How to get data from image
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There's a reason why it's noisy and distorted. It's so that you CAN'T use automation to get those characters!
Dave Kreskowiak Microsoft MVP - Visual Basic
Hai Dave, The image is noisy because, the image is a captcha image as you know there will be noise in captcha image.I have captcha images with JPEG extension, i have to remove noise from captcha image and after that i have to extract characters from captcha image. please give reply it would be help full for me......... regards, Balu.
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Hai Dave, The image is noisy because, the image is a captcha image as you know there will be noise in captcha image.I have captcha images with JPEG extension, i have to remove noise from captcha image and after that i have to extract characters from captcha image. please give reply it would be help full for me......... regards, Balu.
What did I just get done telling you?? You CAN'T DO THAT because CAPTCHA was designed specifically to defeat what you're trying to do!
Dave Kreskowiak Microsoft MVP - Visual Basic
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What did I just get done telling you?? You CAN'T DO THAT because CAPTCHA was designed specifically to defeat what you're trying to do!
Dave Kreskowiak Microsoft MVP - Visual Basic
Dave i understood what u have suggested me. ok removing noise is difficult, but give some idea how can i extract data from captcha image.Give reply if u have idea about extracting data from image. Regards, Balu.
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Dave i understood what u have suggested me. ok removing noise is difficult, but give some idea how can i extract data from captcha image.Give reply if u have idea about extracting data from image. Regards, Balu.
What part of "YOU CAN'T DO THAT" don't you understand? The text in those images is deliberatly wavy a filled with noise so that no OCR software can read it. You can't get the text in a CAPTCHA image because there's no technology out there that can read it! That's the whole point behind CAPTCHA!! It's a test to determine if a machine is trying to access a website or if its a human doing it. The machines will always fail this test because there's no way they can make out the text in the image.
Dave Kreskowiak Microsoft MVP - Visual Basic
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Dave i understood what u have suggested me. ok removing noise is difficult, but give some idea how can i extract data from captcha image.Give reply if u have idea about extracting data from image. Regards, Balu.
No, you haven't understood. The whole purpose of captcha images is to ensure that it is a human that is viewing the image. They are specifically designed to make it impossible for any kind of automated tool to extract the data. So, not only is it as impossible as makes no difference, you also can't really have a good reason to be doing it - attempting to bypass security controls is a bad thing.
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What part of "YOU CAN'T DO THAT" don't you understand? The text in those images is deliberatly wavy a filled with noise so that no OCR software can read it. You can't get the text in a CAPTCHA image because there's no technology out there that can read it! That's the whole point behind CAPTCHA!! It's a test to determine if a machine is trying to access a website or if its a human doing it. The machines will always fail this test because there's no way they can make out the text in the image.
Dave Kreskowiak Microsoft MVP - Visual Basic
Dave Kreskowiak wrote:
You can't get the text in a CAPTCHA image because there's no technology out there that can read it!
not yet at least.
Maximilien Lincourt Your Head A Splode - Strong Bad
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Hi, How can we get data or characters which is present on image.Actually i have captcha images in .JPEG extension and from that images i have to remove noise, extract the characters and then i have to convert the extracted characters in to string.So please give some idea how to proceed further.
This article may help :- http://www.cs.sfu.ca/~mori/research/gimpy/[^] It probably won't help you break more advanced captchas though.
Regards, Nish
Nish’s thoughts on MFC, C++/CLI and .NET (my blog)
Currently working on C++/CLI in Action for Manning Publications. (*Sample chapter available online*) -
Hi, How can we get data or characters which is present on image.Actually i have captcha images in .JPEG extension and from that images i have to remove noise, extract the characters and then i have to convert the extracted characters in to string.So please give some idea how to proceed further.
As Dave and Nish have said, CAPTCHAs are explicitly designed to defeat OCR. It may not be totally impossible, you're going to have to do a good amount of research to try and process them. Noone has written a CCaptchaOcrConverter class that you can just copy/paste into your application.
-- CleaKO The sad part about this instance is that none of the users ever said anything [about the problem]. Pete O`Hanlon Doesn't that just tell you everything you need to know about users?
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As Dave and Nish have said, CAPTCHAs are explicitly designed to defeat OCR. It may not be totally impossible, you're going to have to do a good amount of research to try and process them. Noone has written a CCaptchaOcrConverter class that you can just copy/paste into your application.
-- CleaKO The sad part about this instance is that none of the users ever said anything [about the problem]. Pete O`Hanlon Doesn't that just tell you everything you need to know about users?
dan neely wrote:
It may not be totally impossible, you're going to have to do a good amount of research to try and process them.
PS IF you don't even know all the right questions to ask, you're probably not the right person to be doing the actual research either.
-- CleaKO The sad part about this instance is that none of the users ever said anything [about the problem]. Pete O`Hanlon Doesn't that just tell you everything you need to know about users?
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dan neely wrote:
It may not be totally impossible, you're going to have to do a good amount of research to try and process them.
PS IF you don't even know all the right questions to ask, you're probably not the right person to be doing the actual research either.
-- CleaKO The sad part about this instance is that none of the users ever said anything [about the problem]. Pete O`Hanlon Doesn't that just tell you everything you need to know about users?
dan neely wrote:
IF you don't even know all the right questions to ask, you're probably not the right person to be doing the actual research either.
Bingo!
Dave Kreskowiak Microsoft MVP - Visual Basic
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dan neely wrote:
IF you don't even know all the right questions to ask, you're probably not the right person to be doing the actual research either.
Bingo!
Dave Kreskowiak Microsoft MVP - Visual Basic
OMG, this thread has to be the funniest thing I've read for ages. It's brightend my day. Thanks guys!
Regards Wayne Phipps ____________ Time is the greatest teacher... unfortunately, it kills all of its students View my Blog
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What part of "YOU CAN'T DO THAT" don't you understand? The text in those images is deliberatly wavy a filled with noise so that no OCR software can read it. You can't get the text in a CAPTCHA image because there's no technology out there that can read it! That's the whole point behind CAPTCHA!! It's a test to determine if a machine is trying to access a website or if its a human doing it. The machines will always fail this test because there's no way they can make out the text in the image.
Dave Kreskowiak Microsoft MVP - Visual Basic
Dave Kreskowiak wrote:
What part of "YOU CAN'T DO THAT" don't you understand?
I am sorry Dave, I am afraid can't do that. :rolleyes:
"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus "Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe
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Hi, How can we get data or characters which is present on image.Actually i have captcha images in .JPEG extension and from that images i have to remove noise, extract the characters and then i have to convert the extracted characters in to string.So please give some idea how to proceed further.
The black hats did hire recently?
Failure is not an option - it's built right in.
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Dave Kreskowiak wrote:
What part of "YOU CAN'T DO THAT" don't you understand?
I am sorry Dave, I am afraid can't do that. :rolleyes:
"Throughout human history, we have been dependent on machines to survive. Fate, it seems, is not without a sense of irony. " - Morpheus "Real men use mspaint for writing code and notepad for designing graphics." - Anna-Jayne Metcalfe
Hahahaha!!!:laugh::laugh:
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Dave i understood what u have suggested me. ok removing noise is difficult, but give some idea how can i extract data from captcha image.Give reply if u have idea about extracting data from image. Regards, Balu.
JanapatiBalu wrote:
i understood what u have suggested me.
Oh no you haven't!