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Teaching Computers To Read Part 3

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Submitted on: 5/4/2001 5:00:44 AM
By: BigCalm  
Level: Advanced
User Rating: By 29 Users
Compatibility:VB 5.0, VB 6.0

Users have accessed this code 13569 times.
 

(About the author)
 
     An Optical Character Recognition (OCR) program. The goal of this ongoing experimental project is to build a neural net capable of recognising zipcodes or text within bitmaps. Part 3 includes a much faster net (array based, rather than Class/Collection based), simulated annealing, and Nguyen-Widrow initialisation. Other keywords: AI, Artificial Intelligence, Perceptron, Feed-Forward, BackPropogation

 
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Other User Comments
5/4/2001 6:25:13 AM:Victor Stefanescu
You should contact MIT for a lifetime 
contract. Congratulations!
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5/4/2001 7:44:56 PM:Eric G
simply amazing! Great work. Excellent 
from me.
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5/5/2001 7:09:12 AM:Bcwan
it's a great work man, Good luck with 
my vote, very good.
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5/21/2001 10:02:00 PM:#uberGeek
One question..... why isnt this the 
NUMBER 1 peice of code on PSC????? 
Great work man.
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5/24/2001 12:50:08 PM:Sean Street, MCP
Excellent app.  Too bad I got caught 
messing with it at work.  I was 
wondering, how difficult would it be to 
indicate whether the computer correctly 
identified the glyph?  And based on 
that, adjust accordingly.  For example, 
it did have some difficulty identifying 
the number 8.  I picked 8 because it's 
obviously the most difficult to 
identify.  Great app just the same 
though.
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5/25/2001 4:22:15 PM:Andreas Laubscher
An impressive piece of code. I'm quite 
looking forward to seeing how it... 
develops.
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5/29/2001 5:20:17 AM:BigCalm
Ack Sean, the project is still very 
experimental, but it's slowly getting 
there I think - in this submitted 
version it should be 98% accurate on 
typewriter fonts, but pretty poor on 
other types such as script and 
hand-drawn glyphs - I'd estimate at 
about 60-70%.  This will improve with 
more fonts, more neurons in the hidden 
layers, and more training.
There's a 
reasonably high possibility that I'll 
shift languages for Part 4 (Java).  
Watch this space.
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6/22/2001 8:24:00 AM:Mark Robert Strange
Big Calm, this project is outstanding. 
My final exam in a C++ course was to 
design a very similar program, and I 
know that this was not easy. 5 Globes 
all the way, you'd get more if I could 
give them! =)
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6/23/2001 7:38:38 AM:BigCalm
You must open the NNGroup GROUP rather 
than the individual projects for this 
to compile ok ;0p
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6/23/2001 2:44:28 PM:Shawn
Terminator 3 in the making...
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6/25/2001 3:39:20 PM:Benjy
this is really cool! thought about 
using the whole alphabet and symbols?
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6/28/2001 8:45:47 PM:charles
wont compile i started with the group 
to it says invalid type
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11/2/2001 8:06:50 AM:Alpha
Wonderful! Fantastic!
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6/12/2002 10:26:15 PM:Chris
i have made a program that can read 
somewhat well check it out 
at:
http://www.planet-source-code.com
/vb/scripts/ShowCode.asp?txtCodeId=35774
&lngWId=1
that program uses the 
image and looks at pixels.  I just 
created a program that looks at the 
mouse movements instead.  Its a lot 
faster but the problem is its not as 
accurate.
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6/13/2002 12:50:12 PM:Chris
here is the new program its many times 
faster!
http://www.planet-source-code
.com/vb/scripts/ShowCode.asp?txtCodeId=3
5799&lngWId;=1
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7/18/2002 1:07:45 PM:gnatz
Great work BigCalm! Thanks for 
sharing.
There is a small bug in the 
tracking of the dendrite count in the 
CalculateOutput and AdjustWeights 
Subs.
     For k = 
Layers(i).StartDendrite + ((j - 
Layers(i).StartNeuron) * _
Layers(i - 1).NeuronCount) To 
Layers(i).StartDendrite + _
((j - Layers(i).StartNeuron) * Layers(i 
- 1).NeuronCount) + _
        Layers(i 
- 1).NeuronCount - 1
        'Bug 
found! The original code missed the 
last -1, causing extra input in
 'neuron value computation.
       Neurons(j).Value = 
Neurons(j).Value + 
(Neurons(PrevNLayerPtr).Value * 
Dendrites(k).TransferWeight)
PrevNLayerPtr = PrevNLayerPtr + 1
 Next k
Anothe comment: adding a 
momentum term in the weight update 
improves the learning quite a bit, at 
least for the XOR text problem.
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8/27/2002 2:09:49 AM:dark syphon
didnt work, nothing much to it, try 
coding a calculator or something more 
on your level.
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9/4/2002 3:53:07 PM:gridrun
this is, one of the most elite (yes, 
ELITE =P) pieces of code around on 
pscode.com. BiiiiiiiiiiiiiiiiiiG thanks 
to BigCalm for sharing this, I do 
apperciate this very very very much!!
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9/21/2002 7:59:02 AM:
great stuffman .
I am working on 
signature verification system and i 'll 
be using your code .
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