLAB7\toolbox\matlab\uitools\gui_mainfcn.m,75,1">gui_mainfcn at 75</a>
        feval(varargin{:});

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,42,1">charGUI at 42</a>
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

When I did feature extraction the following error occur
??? Reference to non-existent field 'bw2'.

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,130,1">charGUI>pbExtract_Callback at 130</a>
bw2 = handles.bw2;

Error in ==> <a href="error:C:\MATLAB7\toolbox\matlab\uitools\gui_mainfcn.m,75,1">gui_mainfcn at 75</a>
        feval(varargin{:});

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,42,1">charGUI at 42</a>
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

When I press recognize the following error occur
??? Reference to non-existent field 'charvec'.

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,142,1">charGUI>pbRecognize_Callback at 142</a>
charvec = handles.charvec;

Error in ==> <a href="error:C:\MATLAB7\toolbox\matlab\uitools\gui_mainfcn.m,75,1">gui_mainfcn at 75</a>
        feval(varargin{:});

Error in ==> <a href="error:C:\MATLAB7\work\charGUI.m,42,1">charGUI at 42</a>
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

What should I do??

my email is [e-mail]

[salam fadi]

please i don't know how i get these files and dowload it please tell me my email is [e-mail]

[humza]

i ran chargui.m, loaded image, did select, pre process, feature extract & recognize, nothing happen in feature extract and recognize,
and this was written,
"
??? Reference to non-existent field 'charvec'.
 
Error in ==> charGUI>pbRecognize_Callback at 142
charvec = handles.charvec;
 
Error in ==> gui_mainfcn at 75
        feval(varargin{:});
 
Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});
 
??? Error while evaluating uicontrol Callback."
 
what should i do,

[Thabit]

Hi, I think this the best guide to OCR I have seen so far, but I wonder if you would be able to give me a simple explanation on what to change if I needed to expand this to include A-Z?

[e-mail]

Thanks

[Examples Learn By]

Thanks a lot
http://learnbyexamples.org/category/matlab

[Haider Raza]

How to run CHARGUI....its a figure file..!!

[ALOK JHA]

was of great help for my project...
pls tell me how do i include alphabets and special character in recognition.
[e-mail]

[Yawar Rehman]

gr8

[stephanie borg]

 

[prathiba]

great

[Waqas Soomro]

hi. when i m loading image in chargui its ginen following errors. plz guide me in this problem.

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback

[Mr Smart]

 

[Mert]

 

[shubhi]

Error in ==> gui_mainfcn at 75
        feval(varargin{:});

Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

??? Error using ==> fopen
Invalid filename.

Error in ==> imread at 226
    fid = fopen(filename, 'r');

Error in ==> charGUI>pbLoad_Callback at 83
S = imread([pathname,filename]);

Error in ==> gui_mainfcn at 75
        feval(varargin{:});

Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

??? Attempt to reference field of non-structure array.

Error in ==> charGUI>pbSelect_Callback at 96
S = handles.S;

Error in ==> gui_mainfcn at 75
        feval(varargin{:});

Error in ==> charGUI at 42
    gui_mainfcn(gui_State, varargin{:});

??? Error while evaluating uicontrol Callback.

??? Input argument "bw2" is undefined.

Error in ==> edu_imgresize at 5
bw_7050=imresize(bw2,[70,50]);

??? Error using ==> fopen
Invalid filename.

Error in ==> imread at 226
    fid = fopen(filename, 'r');