How is barcode recognition done?

Hi
Sorry if I have posted this in the wrong forum, as I am a little unsure where this really belongs.
I am currently working on a software decoder that will be able to take images similar to barcodes and decode them. I already have the encoder working and I am able to create the encrypted image, but am strugling to create a reliable decoder that can analyse an the image and decode it.
The decoder I have at present works fine if the image being decoded is EXACTLY the same image produced from the encoder (i.e. image has not been altered e.g. stretched or resized), since my decoder knows where to find pixels, but if one pixel is off by so much as one pixel location then the program will fail to decode. As you can gess this method is far from elegant, so I am really wanting to know if anyone has any ideas or experience on algorithms or anything I should be looking at to improve my decoder. I have searched the net and found a couple of programs that does image recognition, and can pick out barcode etc and decode them. The third link below is particularly good, as it shows the program is capable of decoding a photo of a barcode - it is able to pick out the barcode and then decode it.
Here are screenshots from 2 applications.
http://www.pdf417kit.com/screenshot.jpg
http://www.intelcom.ru/img/example/prngrow2.bmp
http://www.snapfish.co.uk/slideshow/AlbumID=19811658/PictureID=430558628/t_=20428522
Here is an image of some encoded data generated by my encoder:
http://www.snapfish.co.uk/slideshow/AlbumID=19811658/PictureID=430558627/t_=20428522
Anyone have any tips as to how I can make my decoder more flexible?
I dont know much about the Java advanced imaging stuff, so some good online tutorials as to what I should need to know to do what I want to do would be good.
again sorry if I am not very clear with my problem, I will try to answer any questions you may have.
thanks

What's a bar code? It's a rectangular striped area. So you can defocus your picture, locate a small rectangular, gray area, and you have located the bar code.
You can try finding the small rectangle, correct scale and orientation, make its contrast better (to have a image in white and black) and draw some lines in the bar code (like a laser scanner) trying to find a pattern with stripes.
When you find a rectangular striped area, you can try interpreting the stripes using all algorithms that your program is able to handle. When you read something that makes sense (for instance, several of the bar codes have error detection and correction codes), you have the correct bar code.

Similar Messages

I would like to know it it's possible to change the scroll bar from the right part of the firefox browser, to the left part and, if it's possible, how can it be done. Thank you!

The scroll bar (the one used to scroll up and down any kind of website), that is normally in the right part of the firefox browser, would be of much help to me if it could sometimes be moved to the left part of the browser. Is this possible? How can it be done? Can anybody tell me the exact steps to take in order to do this (if it is possible of course)? This would be helpfull to me, since I think that the firefox scroll bar is overlaping the scroll part of the facebook chat sidebar, since I just can see a few people on this facebook chat sidebar and I can´t scroll along it, as I could a while ago. So my guess is that the firefox scroll bar is covering the other. In order to solve it in a simpler way, I guessed that if the firefox scroll bar could be moved to the left side of the browser, this problem could be solved. So, can anybody help me?

http://kb.mozillazine.org/layout.scrollbar.side
Type '''about:config''' in Location (address) bar
filter for '''layout.scrollbar.side'''
Right-click the Preference and Modify it to '''3'''
You may need to reload any pages open to have scrollbar move to left after Preference change.

HT4098 How do I unsubscribe from subscription VIP in the game StarMaker? every week, I removed 66 rubles, while I'm there not even sit, and how do I unsubscribe don't know, please help

How do I unsubscribe from subscription VIP in the game StarMaker? every week, I removed 66 rubles, while I'm there not even sit, and how do I unsubscribe don't know, please help

Contact the maker of the app. Apple has nothing to do with subscriptions to third party apps.

Can anyone help me change the DOB on my sons profile for his apple I'd so I can setup family sharing? I originally put both ids in my name. He is 19 do it keeps saying needs my permission but no instructions in how to get that done?

Can anyone help me change the DOB on my sons profile for his apple I'd so I can setup family sharing? I originally put both ids in my name. He is 19 do it keeps saying needs my permission but no instructions in how to get that done? His phone was stollen once last month need to get this done ASAP to prevent future headaches. Ty

You can not change the date of birth on the account. Apple makes that clear up front when the account is created.
The only way to "fix" this is going to be for him to create a new account with the correct information. Any apps purchased with the old one will need to be re-purchased with the new account. They can not be transferred.

I would like to transfer the balance from one Apple ID to another how can this be done??

I want to transfer the account ballance from my account to my son's. I unintentionally redeemed one of his gift cards to my account. how can this be done?

Sorry, but balances can't be transferred from one iTunes Store account to another. You'll either have to make his purchases through your account, or buy another prepaid card and redeem that in his account.
BTW, for future questions, this forum is for questions from those managing sites on iTunes U, Apple's service for colleges and universities to post educational material in the iTunes Store. You'll be most likely to get help if you ask in the general iTunes forums.
Regards.

I want to shoot a movie on my iPhone and edit it on my iPad using the iMovie app. How can this be done via iTunes on my computer?

I want to shoot a movie on my iPhone and edit it on my iPad using the iMovie app. How can this be done via iTunes on my computer?

You can't drag video into the filesharing pane of iTunes, you can only transfer projects.
Videos need to come in via the photos tab of iTunes.
The easiest way to get videos from the iPhone to the iPad is via the project export import.
Projects can be exported from the iPhone, then imported to the iPad like this:
iPhone Send a project or trailer to iTunes
If the marquee screen isn’t showing, tap the My Projects button .
Scroll to center the project or trailer you want to share.
Tap the Share button at the bottom of the screen, and then tap iTunes; tap OK when iMovie indicates that export is complete.
Connect your device to your computer, and then open iTunes on your computer.After a moment, your device appears in iTunes, below Devices on the left.
Select the device, and then click Apps at the top of the iTunes window.
Select iMovie in the Apps list below File Sharing. (You may need to scroll to see it.)
In the iMovie Documents pane, select the file you just shared, and then click the “Save to” button; save the file to your computer in a place where you can find it easily.You can also save the file by dragging it to the desired location on your computer.
Disconnect the device from your computer.
iPad Import a project or trailer from iTunes
Connect your device to your computer, and open iTunes on your computer.After a moment, your device appears in iTunes, below Devices on the left.
Select the device, and click Apps at the top of the iTunes window.
Select iMovie in the Apps list below File Sharing. (You may need to scroll to see it.)
Click Add below the iMovie Documents pane; in the window that appears, navigate to the file you want to add.
Select the file, and then click Open to copy the file to your device.The file appears in the iMovie Documents pane when copying is complete.
Open iMovie on your device; if the marquee screen isn’t showing, tap the My Projects button in the upper-left corner above the viewer.
Tap the Import button at the bottom of the screen, and then tap the name of the project you want to import.When the import is complete, the project opens and can be edited like any other project.

I need to read data from a text file and display it in a datagrid.how can this be done..please help

hey ppl
i have a datagrid in my form.i need to read input(fields..sort of a database) from a text file and display its contents in the datagrid.
how can this be done.. and also after every few seconds reading event should be re executed.. and that the contents of the datagrid will keep changing as per the changes in the file...
please help as this is urgent and important.. if possible please provide me with an example code as i am completely new to flex...
thanks.....

It's not possible to read from a file without using classes from the core API*. You'll have to get clarification from your instructor as to which classes are and are not allowed.
[http://java.sun.com/docs/books/tutorial/essential/io/]
*Unless you write a bunch of JNI code to replicate what the java.io classes are doing.

I have ios 4.2.1 on my iphone4, now i want to udate it to 6.1.3 .is it possible? if yes then how? and i don't want to update on ios 7 or later pleaase help me

i have ios 4.2.1 on my iphone4, now i want to udate it to 6.1.3 .is it possible? if yes then how?
and i don't want to update on ios 7 or later
pleaase help me

No you can't. It is iOS 7 or not at all. You need to update to the lastest software or not at all, so the choice is yours. Update to the latest software or not at all. Stick with what you have.
Also stop trolling this forum with the same stupid question to which you have had the same answer time and again.

Adobe Bridge has been deleted and needs to be re-installed. How can this be done without reinstallin

Adobe Bridge has been deleted and needs to be re-installed. How can this be done without reinstalling the entire CS5

Hi RDMDanielM,
Welcome to the Community!
We cannot install Adobe Bridge as a Standalone product, you can just reinstall Photoshop and Bridge will be reinstalled with it. Go ahead and start uninstalling CS5 suite but choose Photoshop from the list and the same will be applicable while Installation.
Thanks!
Ankit

How to disable the previously entered user ID's that automatically appear. For example ; when logging into email , first letter of user ID promts the previously used email user IDs... Want to disable this feature---How can ot be done ?

Question
How to disable the previously entered user ID's that automatically appear. For example ; when logging into email , first letter of user ID prompts the previously used email user IDs... Want to disable this feature---How can it be done ?

*Click the (empty) input field on the web page to open the drop down list
*Highlight an entry in the drop down list
*Press the Delete key (on Mac: Shift+Delete) to remove it.
*http://kb.mozillazine.org/Deleting_autocomplete_entries
* Tools > Options > Security: Passwords: "Saved Passwords" > "Show Passwords"
* Tools > Options > Privacy > History: "Remember search and form history"
* https://support.mozilla.com/kb/Remembering+passwords
* https://support.mozilla.com/kb/Form+autocomplete

I have a the Spring 2011 iMac and I am looking to connect both my Bose Companion 2's with my new Companion 20's together to have one single audio system, any suggestions on how this can be done?

I have a the Spring 2011 iMac and I am looking to connect both my Bose Companion 2's with my new Companion 20's together to have one single audio system, any suggestions on how this can be done?

FIxed my problem!
After years the problem was solved somply!
Go to System preferences
Go to Ethernet
Go to Advance
Go to Hardware
The just make the changes like in the pictures below

Conversion of existing Down Payments - How can this be done.

All - We do not have the Travel or HR modules. We issue advances to employees who are travelling. We issue a down payment request (f-47) and pay this through F110. The advance is cleared when the voucher is processed.
When we created this process we didn't have any travel advances in the system. Now we are converting a new company into SAP that has employee travel advances.
Can anyone advise how to convert these balances into SAP. I do not want to impact cash but need to bring in the balances with the original trip date so we can age the advance. Please advise how this can be done.

You need Acrobat Std or Pro for this
http://www.adobe.com/products/acrobat/editing-pdf-documents.html

I am trying to link to page in my document from the table of contents. How can this be done?

I am trying to link to page in my document from the table of contents. How can this be done?

The Table of Contents picks up selected named Styles in the text like Head 1, 2 etc.
Have you actually applied the styles?
Peter

How to transfer own -done with the iPad- movies from iPad to PC ?

How to transfer own -done with the iPad- movies from iPad to PC ?
The fotos are possible to transfer, but not the movies

Import photos and videos from your iPhone, iPad, or iPod touch to your Mac or Windows PC - Apple Support

I want to import songs frm my Ipod to my itunes library. Songs were ripped from CDs to the ipod not purchased from itunes store...how can this be done?

I want to import songs frm my Ipod to my itunes library. Songs were ripped from CDs to the ipod not purchased from itunes store...how can this be done?

You would have to let itunes rip the songs from the cd's, or you would have to copy the music from the computer which ripped cd's.
iTunes does not support transferring music from the ipod unless it was purchased from the store.

How is barcode recognition done?

Similar Messages

Maybe you are looking for